diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..010ec9d
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,14 @@
+[profile.release]
+opt-level = 'z'
+lto = true
+codegen-units = 1
+
+[unstable]
+build-std = ["core", "alloc"]
+build-std-features = ["compiler-builtins-mem"]
+
+# By default, heap size is enforced to 8192 bytes.
+# Authorized values are [2048, 4096, 8192, 16384, 24576]
+# We use 16k as we get some crashes on 8k when running the tests with big 20+ input TXs
+[env]
+HEAP_SIZE = "16384"
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..dfe0770
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# Auto detect text files and perform LF normalization
+* text=auto
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..5462dbb
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,14 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "cargo" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "daily"
+    allow:
+      - dependency-name: "ledger_device_sdk"
+      - dependency-name: "include_gif"
diff --git a/.github/workflows/build_and_functional_tests.yml b/.github/workflows/build_and_functional_tests.yml
new file mode 100644
index 0000000..3e87c18
--- /dev/null
+++ b/.github/workflows/build_and_functional_tests.yml
@@ -0,0 +1,49 @@
+name: Build and run functional tests using ragger through reusable workflow
+
+# This workflow will build the app and then run functional tests using the Ragger framework upon Speculos emulation.
+# It calls a reusable workflow developed by Ledger's internal developer team to build the application and upload the
+# resulting binaries.
+# It then calls another reusable workflow to run the Ragger tests on the compiled application binary.
+#
+# The build part of this workflow is mandatory, this ensures that the app will be deployable in the Ledger App Store.
+# While the test part of this workflow is optional, having functional testing on your application is mandatory and this workflow and
+# tooling environment is meant to be easy to use and adapt after forking your application
+
+permissions:
+  actions: write
+  contents: write
+  pull-requests: write
+
+on:
+  workflow_dispatch:
+    inputs:
+      golden_run:
+        type: choice
+        required: true
+        default: 'Raise an error (default)'
+        description: CI behavior if the test snaphots are different than expected.
+        options:
+          - 'Raise an error (default)'
+          - 'Open a PR'
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  build_application:
+    name: Build application using the reusable workflow
+    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_build.yml@v1
+    with:
+      upload_app_binaries_artifact: "compiled_app_binaries"
+      builder: ledger-app-builder
+
+  ragger_tests:
+    name: Run ragger tests using the reusable workflow
+    needs: build_application
+    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_ragger_tests.yml@v1
+    with:
+      download_app_binaries_artifact: "compiled_app_binaries"
+      regenerate_snapshots: ${{ inputs.golden_run == 'Open a PR' }}
diff --git a/.github/workflows/coding_style_checks.yml b/.github/workflows/coding_style_checks.yml
new file mode 100644
index 0000000..79c61c4
--- /dev/null
+++ b/.github/workflows/coding_style_checks.yml
@@ -0,0 +1,21 @@
+name: Run coding style check
+
+# This workflow will run linting checks to ensure a level of code quality among all Ledger applications.
+#
+# The presence of this workflow is mandatory as a minimal level of linting is required.
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  check_linting:
+    name: Check linting using the reusable workflow
+    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_lint.yml@v1
+    with:
+      source: './src'
diff --git a/.github/workflows/extra_checks.yml b/.github/workflows/extra_checks.yml
new file mode 100644
index 0000000..2c023e6
--- /dev/null
+++ b/.github/workflows/extra_checks.yml
@@ -0,0 +1,28 @@
+name: Run extra checks
+
+# This workflow will run `run_extra_checks.sh` from the project root.
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  run_extra_checks:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v5
+
+      # Note: no need to install docker manually, because it's already installed, see
+      # https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md
+
+      - name: Run the checks
+        run: |
+          docker run --rm -v "$(realpath .):/app" -w /app \
+            ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest \
+            bash run_extra_checks.sh
diff --git a/.github/workflows/guidelines_enforcer.yml b/.github/workflows/guidelines_enforcer.yml
new file mode 100644
index 0000000..702c05f
--- /dev/null
+++ b/.github/workflows/guidelines_enforcer.yml
@@ -0,0 +1,33 @@
+name: Ensure compliance with Ledger guidelines
+
+# This workflow is mandatory in all applications
+# It calls a reusable workflow guidelines_enforcer developed by Ledger's internal developer team.
+# The successful completion of the reusable workflow is a mandatory step for an app to be available on the Ledger
+# application store.
+#
+# More information on the guidelines can be found in the repository:
+# LedgerHQ/ledger-app-workflows/
+
+permissions:
+  actions: write
+  contents: read
+  pull-requests: write
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  guidelines_enforcer:
+    # TODO: this is disabled because the app is still not in the ledger app database,
+    # so the "Check app_load_params" step fails.
+    # Once it's there, this must be re-enabled.
+    # See https://github.com/mintlayer/mintlayer-ledger-app/issues/20.
+    if: false
+    name: Call Ledger guidelines_enforcer
+    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_guidelines_enforcer.yml@v1
diff --git a/.github/workflows/misspellings_checks.yml b/.github/workflows/misspellings_checks.yml
new file mode 100644
index 0000000..845be36
--- /dev/null
+++ b/.github/workflows/misspellings_checks.yml
@@ -0,0 +1,19 @@
+name: Misspellings checks
+
+# This workflow performs some misspelling checks on the repository
+# It is there to help us maintain a level of quality in our codebase and does not have to be kept on forked
+# applications.
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  misspell:
+    name: Check misspellings
+    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_spell_check.yml@v1
diff --git a/.github/workflows/python_tests_checks.yml b/.github/workflows/python_tests_checks.yml
new file mode 100644
index 0000000..f035629
--- /dev/null
+++ b/.github/workflows/python_tests_checks.yml
@@ -0,0 +1,44 @@
+name: Checks on the Python tests
+
+# This workflow performs some checks on the Python client used by the Boilerplate tests
+# It is there to help us maintain a level of quality in our codebase and does not have to be kept on forked
+# applications.
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+
+  lint:
+    name: Boilerplate client linting
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone
+      uses: actions/checkout@v3
+    - name: Installing PIP dependencies
+      run: |
+        pip install pylint
+        pip install --extra-index-url https://test.pypi.org/simple/ -r tests/requirements.txt
+    - name: Lint Python code
+      run: |
+        pylint --rc tests/setup.cfg tests/application_client/
+
+  mypy:
+    name: Type checking
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone
+      uses: actions/checkout@v3
+    - name: Installing PIP dependencies
+      run: |
+        pip install mypy
+        pip install --extra-index-url https://test.pypi.org/simple/ -r tests/requirements.txt
+    - name: Mypy type checking
+      run: |
+        mypy tests/application_client/
diff --git a/.github/workflows/unit_tests.yml b/.github/workflows/unit_tests.yml
new file mode 100644
index 0000000..fb70e1e
--- /dev/null
+++ b/.github/workflows/unit_tests.yml
@@ -0,0 +1,31 @@
+name: Run unit tests
+
+# This workflow will run `run_unit_tests.sh` from the project root for each device model.
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  run_extra_checks:
+    runs-on: ubuntu-24.04
+    strategy:
+      matrix:
+        model: [nanox, nanosp, stax, flex, apex_p]
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v5
+
+      # Note: no need to install docker manually, because it's already installed, see
+      # https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md
+
+      - name: Run the checks
+        run: |
+          docker run --rm -v "$(realpath .):/app" -w /app \
+            ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest \
+            bash run_unit_tests.sh ${{ matrix.model }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..246e261
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,29 @@
+target
+app.json
+app_nanos.json
+app_nanosplus.json
+app_nanox.json
+app_stax.json
+app_flex.json
+
+# Temporary directory with snapshots taken during test runs
+tests/snapshots-tmp/
+
+.DS_Store
+
+# Python
+*.pyc[cod]
+*.egg
+__pycache__/
+*.egg-info/
+.eggs/
+.python-version
+
+# Related to the Ledger VSCode extension
+# Virtual env for sideload (macOS and Windows)
+ledger/
+# Build directory
+build/
+
+# VSCode
+.vscode/
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..5d07645
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1727 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
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+
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+dependencies = [
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+
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+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
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+
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+ "quote",
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+ "wasm-bindgen-shared",
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+[[package]]
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+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
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+]
+
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+ "syn 2.0.104",
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+[[package]]
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+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+checksum = "73ab332fe2f6680068f3582b16a24f90ad7096d5d39b974d1c0aff0125116f02"
+dependencies = [
+ "simd-adler32",
+]
+
+[[package]]
+name = "zune-jpeg"
+version = "0.4.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29ce2c8a9384ad323cf564b67da86e21d3cfdff87908bc1223ed5c99bc792713"
+dependencies = [
+ "zune-core",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b2ff483
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,85 @@
+[package]
+name = "mintlayer-app"
+version.workspace = true
+edition = "2021"
+
+[workspace]
+members = ["crates/app-core", "crates/messages", "crates/test-utils"]
+resolver = "2"
+
+[workspace.package]
+version = "1.0.0"
+
+[workspace.dependencies]
+bech32 = { version = "0.11", default-features = false }
+chrono = { version = "0.4", default-features = false }
+const-hex = { version = "1.19", default-features = false }
+derive_more = { version = "2.1", default-features = false }
+image = "0.25"
+ledger_device_sdk = "1.35"
+ledger_secure_sdk_sys = "1.16"
+num_enum = { version = "0.7", default-features = false }
+num-traits = { version = "0.2", default-features = false }
+# Note: the testmacro crate is published by Ledger and its source code comes from the `testmacro`
+# dir inside the sdk repo, i.e. https://github.com/LedgerHQ/ledger-device-rust-sdk/tree/cad196841dbd72c037cfa01bec81a4a3ae57a04e/testmacro
+# (though the published version is a bit older).
+testmacro = "0.1"
+
+mintlayer-app-core = { path = "crates/app-core" }
+mintlayer-messages = { path = "crates/messages" }
+test-utils = { path = "crates/test-utils" }
+
+[workspace.dependencies.parity-scale-codec]
+git = "https://github.com/paritytech/parity-scale-codec.git"
+# Use the specific commit "5021525697edc0661591ebc71392c48d950a10b0",
+# which includes a fix for NanoX devices that do not support certain
+# atomic operations.
+#
+# Fix reference: https://github.com/paritytech/parity-scale-codec/pull/751
+# This fix should be included in releases after version 3.7.5.
+rev = "5021525697edc0661591ebc71392c48d950a10b0"
+default-features = false
+
+[workspace.dependencies.mintlayer-core-primitives]
+git = "https://github.com/mintlayer/mintlayer-core-primitives"
+# The commit "Merge pull request #4 from mintlayer/fix_typo".
+rev = "8644bfe06d932d687075939d2d175183ba1c369d"
+package = "mintlayer-core-primitives"
+
+[dependencies]
+ledger_device_sdk.workspace = true
+
+mintlayer-app-core.workspace = true
+
+[build-dependencies]
+image.workspace = true
+
+[[bin]]
+# Note: we only have this section to disable tests, but Cargo insists that "name" should also
+# be specified.
+name = "mintlayer-app"
+# The app bin crate is a thin wrapper around `mintlayer-app-core` and it's not supposed to have
+# unit tests of its own. So we disable tests completely to prevent Cargo from producing an uncompilable
+# test binary.
+test = false
+
+[package.metadata.ledger]
+curve = ["secp256k1"]
+flags = "0"
+path = ["44'/19788'", "44'/1'"]
+name = "Mintlayer"
+
+[package.metadata.ledger.nanox]
+icon = "media/icons/mintlayer_14x14.gif"
+
+[package.metadata.ledger.nanosplus]
+icon = "media/icons/mintlayer_14x14.gif"
+
+[package.metadata.ledger.stax]
+icon = "media/icons/mintlayer_32x32.gif"
+
+[package.metadata.ledger.flex]
+icon = "media/icons/mintlayer_40x40.gif"
+
+[package.metadata.ledger.apex_p]
+icon = "media/icons/mintlayer_32x32.png"
diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index 65bdee8..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2025 Mintlayer
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 0000000..8dada3e
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
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+      "Legal Entity" shall mean the union of the acting entity and all
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+      direction or management of such entity, whether by contract or
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+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+      "Source" form shall mean the preferred form for making modifications,
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+      "Work" shall mean the work of authorship, whether in Source or
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+      "Contribution" shall mean any work of authorship, including
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
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+      You may add Your own copyright statement to Your modifications and
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+      the conditions stated in this License.
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
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+   7. Disclaimer of Warranty. Unless required by applicable law or
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+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
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+      negligent acts) or agreed to in writing, shall any Contributor be
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+   APPENDIX: How to apply the Apache License to your work.
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+       http://www.apache.org/licenses/LICENSE-2.0
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+   Unless required by applicable law or agreed to in writing, software
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+   See the License for the specific language governing permissions and
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9878636
--- /dev/null
+++ b/README.md
@@ -0,0 +1,185 @@
+# Ledger Rust Mintlayer Application
+
+![Rule enforcer](https://github.com/mintlayer/mintlayer-ledger-app/actions/workflows/guidelines_enforcer.yml/badge.svg) ![Build and tests](https://github.com/mintlayer/mintlayer-ledger-app/actions/workflows/build_and_functional_tests.yml/badge.svg)
+
+This is the Mintlayer Ledger application for the Ledger Nano X, Nano S+, Stax, Flex and Nano Gen 5 devices.
+
+ℹ️ Nano Gen 5 is usually referred to by its codename, Apex P.
+
+⚠️ Nano S is not supported.
+
+## Quick start guide
+
+### With VS Code
+
+You can quickly set up a development environment on any platform (macOS, Linux or Windows) to build and test your application with [Ledger's VS Code extension](https://marketplace.visualstudio.com/items?itemName=LedgerHQ.ledger-dev-tools).
+
+By using Ledger's own developer tools [Docker image](https://github.com/LedgerHQ/ledger-app-builder/pkgs/container/ledger-app-builder%2Fledger-app-dev-tools), the extension allows you to **build** your apps with the latest SDK, **test** them on **Speculos** and **load** them on any supported device.
+
+- Install and run [Docker](https://www.docker.com/products/docker-desktop/).
+- Make sure you have an X11 server running :
+  - On Ubuntu Linux, it should be running by default.
+  - On macOS, install and launch [XQuartz](https://www.xquartz.org/) (make sure to go to XQuartz > Preferences > Security and check "Allow client connections").
+  - On Windows, install and launch [VcXsrv](https://sourceforge.net/projects/vcxsrv/) (make sure to configure it to disable access control).
+- Install [VS Code](https://code.visualstudio.com/download) and add [Ledger's extension](https://marketplace.visualstudio.com/items?itemName=LedgerHQ.ledger-dev-tools).
+- Open a terminal and clone `mintlayer-ledger-app` with `git clone git@github.com:mintlayer/mintlayer-ledger-app.git`.
+- Open the `mintlayer-ledger-app` folder with VS Code.
+- Use Ledger extension's sidebar menu or open the tasks menu with `ctrl + shift + b` (`command + shift + b` on a Mac) to conveniently execute actions :
+  - **Build** the app for the device model of your choice with `Build`.
+  - **Test** your binary on the [Speculos emulator](https://github.com/LedgerHQ/speculos) with `Run with emulator`.
+  - You can also **run functional tests**, load the app on a physical device, and more.
+
+ℹ️ The terminal tab of VS Code will show you what commands the extension runs behind the scene.
+
+## With a terminal
+
+### Prerequisites
+
+If you do not wish to use the [VS Code extension](#with-vs-code), you can follow the following steps to set up a development environment on Linux, Windows or macOS.
+
+- The [ledger-app-dev-tools](https://github.com/LedgerHQ/ledger-app-builder/pkgs/container/ledger-app-builder%2Fledger-app-dev-tools) Docker image contains all the required tools and libraries to build, test and load an application on a device. You can download it from the ghcr.io docker repository:
+
+  ```bash
+  docker pull ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest
+  ```
+
+- Make sure you have an X11 server running :
+  - On Ubuntu Linux, it should be running by default.
+  - On macOS, install and launch [XQuartz](https://www.xquartz.org/) (make sure to go to XQuartz > Preferences > Security and check "Allow client connections").
+  - On Windows, install and launch [VcXsrv](https://sourceforge.net/projects/vcxsrv/) (make sure to configure it to disable access control).
+- You can then enter into this development environment by executing the following command from the directory of the application (`git` repository):
+  - Linux (Ubuntu):
+    ```bash
+    docker run --user "$(id -u)":"$(id -g)" --rm -ti --privileged -v "/dev/bus/usb:/dev/bus/usb" -v "$(realpath .):/app" --publish 5000:5000 --publish 9999:9999 -e DISPLAY=$DISPLAY -v '/tmp/.X11-unix:/tmp/.X11-unix' ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest
+    ```
+  - macOS:
+    ```bash
+    docker run --user "$(id -u)":"$(id -g)" --rm -ti --privileged -v "$(pwd -P):/app" --publish 5000:5000 --publish 9999:9999 -e DISPLAY='host.docker.internal:0' -v '/tmp/.X11-unix:/tmp/.X11-unix' ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest
+    ```
+  - Windows (with PowerShell):
+    ```bash
+    docker run --rm -ti --privileged -v "$(Get-Location):/app" -e DISPLAY='host.docker.internal:0' --publish 5000:5000 --publish 9999:9999 ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest
+    ```
+
+The application's code will be available from inside the docker container, you can proceed to the following compilation steps to build your app.
+
+### Building
+
+You can build the Mintlayer app with the following command executed in the root directory of the app.
+
+```bash
+cargo ledger build nanox
+```
+
+This command will build the app for the Nano X, but you can use any supported device (`nanox`, `nanosplus`, `stax`, `flex`, `apex_p`).
+
+### Testing
+
+#### Ragger functional tests
+
+This Mintlayer app comes with functional tests implemented with Ledger's [Ragger](https://github.com/LedgerHQ/ragger) test framework.
+
+- Install the tests requirements
+
+  ```bash
+  pip install -r tests/requirements.txt
+  ```
+
+- Run the functional tests :
+
+  ```bash
+  pytest tests/ --tb=short -v --device {nanosp | nanox | stax | flex | apex_p}
+  ```
+
+ℹ️ Speculos uses `nanosp` for Nano S+ (whereas `ledger_app.toml` lists it as `nanos+`).
+
+#### Emulator
+
+You can also run the app directly on the [Speculos emulator](https://github.com/LedgerHQ/speculos) from the Docker container
+
+#### Nano S+ or X
+
+```bash
+speculos --apdu-port 9999 --api-port 5000 --display headless --model nanosp target/nanosplus/release/mintlayer-app
+```
+
+⚠️ UI is displayed on `localhost:5000`.
+
+#### Stax, Flex or Nano Gen 5
+
+```bash
+speculos --apdu-port 9999 --api-port 5000 --model stax target/stax/release/mintlayer-app
+```
+
+⚠️ UI is displayed by your X server.
+
+You can then send APDU using `ledgercomm` (`pip install ledgercomm`):
+
+```
+ledgercomm-send file test.apdu
+```
+
+ℹ️ You can also specify the seed phrase via `-s`, e.g.: `-s "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"`.
+
+### Loading on device
+
+On Linux, loading the application on a device can be done inside the docker container via:
+
+```bash
+cargo ledger build nanox --load
+```
+(the `--privileged -v "/dev/bus/usb:/dev/bus/usb"` part of the Docker run command line allows this).
+
+It can also be done outside the docker container on all platforms via [ledgerblue](https://pypi.org/project/ledgerblue/):
+
+* Install `ledgerblue`:
+  ```bash
+  pip install ledgerblue
+  ```
+
+* Build the app inside the docker container as usual.
+
+* Load the app on device, e.g. for Flex:
+  ```bash
+  python -m ledgerblue.runScript --targetId <id> --fileName target/flex/release/mintlayer-app.apdu --apdu --scp
+  ```
+
+ℹ️ Your device must be connected, unlocked and the screen showing the dashboard (not inside an application).
+
+#### About the device target ID
+
+ledgerblue needs the device's `targetId`.
+
+If you call ledgerblue manually, note that its `--targetId` defaults to `0x31100002` (Nano S) — wrong for every other device,
+and it is **not** auto-detected from the connected device.
+The cleanest option is to let ledgerblue read the id straight from the ELF with `--elfFile`, which overrides `--targetId`:
+
+```bash
+python -m ledgerblue.runScript --elfFile target/flex/release/mintlayer-app --fileName target/flex/release/mintlayer-app.apdu --apdu --scp
+```
+
+If you instead need the raw target ID value (e.g. for a CI script), the [`tools/get_target_id.py`](tools/get_target_id.py)
+helper extracts it from the `ledger.target_id` ELF section:
+```bash
+python tools/get_target_id.py target/flex/release/mintlayer-app   # -> 0x33300004
+```
+
+## Continuous Integration
+
+The following workflows are executed in [GitHub Actions](https://github.com/features/actions) :
+
+- Ledger guidelines enforcer which verifies that an app is compliant with Ledger guidelines. The successful completion of this reusable workflow is a mandatory step for an app to be available on the Ledger application store. More information on the guidelines can be found in the repository [ledger-app-workflow](https://github.com/LedgerHQ/ledger-app-workflows).
+- Compilation of the application for all supported devices in the [ledger-app-builder](https://github.com/LedgerHQ/ledger-app-builder) docker image.
+- End-to-end tests with the [Speculos](https://github.com/LedgerHQ/speculos) emulator and [ragger](https://github.com/LedgerHQ/ragger) (see [tests/](tests/)).
+- Various lint checks performed by Ledger's reusable workflows:
+  - Source code lint checks with `cargo fmt`.
+  - Python functional test code lint checks with `pylint` and `mypy`.
+- Additional custom checks, run via `run_extra_checks.sh`.
+- Unit tests, run via `run_unit_tests.sh`.
+
+## Additional documentation
+
+For the additional documentation, see the [docs](docs/) folder.
+
+- [docs/memory_usage.md](docs/memory_usage.md) - guidelines related to the app's memory usage.
+- [docs/technical_specification.md](docs/technical_specification.md) - app's technical specification.
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..0b997fb
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,75 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2023 Ledger SAS.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use std::process::Command;
+
+use image::{ImageFormat, ImageReader, Pixel};
+
+// TODO: all image files currently contain the Rust logo; need to replace them with Mintlayer logo.
+// See https://github.com/mintlayer/mintlayer-ledger-app/issues/10.
+
+fn main() {
+    println!("cargo:rerun-if-changed=script.ld");
+    println!("cargo:rerun-if-changed=media/icons/mintlayer_14x14.gif");
+    println!("cargo:rerun-if-changed=media/icons/mask_14x14.gif");
+
+    let icons_path = std::path::PathBuf::from("media/icons");
+    let mut gray = ImageReader::open(icons_path.join("mintlayer_14x14.gif"))
+        .unwrap()
+        .decode()
+        .unwrap()
+        .into_luma8();
+
+    // Apply mask
+    let mask = ImageReader::open(icons_path.join("mask_14x14.gif"))
+        .unwrap()
+        .decode()
+        .unwrap()
+        .into_luma8();
+
+    for (x, y, mask_pixel) in mask.enumerate_pixels() {
+        let mask_value = mask_pixel[0];
+        let mut gray_pixel = *gray.get_pixel(x, y);
+        if mask_value == 0 {
+            gray_pixel = image::Luma([0]);
+        } else {
+            gray_pixel.invert();
+        }
+        gray.put_pixel(x, y, gray_pixel);
+    }
+
+    let glyph_path = std::path::PathBuf::from("media/glyphs");
+    gray.save_with_format(glyph_path.join("home_nano_nbgl.png"), ImageFormat::Png)
+        .unwrap();
+
+    let output = Command::new("git")
+        .args(["rev-parse", "HEAD"])
+        .output()
+        .expect("Failed to execute git command");
+
+    let git_hash = String::from_utf8(output.stdout).expect("Failed to convert git output to UTF-8");
+
+    // Expose the Git hash as an environment variable
+    // TODO: this is unused. Either implement a custom command that would return this info
+    // (e.g. in the form of a full semantic version), or remove this.
+    // See https://github.com/mintlayer/mintlayer-ledger-app/issues/11.
+    println!("cargo:rustc-env=GIT_HASH={}", git_hash.trim());
+
+    // Rerun the build script if .git/HEAD changes
+    println!("cargo:rerun-if-changed=.git/HEAD");
+}
diff --git a/clippy.toml b/clippy.toml
new file mode 100644
index 0000000..8feef8a
--- /dev/null
+++ b/clippy.toml
@@ -0,0 +1,3 @@
+# Clippy will complain if objects smaller that this are boxed.
+# The default is 200 and we sometimes box slightly smaller objects.
+too-large-for-stack = 150
diff --git a/crates/app-core/Cargo.toml b/crates/app-core/Cargo.toml
new file mode 100644
index 0000000..44b98f2
--- /dev/null
+++ b/crates/app-core/Cargo.toml
@@ -0,0 +1,27 @@
+[package]
+name = "mintlayer-app-core"
+version.workspace = true
+edition = "2024"
+
+[dependencies]
+bech32 = { workspace = true, default-features = false, features = ["alloc"] }
+chrono = { workspace = true, default-features = false, features = ["alloc"] }
+const-hex = { workspace = true, default-features = false, features = ["alloc"] }
+ledger_device_sdk.workspace = true
+ledger_secure_sdk_sys.workspace = true
+
+mintlayer-core-primitives.workspace = true
+
+mintlayer-messages.workspace = true
+
+[dev-dependencies]
+test-utils.workspace = true
+
+[features]
+default = ["ledger_device_sdk/nano_nbgl"]
+debug = ["ledger_device_sdk/debug"]
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = [
+    'cfg(target_os, values("apex_p", "stax", "flex", "nanos", "nanox", "nanosplus"))',
+] }
diff --git a/crates/app-core/src/app_ui/address.rs b/crates/app-core/src/app_ui/address.rs
new file mode 100644
index 0000000..2eb2577
--- /dev/null
+++ b/crates/app-core/src/app_ui/address.rs
@@ -0,0 +1,48 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2023 Ledger SAS.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use ledger_device_sdk::{
+    ecc::ECPublicKey,
+    nbgl::{NbglAddressReview, NbglGlyph},
+};
+
+use mintlayer_messages::{Destination, PublicKey};
+
+use crate::{
+    StatusWord,
+    app_ui::utils::{compress_public_key, load_glyph, to_address},
+    mlcp,
+};
+
+pub fn ui_display_pk<const T: char>(
+    public_key: &ECPublicKey<65, T>,
+    coin_type: mlcp::CoinType,
+) -> Result<bool, StatusWord> {
+    let pk = compress_public_key(public_key)?;
+
+    let dest = Destination::PublicKey(PublicKey::Secp256k1Schnorr(pk));
+    let addr = to_address(&dest, coin_type)?;
+
+    const MINTLAYER: NbglGlyph = load_glyph();
+
+    // Display the address confirmation screen.
+    Ok(NbglAddressReview::new()
+        .glyph(&MINTLAYER)
+        .review_title("Verify ML address")
+        .show(&addr))
+}
diff --git a/crates/app-core/src/app_ui/menu.rs b/crates/app-core/src/app_ui/menu.rs
new file mode 100644
index 0000000..783f649
--- /dev/null
+++ b/crates/app-core/src/app_ui/menu.rs
@@ -0,0 +1,32 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2023 Ledger SAS.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use ledger_device_sdk::nbgl::{NbglGlyph, NbglHomeAndSettings};
+
+use crate::app_ui::utils::load_glyph;
+
+pub fn ui_menu_main() -> NbglHomeAndSettings {
+    const MINTLAYER: NbglGlyph = load_glyph();
+
+    // Display the home screen.
+    NbglHomeAndSettings::new().glyph(&MINTLAYER).infos(
+        "Mintlayer",
+        env!("CARGO_PKG_VERSION"),
+        env!("CARGO_PKG_AUTHORS"),
+    )
+}
diff --git a/crates/app-core/src/app_ui/mod.rs b/crates/app-core/src/app_ui/mod.rs
new file mode 100644
index 0000000..3763f0a
--- /dev/null
+++ b/crates/app-core/src/app_ui/mod.rs
@@ -0,0 +1,21 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+pub mod address;
+pub mod menu;
+pub mod sign;
+pub mod utils;
diff --git a/crates/app-core/src/app_ui/sign.rs b/crates/app-core/src/app_ui/sign.rs
new file mode 100644
index 0000000..633efdb
--- /dev/null
+++ b/crates/app-core/src/app_ui/sign.rs
@@ -0,0 +1,658 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use alloc::{format, string::String, string::ToString};
+use chrono::{TimeZone, Utc};
+use core::fmt::Write;
+
+use ledger_device_sdk::{
+    ecc::ECPublicKey,
+    nbgl::{
+        Field, NbglGlyph, NbglReview, NbglStreamingReview, NbglStreamingReviewStatus,
+        TransactionType,
+    },
+};
+
+use mintlayer_messages::{
+    AccountCommand, AccountSpending, AddrType, Amount, DelegationId, Destination, H256,
+    IsTokenFreezable, IsTokenUnfreezable, NftIssuance, OrderAccountCommand, OrderId,
+    OutputTimeLock, OutputValue, PoolId, PublicKey, TokenId, TokenIssuance, TokenTotalSupply,
+    TxOutput, VrfPublicKey, encode,
+};
+
+use crate::{
+    StatusWord,
+    app_ui::utils::{
+        bech32m_encode, compress_public_key, load_glyph, to_address, to_public_key_hash,
+    },
+    handlers::sign_tx::{CoinOrTokenId, InputCommand, TxSummaryCollector, TxType},
+    mlcp,
+    utils::{make_displayable, make_displayable_str, output_value_with_amount},
+};
+
+struct FormattedOutput {
+    name: &'static str,
+    value: String,
+}
+
+pub fn ui_new_streaming_review() -> NbglStreamingReview {
+    const MINTLAYER: NbglGlyph = load_glyph();
+
+    NbglStreamingReview::new()
+        .glyph(&MINTLAYER)
+        .tx_type(TransactionType::Transaction)
+}
+
+pub fn ui_start_streaming_review(review: &NbglStreamingReview) -> bool {
+    review.start("Review transaction", None)
+}
+
+pub fn ui_streaming_review_show_input(
+    review: &NbglStreamingReview,
+    input: &InputCommand,
+    coin: mlcp::CoinType,
+) -> Result<bool, StatusWord> {
+    let input = format_input(input, coin)?;
+
+    let fields = [Field {
+        name: input.name,
+        value: &input.value,
+    }];
+
+    let res = match review.next(&fields) {
+        NbglStreamingReviewStatus::Rejected => false,
+        NbglStreamingReviewStatus::Next | NbglStreamingReviewStatus::Skipped => true,
+    };
+
+    Ok(res)
+}
+
+pub fn ui_streaming_review_show_output(
+    review: &NbglStreamingReview,
+    output: &TxOutput,
+    coin: mlcp::CoinType,
+) -> Result<bool, StatusWord> {
+    let output = format_output(output, coin)?;
+
+    let fields = [Field {
+        name: output.name,
+        value: &output.value,
+    }];
+
+    let res = match review.next(&fields) {
+        NbglStreamingReviewStatus::Rejected => false,
+        NbglStreamingReviewStatus::Next | NbglStreamingReviewStatus::Skipped => true,
+    };
+
+    Ok(res)
+}
+
+pub fn ui_approve_streaming_review(
+    review: &NbglStreamingReview,
+    tx_summary: &TxSummaryCollector,
+    coin: mlcp::CoinType,
+) -> Result<bool, StatusWord> {
+    let fees = tx_summary.fees_iter().try_fold(
+        String::new(),
+        |mut acc, res| -> Result<_, StatusWord> {
+            let (coin_or_token, fee) = res?;
+
+            match coin_or_token {
+                CoinOrTokenId::Coin => writeln!(
+                    acc,
+                    "{}",
+                    format_coin_amount_with_name(Amount::from_atoms(fee), coin),
+                )
+                .map_err(|_| StatusWord::TxDisplayFail)?,
+
+                CoinOrTokenId::TokenId(token_id) => {
+                    if fee != 0 {
+                        writeln!(
+                            acc,
+                            "{}",
+                            format_token_amount_with_name(token_id, Amount::from_atoms(fee), coin)?,
+                        )
+                        .map_err(|_| StatusWord::TxDisplayFail)?;
+                    }
+                }
+            };
+
+            Ok(acc)
+        },
+    )?;
+
+    let fields = [Field {
+        name: "Fees:",
+        value: &fees,
+    }];
+
+    match review.next(&fields) {
+        NbglStreamingReviewStatus::Rejected => return Ok(false),
+        NbglStreamingReviewStatus::Next | NbglStreamingReviewStatus::Skipped => {}
+    };
+
+    let title = transaction_title(&tx_summary.tx_type());
+    Ok(review.finish(title))
+}
+
+fn transaction_title(tx_type: &Option<TxType>) -> &'static str {
+    match tx_type {
+        None | Some(TxType::ComplexTransaction) => "Sign transaction",
+        Some(TxType::Transfer) => "Sign transfer transaction",
+        Some(TxType::Burn) => "Sign burn transaction",
+        Some(TxType::Htlc) => "Sign create HTLC transaction",
+        Some(TxType::CreateDelegation) => "Sign create delegation transaction",
+        Some(TxType::DelegateStaking) => "Sign delegate staking transaction",
+        Some(TxType::DelegationWithdrawal) => "Sign delegation withdrawal transaction",
+        Some(TxType::CreateStakePool) => "Sign create stake pool transaction",
+        Some(TxType::DecommissionStakePool) => "Sign decommission stake pool transaction",
+        Some(TxType::CreateNft) => "Sign create NFT transaction",
+        Some(TxType::CreateToken) => "Sign create token transaction",
+        Some(TxType::MintTokens) => "Sign mint tokens transaction",
+        Some(TxType::UnmintTokens) => "Sign unmint tokens transaction",
+        Some(TxType::FreezeToken) => "Sign freeze tokens transaction",
+        Some(TxType::UnfreezeToken) => "Sign unfreeze tokens transaction",
+        Some(TxType::LockTokenSupply) => "Sign lock token supply transaction",
+        Some(TxType::ChangeTokenAuthority) => "Sign change token authority transaction",
+        Some(TxType::ChangeTokenMetadataUri) => "Sign change token metadata URI transaction",
+        Some(TxType::CreateOrder) => "Sign create order transaction",
+        Some(TxType::FillOrder) => "Sign fill order transaction",
+        Some(TxType::FreezeOrder) => "Sign freeze order transaction",
+        Some(TxType::ConcludeOrder) => "Sign conclude order transaction",
+        Some(TxType::DataDeposit) => "Sign data deposit transaction",
+    }
+}
+
+/// Displays a message for review and signing confirmation on the device.
+///
+/// This function handles both printable text and raw binary data by
+/// displaying UTF-8 content directly and falling back to hex encoding for other data.
+///
+/// # Arguments
+///
+/// * `message`    - The message to be signed.
+/// * `public_key` - The public key corresponding to the private key that will be used for signing.
+/// * `coin_type`  - The coin type (mainnet, testnet etc).
+/// * `addr_type`  - The address type (pk or pkh); this determines how `public_key` will be displayed.
+///
+/// # Returns
+///
+/// * `Ok(true)` if the user approves the signing.
+/// * `Ok(false)` if the user rejects.
+/// * `Err(StatusWord)` on error.
+pub fn ui_display_message<const T: char>(
+    message: &[u8],
+    public_key: &ECPublicKey<65, T>,
+    coin_type: mlcp::CoinType,
+    addr_type: AddrType,
+) -> Result<bool, StatusWord> {
+    let pk = compress_public_key(public_key)?;
+
+    let dest = match addr_type {
+        AddrType::PublicKey => Destination::PublicKey(PublicKey::Secp256k1Schnorr(pk)),
+        AddrType::PublicKeyHash => Destination::PublicKeyHash(to_public_key_hash(&pk)?),
+    };
+    let addr = to_address(&dest, coin_type)?;
+
+    let message_str = make_displayable_str(message);
+
+    let msg_fields = [
+        Field {
+            name: "Address",
+            value: addr.as_str(),
+        },
+        Field {
+            name: "Message",
+            value: &message_str,
+        },
+    ];
+
+    const MINTLAYER: NbglGlyph = load_glyph();
+
+    // Create the NBGL review flow with titles appropriate for message signing.
+    let review: NbglReview = NbglReview::new()
+        .titles(
+            // Title
+            "Review message",
+            // Subtitle; if non-empty, this will be shown on the second screen on nano devices
+            // and below the title on the first screen on touch devices.
+            "",
+            // Final confirmation prompt
+            "Sign message",
+        )
+        .tx_type(TransactionType::Message)
+        .glyph(&MINTLAYER);
+
+    // Show the review screen with the defined fields and return the user's choice.
+    Ok(review.show(&msg_fields))
+}
+
+fn vrf_to_address(key: &VrfPublicKey, coin: mlcp::CoinType) -> Result<String, StatusWord> {
+    bech32m_encode(coin.vrf_public_key_address_prefix(), &encode(key))
+}
+
+fn id_to_address(id: &H256, hrp: &str) -> Result<String, StatusWord> {
+    bech32m_encode(hrp, &id.0)
+}
+
+fn token_id_to_address(id: &TokenId, coin: mlcp::CoinType) -> Result<String, StatusWord> {
+    id_to_address(id.hash(), coin.token_id_address_prefix())
+}
+
+fn pool_id_to_address(id: &PoolId, coin: mlcp::CoinType) -> Result<String, StatusWord> {
+    id_to_address(id.hash(), coin.pool_id_address_prefix())
+}
+
+fn delegation_id_to_address(id: &DelegationId, coin: mlcp::CoinType) -> Result<String, StatusWord> {
+    id_to_address(id.hash(), coin.delegation_id_address_prefix())
+}
+
+fn order_id_to_address(id: &OrderId, coin: mlcp::CoinType) -> Result<String, StatusWord> {
+    id_to_address(id.hash(), coin.order_id_address_prefix())
+}
+
+/// Format a coin amount as a decimal string.
+fn format_coin_amount(amount: Amount, coin: mlcp::CoinType) -> String {
+    let decimals = coin.coin_decimals() as usize;
+    let mantissa = amount.into_atoms();
+
+    // ceil(log10(u128::MAX)) + 1 for decimal point = 40
+    // This is not the maximum possible length, but a reasonable expectation of it.
+    let mut buffer = String::with_capacity(40);
+    write!(&mut buffer, "{mantissa:0>width$}", width = decimals + 1).unwrap();
+    buffer.insert(buffer.len() - decimals, '.');
+    buffer
+}
+
+/// Same as format_coin_amount, but also append the coin ticker to the amount.
+fn format_coin_amount_with_name(amount: Amount, coin: mlcp::CoinType) -> String {
+    let mut amount = format_coin_amount(amount, coin);
+    amount.push(' ');
+    amount.push_str(coin.coin_ticker());
+    amount
+}
+
+fn format_token_amount_with_name(
+    token_id: &TokenId,
+    amount: Amount,
+    coin: mlcp::CoinType,
+) -> Result<String, StatusWord> {
+    let atoms = amount.into_atoms();
+    let id_str = id_to_address(token_id.hash(), coin.token_id_address_prefix())?;
+
+    Ok(format!("{atoms} atoms of {id_str}"))
+}
+
+fn format_atoms(amount: Amount) -> String {
+    format!("{} atoms", amount.into_atoms())
+}
+
+fn format_value(value: &OutputValue, coin: mlcp::CoinType) -> Result<String, StatusWord> {
+    match value {
+        OutputValue::Coin(amount) => Ok(format_coin_amount_with_name(*amount, coin)),
+        OutputValue::TokenV1(token_id, amount) => {
+            format_token_amount_with_name(token_id, *amount, coin)
+        }
+    }
+}
+
+fn format_timestamp(seconds_u64: u64) -> Result<String, StatusWord> {
+    let seconds_i64: i64 = seconds_u64
+        .try_into()
+        .map_err(|_| StatusWord::TxLockTimeInvalid)?;
+    let datetime = Utc
+        .timestamp_opt(seconds_i64, 0)
+        .earliest()
+        .ok_or(StatusWord::TxLockTimeInvalid)?;
+
+    Ok(datetime.format("%Y-%m-%d %H:%M:%S").to_string())
+}
+
+fn format_lock(lock: &OutputTimeLock) -> Result<String, StatusWord> {
+    let s = match lock {
+        OutputTimeLock::UntilHeight(h) => format!("Lock until block height {}", h.0),
+        OutputTimeLock::UntilTime(t) => format!("Lock until {}", format_timestamp(t.0.0)?),
+        OutputTimeLock::ForBlockCount(b) => format!("Lock for {} blocks", b.0),
+        OutputTimeLock::ForSeconds(s) => format!("Lock for {} seconds", s.0),
+    };
+    Ok(s)
+}
+
+/// Formats a transaction output into a FormattedOutput.
+///
+/// # Arguments
+/// * `output` - A reference to the `TxOutput` enum variant to format.
+/// * `coin` - The coin type (mainnet, testnet etc).
+///
+/// # Returns
+/// A FormattedOutput containing the title and value of the output.
+fn format_output(output: &TxOutput, coin: mlcp::CoinType) -> Result<FormattedOutput, StatusWord> {
+    // Note: on nanox and nanosp the screen space is very limited. Moreover, if the name part of
+    // a field doesn't fit into one line, it will be shrunk instead of being wrapped to the next
+    // line, which will make it incomprehensible.
+    // The limit is about 11-12 characters (e.g. "Chg token auth" is already too long and becomes
+    // "Chg to...th").
+    // So, choose names carefully and always check the screen snapshots after they're regenerated.
+    // Same for inputs.
+
+    let (name, value) = match output {
+        TxOutput::Transfer(value, destination) => (
+            "Transfer",
+            format!(
+                "Destination: {}\n{}\n",
+                to_address(destination, coin)?,
+                format_value(value, coin)?
+            ),
+        ),
+
+        TxOutput::LockThenTransfer(value, destination, lock) => {
+            let address_short = format!(
+                "Destination: {}\n{}\n{}\n",
+                to_address(destination, coin)?,
+                format_lock(lock)?,
+                format_value(value, coin)?
+            );
+            if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                ("LockThenXfer", address_short)
+            } else {
+                ("Lock then Transfer", address_short)
+            }
+        }
+
+        TxOutput::Burn(value) => ("Burn", format_value(value, coin)?),
+
+        TxOutput::CreateStakePool(pool_id, data) => {
+            let address_short = format!(
+                "Pool ID: {}\nStaker key: {}\nDecommission key: {}\nVRF public key: {}\nMargin ratio per thousand: {}\nCost per block: {}\nPledge: {}\n",
+                pool_id_to_address(pool_id, coin)?,
+                to_address(&data.staker, coin)?,
+                to_address(&data.decommission_key, coin)?,
+                vrf_to_address(&data.vrf_public_key, coin)?,
+                data.margin_ratio_per_thousand.0,
+                format_coin_amount_with_name(data.cost_per_block, coin),
+                format_coin_amount_with_name(data.pledge, coin)
+            );
+
+            let name = if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                "Create pool"
+            } else {
+                "Create staking pool"
+            };
+            (name, address_short)
+        }
+
+        TxOutput::ProduceBlockFromStake(destination, _pool_id) => {
+            let name = if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                "Prod block"
+            } else {
+                "Produce block from stake"
+            };
+
+            (
+                name,
+                format!("New staker key: {}", to_address(destination, coin)?),
+            )
+        }
+        TxOutput::CreateDelegationId(destination, pool_id) => {
+            let address_short = format!(
+                "Address: {}\nPoolId: {}",
+                to_address(destination, coin)?,
+                pool_id_to_address(pool_id, coin)?
+            );
+
+            let name = if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                "Create deleg"
+            } else {
+                "Create delegation"
+            };
+
+            (name, address_short)
+        }
+
+        TxOutput::DelegateStaking(amount, delegation_id) => {
+            let name = if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                "Deleg stake"
+            } else {
+                "Delegate staking"
+            };
+
+            (
+                name,
+                format!(
+                    "\n{}\n{}",
+                    delegation_id_to_address(delegation_id, coin)?,
+                    format_value(&OutputValue::Coin(*amount), coin)?,
+                ),
+            )
+        }
+        TxOutput::IssueFungibleToken(x) => {
+            let TokenIssuance::V1(data) = x;
+
+            // Note: currently the consensus rules require that a token ticker can only be
+            // ascii alphanumeric, so we could just reject non-ascii tickers here.
+            // We use `make_displayable` here for simplicity and consistency.
+            let ticker = make_displayable(&data.token_ticker);
+            // Note: a metadata URI is allowed to have non-ascii chars, so `make_displayable`
+            // is not redundant here.
+            let metadata_uri = make_displayable(&data.metadata_uri);
+
+            let total_supply_str = match data.total_supply {
+                TokenTotalSupply::Unlimited => "UNLIMITED".to_string(),
+                TokenTotalSupply::Lockable => "LOCKABLE".to_string(),
+                TokenTotalSupply::Fixed(amount) => {
+                    let formatted_amount = format_atoms(amount);
+                    format!("FIXED {}", formatted_amount)
+                }
+            };
+            let is_freezable = match data.is_freezable {
+                IsTokenFreezable::Yes => "Yes",
+                IsTokenFreezable::No => "No",
+            };
+
+            let address_short = format!(
+                "Ticker: {}\nAuthority: {}\nMetadata URI: {}\nTotal token supply: {}\nNumber of decimals: {}\nIs freezable: {}",
+                ticker,
+                to_address(&data.authority, coin)?,
+                metadata_uri,
+                total_supply_str,
+                data.number_of_decimals,
+                is_freezable
+            );
+            let name = if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                "Issue token"
+            } else {
+                "Issue fungible token"
+            };
+
+            (name, address_short)
+        }
+
+        TxOutput::IssueNft(_nft_id, data, destination) => {
+            let NftIssuance::V0(data) = data;
+            // Note:
+            // 1. Consensus rules require that name, description and ticker are ascii alphanumeric.
+            //    But same as in the IssueFungibleToken case, we use `make_displayable` for consistency
+            //    and simplicity.
+            // 2. The URIs are allowed to have non-ascii chars, so `make_displayable` is not redundant
+            //    for them.
+            // 3. There is no point in reviewing the NFT id - consensus rules require that the id is
+            //    calculated from transaction inputs and if the host cheats or malfunctions, the
+            //    transaction will become invalid (note that the id is only present in the output due
+            //    to historical reasons and e.g. IssueFungibleToken doesn't contain the token id).
+            let address_short = format!(
+                "Name: {}\nDescription: {}\nCreator: {}\nTicker: {}\nAddress: {}\nIcon URI: {}\nAdditional metadata URI: {}\nMedia URI: {}, Media hash: {}",
+                make_displayable(&data.name),
+                make_displayable(&data.description),
+                data.creator
+                    .clone()
+                    .map(|creator| to_address(&Destination::PublicKey(creator), coin))
+                    .transpose()?
+                    .unwrap_or_default(),
+                make_displayable(&data.ticker),
+                to_address(destination, coin)?,
+                make_displayable(&data.icon_uri),
+                make_displayable(&data.additional_metadata_uri),
+                make_displayable(&data.media_uri),
+                make_displayable(&data.media_hash),
+            );
+
+            ("Issue NFT", address_short)
+        }
+
+        TxOutput::DataDeposit(data) => ("Data deposit", const_hex::encode(data)),
+
+        TxOutput::Htlc(value, data) => {
+            let address_short = format!(
+                "Secret hash: {:x}\nSpend key: {}\nRefund key: {}\nRefund time lock: {}\n{}",
+                const_hex::display(data.secret_hash.0),
+                to_address(&data.spend_key, coin)?,
+                to_address(&data.refund_key, coin)?,
+                format_lock(&data.refund_timelock)?,
+                format_value(value, coin)?
+            );
+            ("HTLC", address_short)
+        }
+
+        TxOutput::CreateOrder(data) => {
+            let ask_amount = format_value(&data.ask, coin)?;
+            let give_amount = format_value(&data.give, coin)?;
+            let address_short = format!(
+                "Conclude key: {}\nAsk: {}\nGive: {}",
+                to_address(&data.conclude_key, coin)?,
+                ask_amount,
+                give_amount
+            );
+            ("Create order", address_short)
+        }
+    };
+
+    Ok(FormattedOutput { name, value })
+}
+
+fn format_input(input: &InputCommand, coin: mlcp::CoinType) -> Result<FormattedOutput, StatusWord> {
+    let (name, value) = match input {
+        InputCommand::AccountSpending(cmd) => match cmd {
+            AccountSpending::DelegationBalance(delegation_id, amount) => {
+                let address_short = format!(
+                    "Delegation ID: {}\nAmount: {}",
+                    delegation_id_to_address(delegation_id, coin)?,
+                    format_coin_amount_with_name(*amount, coin)
+                );
+                if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                    ("Deleg wdrwl", address_short)
+                } else {
+                    ("Delegation withdrawal", address_short)
+                }
+            }
+        },
+        InputCommand::AccountCommand(cmd) => match cmd {
+            AccountCommand::MintTokens(token_id, amount) => {
+                let address_short = format!(
+                    "Token ID: {}\nAmount: {}",
+                    token_id_to_address(token_id, coin)?,
+                    format_atoms(*amount)
+                );
+                ("Mint tokens", address_short)
+            }
+            AccountCommand::UnmintTokens(token_id) => {
+                let address_short = format!("Token ID: {}", token_id_to_address(token_id, coin)?,);
+                ("Unmint tokens", address_short)
+            }
+            AccountCommand::LockTokenSupply(token_id) => {
+                let address_short = format!("Token ID: {}", token_id_to_address(token_id, coin)?);
+                if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                    ("Lock supply", address_short)
+                } else {
+                    ("Lock token supply", address_short)
+                }
+            }
+            AccountCommand::FreezeToken(token_id, is_unfreezable) => {
+                let address_short = format!(
+                    "Token ID: {}\nIs unfreezable: {}",
+                    token_id_to_address(token_id, coin)?,
+                    if *is_unfreezable == IsTokenUnfreezable::Yes {
+                        "Yes"
+                    } else {
+                        "No"
+                    }
+                );
+                ("Freeze token", address_short)
+            }
+            AccountCommand::UnfreezeToken(token_id) => {
+                let address_short = format!("Token ID: {}", token_id_to_address(token_id, coin)?,);
+                if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                    ("Unfrz token", address_short)
+                } else {
+                    ("Unfreeze token", address_short)
+                }
+            }
+            AccountCommand::ChangeTokenAuthority(token_id, new_authority) => {
+                let address_short = format!(
+                    "Token ID: {}\nNew authority: {}",
+                    token_id_to_address(token_id, coin)?,
+                    to_address(new_authority, coin)?
+                );
+                if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                    ("Chg tkn auth", address_short)
+                } else {
+                    ("Change token authority", address_short)
+                }
+            }
+            AccountCommand::ChangeTokenMetadataUri(token_id, new_metadata_uri) => {
+                let address_short = format!(
+                    "Token ID: {}\nNew metadata URI: {}",
+                    token_id_to_address(token_id, coin)?,
+                    make_displayable(new_metadata_uri)
+                );
+                if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                    ("Chg tkn meta", address_short)
+                } else {
+                    ("Change token metadata URI", address_short)
+                }
+            }
+            AccountCommand::ConcludeOrder(_) | AccountCommand::FillOrder(_, _, _) => {
+                return Err(StatusWord::OrdersV0NotSupported);
+            }
+        },
+        InputCommand::OrderCommand(cmd, additional_info) => match cmd {
+            OrderAccountCommand::FillOrder(order_id, fill_amount) => {
+                let fill_value =
+                    output_value_with_amount(&additional_info.initially_asked, *fill_amount);
+                let address_short = format!(
+                    "Order ID: {}\nFill amount: {}",
+                    order_id_to_address(order_id, coin)?,
+                    format_value(&fill_value, coin)?,
+                );
+                ("Fill order", address_short)
+            }
+            OrderAccountCommand::FreezeOrder(order_id) => {
+                let address_short = format!("Order ID: {}", order_id_to_address(order_id, coin)?);
+                ("Freeze order", address_short)
+            }
+            OrderAccountCommand::ConcludeOrder(order_id) => {
+                let address_short = format!("Order ID: {}", order_id_to_address(order_id, coin)?);
+                if cfg!(any(target_os = "nanosplus", target_os = "nanox")) {
+                    ("Conclude ord", address_short)
+                } else {
+                    ("Conclude order", address_short)
+                }
+            }
+        },
+    };
+
+    Ok(FormattedOutput { name, value })
+}
diff --git a/crates/app-core/src/app_ui/utils.rs b/crates/app-core/src/app_ui/utils.rs
new file mode 100644
index 0000000..614d716
--- /dev/null
+++ b/crates/app-core/src/app_ui/utils.rs
@@ -0,0 +1,90 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use alloc::string::String;
+
+use ledger_device_sdk::{ecc::ECPublicKey, include_gif, nbgl::NbglGlyph};
+
+use mintlayer_core_primitives::PUBLIC_KEY_HASH_SIZE;
+use mintlayer_messages::{Destination, PublicKeyHash, Secp256k1PublicKey, encode, encode_to};
+
+use crate::{StatusWord, hasher::Hasher, mlcp, utils::cut_array};
+
+pub fn bech32m_encode(hrp: &str, data: &[u8]) -> Result<String, StatusWord> {
+    let parsed_hrp = bech32::Hrp::parse(hrp).map_err(|_| StatusWord::AddressEncodingFail)?;
+
+    let encoded = bech32::encode::<bech32::Bech32m>(parsed_hrp, data)
+        .map_err(|_| StatusWord::AddressEncodingFail)?;
+
+    Ok(encoded)
+}
+
+pub fn to_address(destination: &Destination, coin: mlcp::CoinType) -> Result<String, StatusWord> {
+    let hrp = coin.address_prefix(destination.into());
+    bech32m_encode(hrp, &encode(destination))
+}
+
+/// Load glyph from file with include_gif macro. Creates an NBGL compatible glyph.
+pub const fn load_glyph() -> NbglGlyph<'static> {
+    #[cfg(target_os = "apex_p")]
+    const MINTLAYER: NbglGlyph =
+        NbglGlyph::from_include(include_gif!("../../media/glyphs/mintlayer_48x48.png", NBGL));
+    #[cfg(any(target_os = "stax", target_os = "flex"))]
+    const MINTLAYER: NbglGlyph =
+        NbglGlyph::from_include(include_gif!("../../media/glyphs/mintlayer_64x64.gif", NBGL));
+    #[cfg(any(target_os = "nanosplus", target_os = "nanox"))]
+    const MINTLAYER: NbglGlyph =
+        NbglGlyph::from_include(include_gif!("../../media/icons/mintlayer_14x14.gif", NBGL));
+
+    MINTLAYER
+}
+
+pub fn compress_public_key<const T: char>(
+    public_key: &ECPublicKey<65, T>,
+) -> Result<Secp256k1PublicKey, StatusWord> {
+    let uncompressed_key = &public_key.pubkey;
+    if uncompressed_key[0] != 0x04 {
+        return Err(StatusWord::InvalidUncompressedPublicKey);
+    }
+
+    let mut compressed_key = [0u8; 33];
+
+    let y_coordinate = &uncompressed_key[33..65];
+    let prefix = if y_coordinate[31].is_multiple_of(2) {
+        0x02
+    } else {
+        0x03
+    };
+
+    compressed_key[0] = prefix;
+
+    let x_coordinate = &uncompressed_key[1..33];
+    compressed_key[1..].copy_from_slice(x_coordinate);
+
+    Ok(Secp256k1PublicKey(compressed_key))
+}
+
+pub fn to_public_key_hash(pk: &Secp256k1PublicKey) -> Result<PublicKeyHash, StatusWord> {
+    let mut hasher = Hasher::new();
+
+    encode_to(mlcp::PublicKey::Secp256k1Schnorr(*pk), &mut hasher);
+
+    let full_hash = hasher.finalize()?;
+    let pkh: [u8; PUBLIC_KEY_HASH_SIZE] = cut_array(full_hash.as_fixed_bytes());
+
+    Ok(PublicKeyHash(pkh))
+}
diff --git a/crates/app-core/src/errors.rs b/crates/app-core/src/errors.rs
new file mode 100644
index 0000000..f4faa50
--- /dev/null
+++ b/crates/app-core/src/errors.rs
@@ -0,0 +1,56 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use ledger_device_sdk::ecc::CxError;
+use mintlayer_messages::StatusWord;
+
+pub fn cx_err_to_status(e: CxError) -> StatusWord {
+    match e {
+        CxError::Carry => StatusWord::EccCarry,
+        CxError::Locked => StatusWord::EccLocked,
+        CxError::Unlocked => StatusWord::EccUnlocked,
+        CxError::NotLocked => StatusWord::EccNotLocked,
+        CxError::NotUnlocked => StatusWord::EccNotUnlocked,
+        CxError::InternalError => StatusWord::EccInternalError,
+        CxError::InvalidParameterSize => StatusWord::EccInvalidParameterSize,
+        CxError::InvalidParameterValue => StatusWord::EccInvalidParameterValue,
+        CxError::InvalidParameter => StatusWord::EccInvalidParameter,
+        CxError::NotInvertible => StatusWord::EccNotInvertible,
+        CxError::Overflow => StatusWord::EccOverflow,
+        CxError::MemoryFull => StatusWord::EccMemoryFull,
+        CxError::NoResidue => StatusWord::EccNoResidue,
+        CxError::PointAtInfinity => StatusWord::EccPointAtInfinity,
+        CxError::InvalidPoint => StatusWord::EccInvalidPoint,
+        CxError::InvalidCurve => StatusWord::EccInvalidCurve,
+        CxError::GenericError => StatusWord::EccGenericError,
+    }
+}
+
+pub fn sdk_err_to_status(e: ledger_device_sdk::io::StatusWords) -> StatusWord {
+    match e {
+        ledger_device_sdk::io::StatusWords::Ok => StatusWord::Ok,
+        ledger_device_sdk::io::StatusWords::BadCla => StatusWord::ClaNotSupported,
+        ledger_device_sdk::io::StatusWords::NothingReceived => StatusWord::NothingReceived,
+        ledger_device_sdk::io::StatusWords::BadIns => StatusWord::InsNotSupported,
+        ledger_device_sdk::io::StatusWords::BadP1P2 => StatusWord::WrongP1P2,
+        ledger_device_sdk::io::StatusWords::BadLen => StatusWord::WrongApduLength,
+        ledger_device_sdk::io::StatusWords::UserCancelled => StatusWord::Deny,
+        ledger_device_sdk::io::StatusWords::Unknown => StatusWord::Unknown,
+        ledger_device_sdk::io::StatusWords::Panic => StatusWord::Panic,
+        ledger_device_sdk::io::StatusWords::DeviceLocked => StatusWord::DeviceLocked,
+    }
+}
diff --git a/crates/app-core/src/handlers/get_public_key.rs b/crates/app-core/src/handlers/get_public_key.rs
new file mode 100644
index 0000000..acd5409
--- /dev/null
+++ b/crates/app-core/src/handlers/get_public_key.rs
@@ -0,0 +1,46 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use ledger_device_sdk::ecc::{Secp256k1, SeedDerive};
+
+use mintlayer_messages::{
+    ChainCode, GetPubKeyReq, PublicKeyResponse, UncompressedSecp256k1PublicKey,
+};
+
+use crate::{StatusWord, app_ui::address::ui_display_pk, utils::check_derivation_path};
+
+pub fn handle_get_public_key(
+    req: GetPubKeyReq,
+    display: bool,
+) -> Result<PublicKeyResponse, StatusWord> {
+    check_derivation_path(req.path.as_ref(), req.coin_type.into())?;
+
+    let (k, cc) = Secp256k1::derive_from(req.path.as_ref());
+    let pk = k.public_key().map_err(|_| StatusWord::KeyDeriveFail)?;
+    let code = cc.ok_or(StatusWord::KeyDeriveFail)?;
+
+    // Display address on device if requested
+    if display && !ui_display_pk(&pk, req.coin_type.into())? {
+        return Err(StatusWord::Deny);
+    }
+    let response = PublicKeyResponse {
+        public_key: UncompressedSecp256k1PublicKey(pk.pubkey),
+        chain_code: ChainCode(code.value),
+    };
+
+    Ok(response)
+}
diff --git a/crates/app-core/src/handlers/mod.rs b/crates/app-core/src/handlers/mod.rs
new file mode 100644
index 0000000..82f67fc
--- /dev/null
+++ b/crates/app-core/src/handlers/mod.rs
@@ -0,0 +1,20 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+pub mod get_public_key;
+pub mod sign_message;
+pub mod sign_tx;
diff --git a/crates/app-core/src/handlers/sign_message.rs b/crates/app-core/src/handlers/sign_message.rs
new file mode 100644
index 0000000..67f3736
--- /dev/null
+++ b/crates/app-core/src/handlers/sign_message.rs
@@ -0,0 +1,140 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use alloc::vec::Vec;
+
+use ledger_device_sdk::ecc::{ECPrivateKey, Secp256k1, SeedDerive};
+use ledger_secure_sdk_sys::*;
+
+use mintlayer_messages::{
+    AddrType, Bip32Path, MsgSignatureResponse, SignMessageStartReq, Signature,
+};
+
+use crate::{
+    DataContext, StatusWord, app_ui::sign::ui_display_message, errors::cx_err_to_status,
+    hasher::Hasher, mlcp, utils::check_derivation_path,
+};
+
+pub struct SignMessageContext {
+    path: Bip32Path,
+    coin: mlcp::CoinType,
+    addr_type: AddrType,
+    review_finished: bool,
+}
+
+impl SignMessageContext {
+    pub fn new(req: SignMessageStartReq) -> Self {
+        Self {
+            path: req.path,
+            coin: req.coin.into(),
+            addr_type: req.addr_type,
+            review_finished: false,
+        }
+    }
+
+    pub fn finished(&self) -> bool {
+        self.review_finished
+    }
+}
+
+pub fn setup_sign_message(req: SignMessageStartReq) -> Result<DataContext, StatusWord> {
+    check_derivation_path(req.path.as_ref(), req.coin.into())?;
+
+    Ok(DataContext::SignMessageContext(SignMessageContext::new(
+        req,
+    )))
+}
+
+// TODO: implement stateful message signing, where the message is received and displayed for review
+// in portions, to allow signing messages of arbitrary sizes.
+// See https://github.com/mintlayer/mintlayer-ledger-app/issues/13.
+pub fn handle_sign_message(
+    message: &[u8],
+    ctx: &mut SignMessageContext,
+) -> Result<MsgSignatureResponse, StatusWord> {
+    let private_key = Secp256k1::derive_from_path(ctx.path.as_ref());
+    let public_key = private_key
+        .public_key()
+        .map_err(|_| StatusWord::KeyDeriveFail)?;
+
+    // Display review. If user approves, sign it.
+    // Otherwise, return a "deny" status word.
+    if ui_display_message(message, &public_key, ctx.coin, ctx.addr_type)? {
+        ctx.review_finished = true;
+        Ok(compute_signature(&private_key, message)?)
+    } else {
+        ctx.review_finished = true;
+        Err(StatusWord::Deny)
+    }
+}
+
+fn compute_signature<const N: usize>(
+    private_key: &ECPrivateKey<N, 'W'>,
+    message: &[u8],
+) -> Result<MsgSignatureResponse, StatusWord> {
+    const MESSAGE_MAGIC_PREFIX: &str = "===MINTLAYER MESSAGE BEGIN===\n";
+    const MESSAGE_MAGIC_SUFFIX: &str = "\n===MINTLAYER MESSAGE END===";
+
+    let message = MESSAGE_MAGIC_PREFIX
+        .as_bytes()
+        .iter()
+        .chain(message.iter())
+        .chain(MESSAGE_MAGIC_SUFFIX.as_bytes().iter())
+        .copied()
+        .collect::<Vec<_>>();
+
+    let message_hash = Hasher::hash(&message)?;
+    let message_hash2 = Hasher::hash(message_hash.as_bytes())?;
+
+    let sig = schnorr_sign(private_key, message_hash2.as_bytes())?;
+
+    let response = MsgSignatureResponse {
+        signature: Signature(sig),
+    };
+
+    Ok(response)
+}
+
+pub fn schnorr_sign<const N: usize>(
+    private_key: &ECPrivateKey<N, 'W'>,
+    msg: &[u8],
+) -> Result<[u8; 64], StatusWord> {
+    const HASH_ALGORITHM_ID: u8 = CX_SHA256;
+    const SIGNING_MODE: u32 = CX_ECSCHNORR_BIP0340 | CX_RND_PROVIDED | CX_LAST;
+
+    let mut sig = [0u8; 64];
+    let mut sig_len = 64;
+
+    // The `unsafe` block is required for FFI.
+    let err_code = unsafe {
+        cx_ecschnorr_sign_no_throw(
+            private_key as *const ECPrivateKey<N, 'W'> as *const cx_ecfp_256_private_key_s,
+            SIGNING_MODE,
+            HASH_ALGORITHM_ID,
+            msg.as_ptr(),
+            msg.len(),
+            sig.as_mut_ptr(),
+            &mut sig_len,
+        )
+    };
+
+    if err_code != CX_OK {
+        Err(cx_err_to_status(err_code.into()))
+    } else {
+        Ok(sig)
+    }
+}
diff --git a/crates/app-core/src/handlers/sign_tx/mod.rs b/crates/app-core/src/handlers/sign_tx/mod.rs
new file mode 100644
index 0000000..20a6f16
--- /dev/null
+++ b/crates/app-core/src/handlers/sign_tx/mod.rs
@@ -0,0 +1,516 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use alloc::{boxed::Box, vec::Vec};
+
+use ledger_device_sdk::{
+    ecc::{Secp256k1, SeedDerive},
+    nbgl::{NbglSpinner, NbglStreamingReview},
+};
+
+use mintlayer_messages::{
+    H256, InputAddressPath, OrderAccountCommand, Response, SignTxNextReq, SignTxStartReq,
+    Signature, TransactionVersion, TxInputCommitmentData, TxInputData, TxInputSignatureResponse,
+    TxInputWithAdditionalInfo, TxOutputData, encode_as_compact_to, encode_to,
+};
+
+use crate::{
+    DataContext, StatusWord,
+    app_ui::sign::{
+        ui_approve_streaming_review, ui_new_streaming_review, ui_start_streaming_review,
+        ui_streaming_review_show_input, ui_streaming_review_show_output,
+    },
+    handlers::sign_message::schnorr_sign,
+    hasher::Hasher,
+    mlcp,
+    utils::{CompressedDerivationPathForTxSigning, check_derivation_path_for_tx_signing},
+};
+
+mod summary_collector;
+
+pub use summary_collector::{CoinOrTokenId, InputCommand, TxSummaryCollector, TxType};
+
+// u32 is enough to cover max possible number of inputs and outputs (note that usize is also
+// 32-bit on Ledger, but we want to be specific about size)
+type Index = u32;
+
+/// A "signature target". Usually, one input will produce one SigTarget (more than one SigTarget
+/// is possible in the case of multisig; it can also be zero for non-signable pseudo-inputs, such
+/// as FillOrder).
+pub struct SigTarget {
+    pub path: CompressedDerivationPathForTxSigning,
+    pub input_idx: Index,
+    pub multisig_idx: Option<Index>,
+}
+
+impl SigTarget {
+    fn new(
+        addr: InputAddressPath,
+        input_idx: Index,
+        coin: mlcp::CoinType,
+    ) -> Result<Self, StatusWord> {
+        let path = check_derivation_path_for_tx_signing(addr.path.as_ref(), coin)?;
+
+        Ok(Self {
+            path,
+            input_idx,
+            multisig_idx: addr.multisig_idx,
+        })
+    }
+}
+
+pub struct TxMetadata {
+    coin: mlcp::CoinType,
+    num_inputs: Index,
+    num_outputs: Index,
+}
+
+pub struct TxInputsProcessingContext {
+    metadata: TxMetadata,
+
+    tx_hasher: Hasher,
+
+    // Note: input commitments have to be sent together with the inputs, because they contain
+    // the actual amounts that the inputs consume. But they can't be put into the transaction hasher
+    // until all inputs have been processed, so they'll have to be sent again via a separate pass.
+    // We hash the commitments to ensure that the same ones are sent during both passes.
+    input_commitments_hasher: Hasher,
+
+    summary: TxSummaryCollector,
+    sig_targets: Vec<SigTarget>,
+
+    spinner: NbglSpinner,
+
+    num_inputs_parsed: Index,
+}
+
+impl TxInputsProcessingContext {
+    fn advance_next_input_step(mut self: Box<Self>) -> Result<TxProcessingContext, StatusWord> {
+        self.num_inputs_parsed += 1;
+        let finished_with_inputs = self.num_inputs_parsed >= self.metadata.num_inputs;
+
+        if finished_with_inputs {
+            if self.sig_targets.is_empty() {
+                return Err(StatusWord::NothingToSign);
+            }
+
+            // Update hash for input commitments and proceed with outputs
+            self.tx_hasher
+                .update(&self.metadata.num_inputs.to_le_bytes());
+
+            let input_commitments_hash = self.input_commitments_hasher.finalize()?;
+
+            Ok(TxProcessingContext::ProcessingInputCommitments(Box::new(
+                TxInputCommitmentsProcessingContext {
+                    metadata: self.metadata,
+                    tx_hasher: self.tx_hasher,
+                    input_commitments_hasher: Hasher::new(),
+                    expected_input_commitments_hash: input_commitments_hash,
+                    summary: self.summary,
+                    sig_targets: self.sig_targets,
+                    spinner: self.spinner,
+                    num_inputs_parsed: 0,
+                },
+            )))
+        } else {
+            Ok(TxProcessingContext::ProcessingInputs(self))
+        }
+    }
+}
+
+pub struct TxInputCommitmentsProcessingContext {
+    metadata: TxMetadata,
+
+    tx_hasher: Hasher,
+    input_commitments_hasher: Hasher,
+    expected_input_commitments_hash: H256,
+
+    summary: TxSummaryCollector,
+    sig_targets: Vec<SigTarget>,
+
+    spinner: NbglSpinner,
+
+    num_inputs_parsed: Index,
+}
+
+impl TxInputCommitmentsProcessingContext {
+    fn advance_next_input_additional_info_step(
+        mut self: Box<Self>,
+        review: &NbglStreamingReview,
+    ) -> Result<TxProcessingContext, StatusWord> {
+        self.num_inputs_parsed += 1;
+
+        let finished_with_inputs = self.num_inputs_parsed >= self.metadata.num_inputs;
+
+        if finished_with_inputs {
+            // Make sure the hashes match before continuing with the outputs
+            let input_commitments_hash = self.input_commitments_hasher.finalize()?;
+
+            if input_commitments_hash != self.expected_input_commitments_hash {
+                return Err(StatusWord::DifferentInputCommitmentHash);
+            }
+
+            if !ui_start_streaming_review(review) {
+                return Err(StatusWord::Deny);
+            }
+
+            if let Some(command) = self.summary.input_command()
+                && !ui_streaming_review_show_input(review, command, self.metadata.coin)?
+            {
+                return Err(StatusWord::Deny);
+            }
+
+            encode_as_compact_to(self.metadata.num_outputs, &mut self.tx_hasher);
+
+            if self.metadata.num_outputs > 0 {
+                let new_context =
+                    TxProcessingContext::ProcessingOutputs(Box::new(TxOutputsProcessingContext {
+                        metadata: self.metadata,
+                        tx_hasher: self.tx_hasher,
+                        summary: self.summary,
+                        sig_targets: self.sig_targets,
+                        spinner: self.spinner,
+                        num_outputs_parsed: 0,
+                    }));
+                Ok(new_context)
+            } else {
+                switch_to_signing(
+                    review,
+                    self.tx_hasher,
+                    self.summary,
+                    self.metadata,
+                    self.sig_targets,
+                    self.spinner,
+                )
+            }
+        } else {
+            Ok(TxProcessingContext::ProcessingInputCommitments(self))
+        }
+    }
+}
+
+pub struct TxOutputsProcessingContext {
+    metadata: TxMetadata,
+
+    tx_hasher: Hasher,
+
+    summary: TxSummaryCollector,
+    sig_targets: Vec<SigTarget>,
+
+    spinner: NbglSpinner,
+
+    num_outputs_parsed: Index,
+}
+
+impl TxOutputsProcessingContext {
+    pub fn coin(&self) -> mlcp::CoinType {
+        self.metadata.coin
+    }
+
+    pub fn summary(&self) -> &TxSummaryCollector {
+        &self.summary
+    }
+
+    fn advance_next_output_state(
+        mut self: Box<Self>,
+        review: &NbglStreamingReview,
+    ) -> Result<TxProcessingContext, StatusWord> {
+        if self.num_outputs_parsed < (self.metadata.num_outputs - 1) {
+            self.num_outputs_parsed += 1;
+            Ok(TxProcessingContext::ProcessingOutputs(self))
+        } else {
+            switch_to_signing(
+                review,
+                self.tx_hasher,
+                self.summary,
+                self.metadata,
+                self.sig_targets,
+                self.spinner,
+            )
+        }
+    }
+}
+
+fn switch_to_signing(
+    review: &NbglStreamingReview,
+    tx_hasher: Hasher,
+    summary: TxSummaryCollector,
+    metadata: TxMetadata,
+    sig_targets: Vec<SigTarget>,
+    spinner: NbglSpinner,
+) -> Result<TxProcessingContext, StatusWord> {
+    if ui_approve_streaming_review(review, &summary, metadata.coin)? {
+        // Finalize the tx hash for signing
+        let first_hash = tx_hasher.finalize()?;
+        let tx_hash = Hasher::hash(first_hash.as_bytes())?;
+
+        Ok(TxProcessingContext::Signing(Box::new(TxSigningContext {
+            metadata,
+            sig_targets,
+            spinner,
+            num_sigs_produced: 0,
+            tx_hash,
+        })))
+    } else {
+        Err(StatusWord::Deny)
+    }
+}
+
+pub struct TxSigningContext {
+    metadata: TxMetadata,
+    tx_hash: H256,
+
+    sig_targets: Vec<SigTarget>,
+
+    spinner: NbglSpinner,
+
+    num_sigs_produced: Index,
+}
+
+impl TxSigningContext {
+    fn compute_signature_and_append(
+        mut self: Box<Self>,
+    ) -> Result<(TxInputSignatureResponse, TxProcessingContext), StatusWord> {
+        let sig_target = self
+            .sig_targets
+            .get(self.num_sigs_produced as usize)
+            .ok_or(StatusWord::WrongContext)?;
+
+        let path = sig_target.path.to_full_path(self.metadata.coin);
+        let private_key = Secp256k1::derive_from_path(&path);
+        let sig = schnorr_sign(&private_key, self.tx_hash.as_bytes())?;
+
+        let signature = Signature(sig);
+        let input_idx = sig_target.input_idx;
+        let multisig_idx = sig_target.multisig_idx;
+
+        let has_next = ((self.num_sigs_produced + 1) as usize) < self.sig_targets.len();
+
+        let response = TxInputSignatureResponse {
+            signature,
+            multisig_idx,
+            input_idx,
+            has_next,
+        };
+
+        let new_ctx = if has_next {
+            self.num_sigs_produced += 1;
+            TxProcessingContext::Signing(self)
+        } else {
+            TxProcessingContext::Finished
+        };
+
+        Ok((response, new_ctx))
+    }
+}
+
+pub enum TxProcessingContext {
+    ProcessingInputs(Box<TxInputsProcessingContext>),
+    ProcessingInputCommitments(Box<TxInputCommitmentsProcessingContext>),
+    ProcessingOutputs(Box<TxOutputsProcessingContext>),
+    Signing(Box<TxSigningContext>),
+    Finished,
+}
+
+impl TxProcessingContext {
+    pub fn new(
+        SignTxStartReq {
+            coin,
+            version,
+            num_inputs,
+            num_outputs,
+        }: SignTxStartReq,
+    ) -> Result<Self, StatusWord> {
+        if num_inputs == 0 {
+            return Err(StatusWord::TxWithZeroInputs);
+        }
+
+        match version {
+            TransactionVersion::V1 => {
+                const VERSION_1: u8 = 1;
+                const SIG_HASH_TYPE_ALL: u8 = 1;
+
+                let mut tx_hasher = Hasher::new();
+                // mode
+                tx_hasher.update(&[SIG_HASH_TYPE_ALL]);
+                // version
+                tx_hasher.update(&[VERSION_1]);
+                // flags
+                tx_hasher.update(&[0; 16]);
+
+                tx_hasher.update(&num_inputs.to_le_bytes());
+
+                Ok(Self::ProcessingInputs(Box::new(
+                    TxInputsProcessingContext {
+                        metadata: TxMetadata {
+                            coin: coin.into(),
+                            num_inputs,
+                            num_outputs,
+                        },
+                        tx_hasher,
+                        spinner: NbglSpinner::new(),
+                        summary: TxSummaryCollector::new(),
+                        num_inputs_parsed: 0,
+                        input_commitments_hasher: Hasher::new(),
+                        sig_targets: Vec::new(),
+                    },
+                )))
+            }
+        }
+    }
+
+    /// Shows a spinner while processing the inputs and input commitments if there are more than a few,
+    /// as well as while signing and returning the signatures.
+    pub fn show_spinner(&mut self) {
+        let (metadata, spinner) = match self {
+            Self::ProcessingInputs(ctx) => (&ctx.metadata, &mut ctx.spinner),
+            Self::ProcessingInputCommitments(ctx) => (&ctx.metadata, &mut ctx.spinner),
+            Self::Signing(ctx) => {
+                ctx.spinner.show("Signing...");
+                return;
+            }
+            // While parsing outputs we are showing the review and not the spinner.
+
+            // TODO: inputs may need to be reviewed one by one, just like outputs.
+            // See https://github.com/mintlayer/mintlayer-ledger-app/issues/14.
+            // Also see the TODO near `TxSummaryCollector::input_command`.
+
+            // TODO: change outputs should be detected and not presented for review; once this is
+            // implemented, the spinner logic may need to be revised.
+            // See https://github.com/mintlayer/mintlayer-ledger-app/issues/17.
+            Self::ProcessingOutputs(_) | Self::Finished => return,
+        };
+
+        // We show a spinner while processing the inputs and input commitments if there are more than 5;
+        // 5 was chosen somewhat arbitrarily
+        let transaction_has_many_inputs = metadata.num_inputs > 5;
+
+        if transaction_has_many_inputs {
+            spinner.show("Processing transaction...");
+        }
+    }
+
+    pub fn finished(&self) -> bool {
+        matches!(self, Self::Finished)
+    }
+}
+
+pub fn setup_sign_tx(req: SignTxStartReq) -> Result<DataContext, StatusWord> {
+    let mut tx_ctx = TxProcessingContext::new(req)?;
+
+    tx_ctx.show_spinner();
+
+    Ok(DataContext::TxContext(tx_ctx, ui_new_streaming_review()))
+}
+
+fn handle_input(
+    input_data: Box<TxInputData>,
+    mut ctx: Box<TxInputsProcessingContext>,
+) -> Result<TxProcessingContext, StatusWord> {
+    // FillOrder inputs are pseudo-inputs that should not be signed; if the host requests
+    // a signature in such a case, it is doing something wrong, so we reject it.
+    // Note that we only check for V1 orders here, since V0 are not supported by the app
+    // (see StatusWord::OrdersV0NotSupported).
+    if is_v1_fill_order_input(&input_data.input) && !input_data.addresses.is_empty() {
+        return Err(StatusWord::FillOrderSigRequested);
+    }
+
+    let num_inputs_parsed = ctx.num_inputs_parsed;
+    let sig_targets = input_data
+        .addresses
+        .into_iter()
+        .map(|a| SigTarget::new(a, num_inputs_parsed, ctx.metadata.coin))
+        .collect::<Result<Vec<_>, StatusWord>>()?;
+    ctx.sig_targets.extend(sig_targets);
+
+    ctx.summary.process_input(&input_data.input)?;
+
+    let (input, commitment) = input_data.input.into_input_and_commitment();
+    encode_to(&commitment, &mut ctx.input_commitments_hasher);
+    encode_to(&input, &mut ctx.tx_hasher);
+    ctx.advance_next_input_step()
+}
+
+fn is_v1_fill_order_input(input: &TxInputWithAdditionalInfo) -> bool {
+    match input {
+        TxInputWithAdditionalInfo::OrderAccountCommand(cmd, _) => match cmd {
+            OrderAccountCommand::FillOrder(_, _) => true,
+            OrderAccountCommand::FreezeOrder(_) | OrderAccountCommand::ConcludeOrder(_) => false,
+        },
+        TxInputWithAdditionalInfo::Utxo(_, _)
+        | TxInputWithAdditionalInfo::Account(_)
+        | TxInputWithAdditionalInfo::AccountCommand(_, _) => false,
+    }
+}
+
+fn handle_input_commitment(
+    comm_data: &TxInputCommitmentData,
+    mut ctx: Box<TxInputCommitmentsProcessingContext>,
+    review: &NbglStreamingReview,
+) -> Result<TxProcessingContext, StatusWord> {
+    encode_to(&comm_data.commitment, &mut ctx.input_commitments_hasher);
+    encode_to(&comm_data.commitment, &mut ctx.tx_hasher);
+    ctx.advance_next_input_additional_info_step(review)
+}
+
+fn handle_output(
+    output_data: &TxOutputData,
+    mut ctx: Box<TxOutputsProcessingContext>,
+    review: &NbglStreamingReview,
+) -> Result<TxProcessingContext, StatusWord> {
+    if ui_streaming_review_show_output(review, &output_data.output, ctx.metadata.coin)? {
+        ctx.summary.process_output(&output_data.output)?;
+        encode_to(&output_data.output, &mut ctx.tx_hasher);
+        ctx.advance_next_output_state(review)
+    } else {
+        Err(StatusWord::Deny)
+    }
+}
+
+pub fn handle_sign_tx(
+    req: SignTxNextReq,
+    ctx: TxProcessingContext,
+    review: &mut NbglStreamingReview,
+) -> Result<(Response, TxProcessingContext), StatusWord> {
+    match (req, ctx) {
+        (SignTxNextReq::ProcessInput(req), TxProcessingContext::ProcessingInputs(ctx)) => {
+            let new_ctx = handle_input(req, ctx)?;
+            Ok((Response::TxNext, new_ctx))
+        }
+        (
+            SignTxNextReq::ProcessInputCommitment(req),
+            TxProcessingContext::ProcessingInputCommitments(ctx),
+        ) => {
+            let new_ctx = handle_input_commitment(req.as_ref(), ctx, review)?;
+            Ok((Response::TxNext, new_ctx))
+        }
+        (SignTxNextReq::ProcessOutput(req), TxProcessingContext::ProcessingOutputs(ctx)) => {
+            let new_ctx = handle_output(req.as_ref(), ctx, review)?;
+            Ok((Response::TxNext, new_ctx))
+        }
+        (SignTxNextReq::ReturnNextSignature, TxProcessingContext::Signing(ctx)) => {
+            let (response, mut new_ctx) = ctx.compute_signature_and_append()?;
+            new_ctx.show_spinner();
+
+            Ok((Response::TxInputSignature(response), new_ctx))
+        }
+        (SignTxNextReq::ReturnNextSignature, TxProcessingContext::Finished) => {
+            Err(StatusWord::TxAlreadyFinished)
+        }
+        _ => Err(StatusWord::WrongContext),
+    }
+}
diff --git a/crates/app-core/src/handlers/sign_tx/summary_collector.rs b/crates/app-core/src/handlers/sign_tx/summary_collector.rs
new file mode 100644
index 0000000..2425ea8
--- /dev/null
+++ b/crates/app-core/src/handlers/sign_tx/summary_collector.rs
@@ -0,0 +1,1066 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use alloc::collections::BTreeMap;
+
+use mintlayer_messages::{
+    AccountCommand, AccountSpending, AdditionalOrderInfo, AdditionalUtxoInfo, Amount,
+    OrderAccountCommand, OutputValue, TokenId, TxInputWithAdditionalInfo, TxOutput,
+};
+
+use crate::StatusWord;
+
+#[derive(Debug, Eq, Ord, PartialEq, PartialOrd)]
+pub enum CoinOrTokenId {
+    Coin,
+    TokenId(TokenId),
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum TxType {
+    Transfer,
+    Burn,
+    Htlc,
+    CreateDelegation,
+    DelegateStaking,
+    DelegationWithdrawal,
+    CreateStakePool,
+    DecommissionStakePool,
+    CreateNft,
+    CreateToken,
+    MintTokens,
+    UnmintTokens,
+    FreezeToken,
+    UnfreezeToken,
+    LockTokenSupply,
+    ChangeTokenAuthority,
+    ChangeTokenMetadataUri,
+    FillOrder,
+    FreezeOrder,
+    CreateOrder,
+    ConcludeOrder,
+    DataDeposit,
+    ComplexTransaction,
+}
+
+pub enum InputCommand {
+    AccountSpending(AccountSpending),
+    AccountCommand(AccountCommand),
+    OrderCommand(OrderAccountCommand, AdditionalOrderInfo),
+}
+
+pub struct TxSummaryCollector {
+    tx_type: Option<TxType>,
+    input_command: Option<InputCommand>,
+    total_inputs: BTreeMap<CoinOrTokenId, Amount>,
+    total_outputs: BTreeMap<CoinOrTokenId, Amount>,
+}
+
+impl TxSummaryCollector {
+    pub fn new() -> Self {
+        Self {
+            tx_type: None,
+            input_command: None,
+            total_inputs: BTreeMap::new(),
+            total_outputs: BTreeMap::new(),
+        }
+    }
+
+    // TODO:
+    // 1) currently consensus only forbids multiple account commands (AccountCommand or OrderAccountCommand) per tx,
+    //    but the number of account spendings is unlimited and they can co-exist with an account command;
+    // 2) probably the app shouldn't try being smart and assume any number of account commands is possible, asking
+    //    the user to approve them as they arrive, same as it's done for outputs;
+    // 3) if the app does try to be smart, then it should fail when multiple commands are encountered, instead of
+    //    silently overwriting `input_command`.
+    // See https://github.com/mintlayer/mintlayer-ledger-app/issues/14.
+    // Also see the TODO near `TxProcessingContext::show_spinner`.
+    pub fn input_command(&self) -> Option<&InputCommand> {
+        self.input_command.as_ref()
+    }
+
+    pub fn tx_type(&self) -> Option<TxType> {
+        self.tx_type
+    }
+
+    pub fn total_inputs(&self) -> &BTreeMap<CoinOrTokenId, Amount> {
+        &self.total_inputs
+    }
+
+    pub fn total_outputs(&self) -> &BTreeMap<CoinOrTokenId, Amount> {
+        &self.total_outputs
+    }
+
+    pub fn fees_iter(
+        &self,
+    ) -> impl Iterator<Item = Result<(&CoinOrTokenId, u128), StatusWord>> + '_ {
+        // TODO: if an asset is only present in total_outputs, this will not fail with TxFeeUnderflow,
+        // but it should.
+        // See https://github.com/mintlayer/mintlayer-ledger-app/issues/15.
+        self.total_inputs()
+            .iter()
+            .map(move |(coin_or_token, amount)| {
+                let out = *self
+                    .total_outputs()
+                    .get(coin_or_token)
+                    .unwrap_or(&Amount::ZERO);
+
+                let fee = amount
+                    .into_atoms()
+                    .checked_sub(out.into_atoms())
+                    .ok_or(StatusWord::TxFeeUnderflow)?;
+
+                Ok((coin_or_token, fee))
+            })
+    }
+
+    pub fn process_output(&mut self, out: &TxOutput) -> Result<(), StatusWord> {
+        match &out {
+            TxOutput::Transfer(value, _) | TxOutput::LockThenTransfer(value, _, _) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::Transfer);
+
+                let (coin_or_token_id, amount) = into_coin_or_token_id_and_amount(value)?;
+                self.increase_output_totals(coin_or_token_id, amount)?;
+            }
+            TxOutput::Burn(value) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::Burn);
+
+                let (coin_or_token_id, amount) = into_coin_or_token_id_and_amount(value)?;
+                self.increase_output_totals(coin_or_token_id, amount)?;
+            }
+            TxOutput::Htlc(value, _) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::Htlc);
+
+                let (coin_or_token_id, amount) = into_coin_or_token_id_and_amount(value)?;
+                self.increase_output_totals(coin_or_token_id, amount)?;
+            }
+            TxOutput::CreateStakePool(_, data) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::CreateStakePool);
+
+                self.increase_output_totals(CoinOrTokenId::Coin, data.pledge)?;
+            }
+            TxOutput::ProduceBlockFromStake(_, _) => {}
+            TxOutput::DelegateStaking(amount, _) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::DelegateStaking);
+                self.increase_output_totals(CoinOrTokenId::Coin, *amount)?;
+            }
+            TxOutput::CreateDelegationId(_, _) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::CreateDelegation);
+            }
+            TxOutput::IssueFungibleToken(_) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::CreateToken);
+            }
+            TxOutput::DataDeposit(_) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::DataDeposit);
+            }
+            TxOutput::IssueNft(_, _, _) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::CreateNft);
+            }
+            TxOutput::CreateOrder(order_data) => {
+                self.tx_type = merge_tx_type(self.tx_type, TxType::CreateOrder);
+                let (coin_or_token_id, amount) =
+                    into_coin_or_token_id_and_amount(&order_data.give)?;
+                self.increase_output_totals(coin_or_token_id, amount)?;
+            }
+        }
+
+        Ok(())
+    }
+
+    pub fn process_input(&mut self, inp: &TxInputWithAdditionalInfo) -> Result<(), StatusWord> {
+        match inp {
+            TxInputWithAdditionalInfo::Utxo(_, info) => match info {
+                AdditionalUtxoInfo::UtxoWithPoolData {
+                    utxo: _,
+                    staker_balance,
+                } => {
+                    self.tx_type = merge_tx_type(self.tx_type, TxType::DecommissionStakePool);
+                    self.increase_input_totals(CoinOrTokenId::Coin, *staker_balance)?;
+                }
+                AdditionalUtxoInfo::Utxo(utxo) => {
+                    match &utxo {
+                        TxOutput::Transfer(value, _)
+                        | TxOutput::LockThenTransfer(value, _, _)
+                        | TxOutput::Htlc(value, _) => {
+                            let (coin_or_token_id, amount) =
+                                into_coin_or_token_id_and_amount(value)?;
+                            self.increase_input_totals(coin_or_token_id, amount)?;
+                        }
+                        TxOutput::Burn(_)
+                        | TxOutput::ProduceBlockFromStake(_, _)
+                        | TxOutput::CreateDelegationId(_, _)
+                        | TxOutput::IssueFungibleToken(_)
+                        | TxOutput::DataDeposit(_)
+                        | TxOutput::DelegateStaking(_, _)
+                        | TxOutput::CreateOrder(_) => return Err(StatusWord::TxInvalidInputUtxo),
+                        TxOutput::CreateStakePool(_, data) => {
+                            self.increase_input_totals(CoinOrTokenId::Coin, data.pledge)?;
+                        }
+                        TxOutput::IssueNft(nft_id, _, _) => {
+                            self.increase_input_totals(
+                                CoinOrTokenId::TokenId(*nft_id),
+                                Amount::from_atoms(1),
+                            )?;
+                        }
+                    };
+                }
+            },
+            TxInputWithAdditionalInfo::Account(acc) => {
+                self.input_command = Some(InputCommand::AccountSpending(acc.spending.clone()));
+                match acc.spending {
+                    AccountSpending::DelegationBalance(_, amount) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::DelegationWithdrawal);
+                        self.increase_input_totals(CoinOrTokenId::Coin, amount)?;
+                    }
+                }
+            }
+            TxInputWithAdditionalInfo::AccountCommand(_, cmd) => {
+                self.input_command = Some(InputCommand::AccountCommand(cmd.clone()));
+                match cmd {
+                    AccountCommand::MintTokens(token_id, amount) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::MintTokens);
+                        self.increase_input_totals(CoinOrTokenId::TokenId(*token_id), *amount)?;
+                    }
+                    AccountCommand::ConcludeOrder(_) | AccountCommand::FillOrder(_, _, _) => {
+                        return Err(StatusWord::OrdersV0NotSupported);
+                    }
+                    AccountCommand::UnmintTokens(_) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::UnmintTokens);
+                    }
+                    AccountCommand::LockTokenSupply(_) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::LockTokenSupply);
+                    }
+                    AccountCommand::FreezeToken(_, _) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::FreezeToken);
+                    }
+                    AccountCommand::UnfreezeToken(_) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::UnfreezeToken);
+                    }
+                    AccountCommand::ChangeTokenAuthority(_, _) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::ChangeTokenAuthority);
+                    }
+                    AccountCommand::ChangeTokenMetadataUri(_, _) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::ChangeTokenMetadataUri);
+                    }
+                }
+            }
+            TxInputWithAdditionalInfo::OrderAccountCommand(cmd, additional_info) => {
+                self.input_command = Some(InputCommand::OrderCommand(
+                    cmd.clone(),
+                    additional_info.clone(),
+                ));
+                match cmd {
+                    OrderAccountCommand::FillOrder(_, fill_amount) => {
+                        let (fill_coin_or_token_id, asked_amount) =
+                            into_coin_or_token_id_and_amount(&additional_info.initially_asked)?;
+                        let (given_coin_or_token_id, given_amount) =
+                            into_coin_or_token_id_and_amount(&additional_info.initially_given)?;
+
+                        self.increase_output_totals(fill_coin_or_token_id, *fill_amount)?;
+
+                        let atoms = given_amount
+                            .into_atoms()
+                            .checked_mul(fill_amount.into_atoms())
+                            .ok_or(StatusWord::TxNumericOperationFail)?
+                            .checked_div(asked_amount.into_atoms())
+                            .ok_or(StatusWord::TxNumericOperationFail)?;
+                        let amount = Amount::from_atoms(atoms);
+                        self.increase_input_totals(given_coin_or_token_id, amount)?;
+
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::FillOrder);
+                    }
+                    OrderAccountCommand::ConcludeOrder(_) => {
+                        let (coin_or_token_id, _) =
+                            into_coin_or_token_id_and_amount(&additional_info.initially_asked)?;
+                        self.increase_input_totals(coin_or_token_id, additional_info.ask_balance)?;
+
+                        let (coin_or_token_id, _) =
+                            into_coin_or_token_id_and_amount(&additional_info.initially_given)?;
+                        self.increase_input_totals(coin_or_token_id, additional_info.give_balance)?;
+
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::ConcludeOrder);
+                    }
+                    OrderAccountCommand::FreezeOrder(_) => {
+                        self.tx_type = merge_tx_type(self.tx_type, TxType::FreezeOrder);
+                    }
+                }
+            }
+        };
+
+        Ok(())
+    }
+
+    fn increase_input_totals(
+        &mut self,
+        key: CoinOrTokenId,
+        amount: Amount,
+    ) -> Result<(), StatusWord> {
+        let total = self
+            .total_inputs
+            .entry(key)
+            .or_insert(Amount::from_atoms(0));
+        let new_total = total
+            .into_atoms()
+            .checked_add(amount.into_atoms())
+            .ok_or(StatusWord::TxNumericOperationFail)?;
+        *total = Amount::from_atoms(new_total);
+        Ok(())
+    }
+
+    fn increase_output_totals(
+        &mut self,
+        key: CoinOrTokenId,
+        amount: Amount,
+    ) -> Result<(), StatusWord> {
+        let total = self
+            .total_outputs
+            .entry(key)
+            .or_insert(Amount::from_atoms(0));
+        let new_total = total
+            .into_atoms()
+            .checked_add(amount.into_atoms())
+            .ok_or(StatusWord::TxNumericOperationFail)?;
+        *total = Amount::from_atoms(new_total);
+        Ok(())
+    }
+}
+
+// TODO: this logic makes the tx type depend on the outputs order:
+// if the outputs are Burn and Transfer, the tx type will be Burn, but if it's Transfer, Burn,
+// then the tx type will be ComplexTransaction.
+// See https://github.com/mintlayer/mintlayer-ledger-app/issues/21.
+fn merge_tx_type(tx_type: Option<TxType>, new_type: TxType) -> Option<TxType> {
+    match tx_type {
+        None => Some(new_type),
+        // Transfers are a lower priority (as they can be change outputs) so keep the previous type
+        Some(_) if new_type == TxType::Transfer => tx_type,
+        Some(_) => Some(TxType::ComplexTransaction),
+    }
+}
+
+fn into_coin_or_token_id_and_amount(
+    value: &OutputValue,
+) -> Result<(CoinOrTokenId, Amount), StatusWord> {
+    match value {
+        OutputValue::Coin(amount) => Ok((CoinOrTokenId::Coin, *amount)),
+        OutputValue::TokenV1(token_id, amount) => Ok((CoinOrTokenId::TokenId(*token_id), *amount)),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use mintlayer_messages::{AdditionalOrderInfo, AdditionalUtxoInfo, TxInputWithAdditionalInfo};
+    use test_utils::prelude::*;
+
+    use crate::{StatusWord, mlcp};
+
+    use super::*;
+
+    fn make_utxo_outpoint() -> mlcp::UtxoOutPoint {
+        mlcp::UtxoOutPoint::new(
+            mlcp::OutPointSourceId::Transaction(mlcp::Id::new(mlcp::H256::zero())),
+            0,
+        )
+    }
+
+    // TODO: these tests can be improved:
+    // 1) Each test should better check everything (total inputs, total outputs, fees, tx type etc),
+    //    even if it's only dealing with one aspect of the summary collector (e.g. tx outputs).
+    // 2) More tests for fee calculation would be nice:
+    //    a) non-trivial successful case;
+    //    b) cases dealing with more than once currency (both successful and not), in particular
+    //       the case where one currency is only present in the total outputs but not total inputs.
+    // 3) Maybe something else.
+    // See https://github.com/mintlayer/mintlayer-ledger-app/issues/15.
+
+    #[test_item]
+    fn test_new_and_getters() {
+        let collector = TxSummaryCollector::new();
+        assert!(collector.tx_type().is_none());
+        assert!(collector.input_command().is_none());
+        assert!(collector.total_inputs().is_empty());
+        assert!(collector.total_outputs().is_empty());
+    }
+
+    #[test_item]
+    fn test_process_output_transfer() {
+        let mut collector = TxSummaryCollector::new();
+
+        // Transfer Coin
+        let coin_amount = mlcp::Amount::from_atoms(100);
+        let out_coin = mlcp::TxOutput::Transfer(
+            mlcp::OutputValue::Coin(coin_amount),
+            mlcp::Destination::AnyoneCanSpend,
+        );
+        collector.process_output(&out_coin).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::Transfer));
+        assert_eq!(
+            collector.total_outputs().get(&CoinOrTokenId::Coin),
+            Some(&coin_amount)
+        );
+
+        // Transfer Token
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let token_amount = mlcp::Amount::from_atoms(200);
+        let out_token = mlcp::TxOutput::Transfer(
+            mlcp::OutputValue::TokenV1(token_id, token_amount),
+            mlcp::Destination::AnyoneCanSpend,
+        );
+        collector.process_output(&out_token).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::Transfer));
+        assert_eq!(
+            collector
+                .total_outputs()
+                .get(&CoinOrTokenId::TokenId(token_id)),
+            Some(&token_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_output_lock_then_transfer() {
+        let mut collector = TxSummaryCollector::new();
+        let amount = mlcp::Amount::from_atoms(150);
+        let out = mlcp::TxOutput::LockThenTransfer(
+            mlcp::OutputValue::Coin(amount),
+            mlcp::Destination::AnyoneCanSpend,
+            mlcp::OutputTimeLock::ForBlockCount(mlcp::BlocksCount(10)),
+        );
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::Transfer));
+        assert_eq!(
+            collector.total_outputs().get(&CoinOrTokenId::Coin),
+            Some(&amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_output_burn() {
+        let mut collector = TxSummaryCollector::new();
+        let burn_amount = mlcp::Amount::from_atoms(50);
+        let out = mlcp::TxOutput::Burn(mlcp::OutputValue::Coin(burn_amount));
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::Burn));
+        assert_eq!(
+            collector.total_outputs().get(&CoinOrTokenId::Coin),
+            Some(&burn_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_output_htlc() {
+        let mut collector = TxSummaryCollector::new();
+        let htlc = mlcp::HashedTimelockContract {
+            secret_hash: [0; 20].into(),
+            spend_key: mlcp::Destination::AnyoneCanSpend,
+            refund_timelock: mlcp::OutputTimeLock::ForBlockCount(mlcp::BlocksCount(10)),
+            refund_key: mlcp::Destination::AnyoneCanSpend,
+        };
+        let htlc_amount = mlcp::Amount::from_atoms(300);
+        let out = mlcp::TxOutput::Htlc(mlcp::OutputValue::Coin(htlc_amount), htlc);
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::Htlc));
+        assert_eq!(
+            collector.total_outputs().get(&CoinOrTokenId::Coin),
+            Some(&htlc_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_output_create_stake_pool() {
+        let mut collector = TxSummaryCollector::new();
+        let pledge_amount = mlcp::Amount::from_atoms(40000);
+        let data = mlcp::StakePoolData {
+            pledge: pledge_amount,
+            staker: mlcp::Destination::AnyoneCanSpend,
+            vrf_public_key: mlcp::VrfPublicKey::Schnorrkel(mlcp::SchnorrkelPublicKey([0; 32])),
+            decommission_key: mlcp::Destination::AnyoneCanSpend,
+            margin_ratio_per_thousand: mlcp::PerThousand(10),
+            cost_per_block: mlcp::Amount::from_atoms(0),
+        };
+        let out = mlcp::TxOutput::CreateStakePool(mlcp::Id::new(mlcp::H256::zero()), data);
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::CreateStakePool));
+        assert_eq!(
+            collector.total_outputs().get(&CoinOrTokenId::Coin),
+            Some(&pledge_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_output_produce_block_from_stake() {
+        let mut collector = TxSummaryCollector::new();
+        let out = mlcp::TxOutput::ProduceBlockFromStake(
+            mlcp::Destination::AnyoneCanSpend,
+            mlcp::Id::new(mlcp::H256::zero()),
+        );
+        collector.process_output(&out).unwrap();
+        // ProduceBlockFromStake is a no-op, tx_type should remain None
+        assert!(collector.tx_type().is_none());
+        assert!(collector.total_outputs().is_empty());
+    }
+
+    #[test_item]
+    fn test_process_output_delegate_staking() {
+        let mut collector = TxSummaryCollector::new();
+        let delegate_amount = mlcp::Amount::from_atoms(500);
+        let out =
+            mlcp::TxOutput::DelegateStaking(delegate_amount, mlcp::Id::new(mlcp::H256::zero()));
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::DelegateStaking));
+        assert_eq!(
+            collector.total_outputs().get(&CoinOrTokenId::Coin),
+            Some(&delegate_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_output_create_delegation_id() {
+        let mut collector = TxSummaryCollector::new();
+        let out = mlcp::TxOutput::CreateDelegationId(
+            mlcp::Destination::AnyoneCanSpend,
+            mlcp::Id::new(mlcp::H256::zero()),
+        );
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::CreateDelegation));
+    }
+
+    #[test_item]
+    fn test_process_output_issue_fungible_token() {
+        let mut collector = TxSummaryCollector::new();
+        let token_issuance = mlcp::TokenIssuance::V1(mlcp::TokenIssuanceV1 {
+            token_ticker: alloc::vec::Vec::new(),
+            number_of_decimals: 8,
+            metadata_uri: alloc::vec::Vec::new(),
+            total_supply: mlcp::TokenTotalSupply::Unlimited,
+            authority: mlcp::Destination::AnyoneCanSpend,
+            is_freezable: mlcp::IsTokenFreezable::No,
+        });
+        let out = mlcp::TxOutput::IssueFungibleToken(token_issuance);
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::CreateToken));
+    }
+
+    #[test_item]
+    fn test_process_output_data_deposit() {
+        let mut collector = TxSummaryCollector::new();
+        let out = mlcp::TxOutput::DataDeposit(alloc::vec::Vec::new());
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::DataDeposit));
+    }
+
+    #[test_item]
+    fn test_process_output_issue_nft() {
+        let mut collector = TxSummaryCollector::new();
+        let nft_issuance = mlcp::NftIssuance::V0(mlcp::NftIssuanceV0 {
+            creator: None,
+            name: alloc::vec::Vec::new(),
+            description: alloc::vec::Vec::new(),
+            ticker: alloc::vec::Vec::new(),
+            icon_uri: alloc::vec::Vec::new(),
+            additional_metadata_uri: alloc::vec::Vec::new(),
+            media_uri: alloc::vec::Vec::new(),
+            media_hash: alloc::vec::Vec::new(),
+        });
+        let out = mlcp::TxOutput::IssueNft(
+            mlcp::Id::new(mlcp::H256::zero()),
+            nft_issuance,
+            mlcp::Destination::AnyoneCanSpend,
+        );
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::CreateNft));
+    }
+
+    #[test_item]
+    fn test_process_output_create_order() {
+        let mut collector = TxSummaryCollector::new();
+        let ask_amount = mlcp::Amount::from_atoms(100);
+        let give_amount = mlcp::Amount::from_atoms(50);
+        let order_data = mlcp::OrderData {
+            conclude_key: mlcp::Destination::AnyoneCanSpend,
+            ask: mlcp::OutputValue::Coin(ask_amount),
+            give: mlcp::OutputValue::Coin(give_amount),
+        };
+        let out = mlcp::TxOutput::CreateOrder(order_data);
+        collector.process_output(&out).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::CreateOrder));
+        assert_eq!(
+            collector.total_outputs().get(&CoinOrTokenId::Coin),
+            Some(&give_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_input_utxo_transfer() {
+        let mut collector = TxSummaryCollector::new();
+
+        let transfer_amount = mlcp::Amount::from_atoms(250);
+        let inp = TxInputWithAdditionalInfo::Utxo(
+            make_utxo_outpoint(),
+            AdditionalUtxoInfo::Utxo(mlcp::TxOutput::Transfer(
+                mlcp::OutputValue::Coin(transfer_amount),
+                mlcp::Destination::AnyoneCanSpend,
+            )),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(
+            collector.total_inputs().get(&CoinOrTokenId::Coin),
+            Some(&transfer_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_input_utxo_lock_then_transfer() {
+        let mut collector = TxSummaryCollector::new();
+
+        let lock_amount = mlcp::Amount::from_atoms(120);
+        let inp = TxInputWithAdditionalInfo::Utxo(
+            make_utxo_outpoint(),
+            AdditionalUtxoInfo::Utxo(mlcp::TxOutput::LockThenTransfer(
+                mlcp::OutputValue::Coin(lock_amount),
+                mlcp::Destination::AnyoneCanSpend,
+                mlcp::OutputTimeLock::ForBlockCount(mlcp::BlocksCount(10)),
+            )),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(
+            collector.total_inputs().get(&CoinOrTokenId::Coin),
+            Some(&lock_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_input_utxo_htlc() {
+        let mut collector = TxSummaryCollector::new();
+        let htlc = mlcp::HashedTimelockContract {
+            secret_hash: [0; 20].into(),
+            spend_key: mlcp::Destination::AnyoneCanSpend,
+            refund_timelock: mlcp::OutputTimeLock::ForBlockCount(mlcp::BlocksCount(10)),
+            refund_key: mlcp::Destination::AnyoneCanSpend,
+        };
+
+        let htlc_amount = mlcp::Amount::from_atoms(80);
+        let inp = TxInputWithAdditionalInfo::Utxo(
+            make_utxo_outpoint(),
+            AdditionalUtxoInfo::Utxo(mlcp::TxOutput::Htlc(
+                mlcp::OutputValue::Coin(htlc_amount),
+                htlc,
+            )),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(
+            collector.total_inputs().get(&CoinOrTokenId::Coin),
+            Some(&htlc_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_input_utxo_create_stake_pool() {
+        let mut collector = TxSummaryCollector::new();
+        let pledge_amount = mlcp::Amount::from_atoms(40000);
+        let data = mlcp::StakePoolData {
+            pledge: pledge_amount,
+            staker: mlcp::Destination::AnyoneCanSpend,
+            vrf_public_key: mlcp::VrfPublicKey::Schnorrkel(mlcp::SchnorrkelPublicKey([0; 32])),
+            decommission_key: mlcp::Destination::AnyoneCanSpend,
+            margin_ratio_per_thousand: mlcp::PerThousand(10),
+            cost_per_block: mlcp::Amount::from_atoms(0),
+        };
+
+        let inp = TxInputWithAdditionalInfo::Utxo(
+            make_utxo_outpoint(),
+            AdditionalUtxoInfo::Utxo(mlcp::TxOutput::CreateStakePool(
+                mlcp::Id::new(mlcp::H256::zero()),
+                data,
+            )),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(
+            collector.total_inputs().get(&CoinOrTokenId::Coin),
+            Some(&pledge_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_input_utxo_issue_nft() {
+        let mut collector = TxSummaryCollector::new();
+        let nft_issuance = mlcp::NftIssuance::V0(mlcp::NftIssuanceV0 {
+            creator: None,
+            name: alloc::vec::Vec::new(),
+            description: alloc::vec::Vec::new(),
+            ticker: alloc::vec::Vec::new(),
+            icon_uri: alloc::vec::Vec::new(),
+            additional_metadata_uri: alloc::vec::Vec::new(),
+            media_uri: alloc::vec::Vec::new(),
+            media_hash: alloc::vec::Vec::new(),
+        });
+        let nft_id = mlcp::Id::new(mlcp::H256::zero());
+
+        let inp = TxInputWithAdditionalInfo::Utxo(
+            make_utxo_outpoint(),
+            AdditionalUtxoInfo::Utxo(mlcp::TxOutput::IssueNft(
+                nft_id,
+                nft_issuance,
+                mlcp::Destination::AnyoneCanSpend,
+            )),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(
+            collector
+                .total_inputs()
+                .get(&CoinOrTokenId::TokenId(nft_id)),
+            Some(&mlcp::Amount::from_atoms(1))
+        );
+    }
+
+    #[test_item]
+    fn test_process_input_utxo_with_pool_data() {
+        let mut collector = TxSummaryCollector::new();
+        let staker_balance_amount = mlcp::Amount::from_atoms(50000);
+        let inp = TxInputWithAdditionalInfo::Utxo(
+            make_utxo_outpoint(),
+            AdditionalUtxoInfo::UtxoWithPoolData {
+                utxo: mlcp::TxOutput::ProduceBlockFromStake(
+                    mlcp::Destination::AnyoneCanSpend,
+                    mlcp::Id::new(mlcp::H256::zero()),
+                ),
+                staker_balance: staker_balance_amount,
+            },
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::DecommissionStakePool));
+        assert_eq!(
+            collector.total_inputs().get(&CoinOrTokenId::Coin),
+            Some(&staker_balance_amount)
+        );
+    }
+
+    #[test_item]
+    fn test_process_input_account() {
+        let mut collector = TxSummaryCollector::new();
+        let delegation_balance = mlcp::Amount::from_atoms(700);
+        let acc = mlcp::AccountOutPoint {
+            nonce: mlcp::AccountNonce(0),
+            spending: mlcp::AccountSpending::DelegationBalance(
+                mlcp::Id::new(mlcp::H256::zero()),
+                delegation_balance,
+            ),
+        };
+        let inp = TxInputWithAdditionalInfo::Account(acc);
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::DelegationWithdrawal));
+        assert_eq!(
+            collector.total_inputs().get(&CoinOrTokenId::Coin),
+            Some(&delegation_balance)
+        );
+        assert!(matches!(
+            collector.input_command(),
+            Some(InputCommand::AccountSpending(
+                mlcp::AccountSpending::DelegationBalance(_, _)
+            ))
+        ));
+    }
+
+    #[test_item]
+    fn test_process_input_account_command_mint() {
+        let mut collector = TxSummaryCollector::new();
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let mint_amount = mlcp::Amount::from_atoms(1000);
+        let inp = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(1),
+            mlcp::AccountCommand::MintTokens(token_id, mint_amount),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::MintTokens));
+        assert_eq!(
+            collector
+                .total_inputs()
+                .get(&CoinOrTokenId::TokenId(token_id)),
+            Some(&mint_amount)
+        );
+        assert!(matches!(
+            collector.input_command(),
+            Some(InputCommand::AccountCommand(
+                mlcp::AccountCommand::MintTokens(_, _)
+            ))
+        ));
+    }
+
+    #[test_item]
+    fn test_process_input_account_command_unmint() {
+        let mut collector = TxSummaryCollector::new();
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let inp = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(2),
+            mlcp::AccountCommand::UnmintTokens(token_id),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::UnmintTokens));
+    }
+
+    #[test_item]
+    fn test_process_input_account_command_lock_token_supply() {
+        let mut collector = TxSummaryCollector::new();
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let inp = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(3),
+            mlcp::AccountCommand::LockTokenSupply(token_id),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::LockTokenSupply));
+    }
+
+    #[test_item]
+    fn test_process_input_account_command_freeze_token() {
+        let mut collector = TxSummaryCollector::new();
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let inp = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(4),
+            mlcp::AccountCommand::FreezeToken(token_id, mlcp::IsTokenUnfreezable::Yes),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::FreezeToken));
+    }
+
+    #[test_item]
+    fn test_process_input_account_command_unfreeze_token() {
+        let mut collector = TxSummaryCollector::new();
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let inp = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(5),
+            mlcp::AccountCommand::UnfreezeToken(token_id),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::UnfreezeToken));
+    }
+
+    #[test_item]
+    fn test_process_input_account_command_change_authority() {
+        let mut collector = TxSummaryCollector::new();
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let inp = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(6),
+            mlcp::AccountCommand::ChangeTokenAuthority(token_id, mlcp::Destination::AnyoneCanSpend),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::ChangeTokenAuthority));
+    }
+
+    #[test_item]
+    fn test_process_input_account_command_change_metadata_uri() {
+        let mut collector = TxSummaryCollector::new();
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let inp = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(7),
+            mlcp::AccountCommand::ChangeTokenMetadataUri(token_id, alloc::vec::Vec::new()),
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::ChangeTokenMetadataUri));
+    }
+
+    #[test_item]
+    fn test_process_input_order_command_fill() {
+        let mut collector = TxSummaryCollector::new();
+        let order_id = mlcp::Id::new(mlcp::H256::zero());
+        let fill_amount = mlcp::Amount::from_atoms(10);
+        let initially_asked = mlcp::Amount::from_atoms(100);
+        let initially_given = mlcp::Amount::from_atoms(200);
+
+        let additional_info = AdditionalOrderInfo {
+            initially_asked: mlcp::OutputValue::Coin(initially_asked),
+            initially_given: mlcp::OutputValue::Coin(initially_given),
+            ask_balance: mlcp::Amount::from_atoms(0),
+            give_balance: mlcp::Amount::from_atoms(0),
+        };
+        let inp = TxInputWithAdditionalInfo::OrderAccountCommand(
+            mlcp::OrderAccountCommand::FillOrder(order_id, fill_amount),
+            additional_info,
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::FillOrder));
+        // Fill order output totals increases by fill_amount (10 coins)
+        assert_eq!(
+            collector.total_outputs().get(&CoinOrTokenId::Coin),
+            Some(&fill_amount)
+        );
+        // Fill order input totals increases by (given_amount * fill_amount / asked_amount)
+        // 200 * 10 / 100 = 20
+        let expected_input_amount = Amount::from_atoms(
+            (initially_given.into_atoms() * fill_amount.into_atoms())
+                / initially_asked.into_atoms(),
+        );
+        assert_eq!(
+            collector.total_inputs().get(&CoinOrTokenId::Coin),
+            Some(&expected_input_amount)
+        );
+        assert!(matches!(
+            collector.input_command(),
+            Some(InputCommand::OrderCommand(
+                mlcp::OrderAccountCommand::FillOrder(_, _),
+                AdditionalOrderInfo { .. }
+            ))
+        ));
+    }
+
+    #[test_item]
+    fn test_process_input_order_command_conclude() {
+        let mut collector = TxSummaryCollector::new();
+        let order_id = mlcp::Id::new(mlcp::H256::zero());
+        let ask_balance = mlcp::Amount::from_atoms(30);
+        let give_balance = mlcp::Amount::from_atoms(60);
+        let token_id = mlcp::Id::new(mlcp::H256::zero());
+        let additional_info = AdditionalOrderInfo {
+            initially_asked: mlcp::OutputValue::Coin(mlcp::Amount::from_atoms(100)),
+            initially_given: mlcp::OutputValue::TokenV1(token_id, mlcp::Amount::from_atoms(200)),
+            ask_balance,
+            give_balance,
+        };
+        let inp = TxInputWithAdditionalInfo::OrderAccountCommand(
+            mlcp::OrderAccountCommand::ConcludeOrder(order_id),
+            additional_info,
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::ConcludeOrder));
+        // Conclude order increases inputs by ask_balance and give_balance
+        assert_eq!(
+            collector.total_inputs().get(&CoinOrTokenId::Coin),
+            Some(&ask_balance)
+        );
+        assert_eq!(
+            collector
+                .total_inputs()
+                .get(&CoinOrTokenId::TokenId(token_id)),
+            Some(&give_balance)
+        );
+    }
+
+    #[test_item]
+    fn test_process_input_order_command_freeze() {
+        let mut collector = TxSummaryCollector::new();
+        let order_id = mlcp::Id::new(mlcp::H256::zero());
+        let additional_info = AdditionalOrderInfo {
+            initially_asked: mlcp::OutputValue::Coin(mlcp::Amount::from_atoms(100)),
+            initially_given: mlcp::OutputValue::Coin(mlcp::Amount::from_atoms(200)),
+            ask_balance: mlcp::Amount::from_atoms(0),
+            give_balance: mlcp::Amount::from_atoms(0),
+        };
+        let inp = TxInputWithAdditionalInfo::OrderAccountCommand(
+            mlcp::OrderAccountCommand::FreezeOrder(order_id),
+            additional_info,
+        );
+        collector.process_input(&inp).unwrap();
+        assert_eq!(collector.tx_type(), Some(TxType::FreezeOrder));
+    }
+
+    #[test_item]
+    fn test_process_input_errors() {
+        let mut collector = TxSummaryCollector::new();
+
+        // 1. Burn output as input UTXO is invalid
+        let inp_burn = TxInputWithAdditionalInfo::Utxo(
+            make_utxo_outpoint(),
+            AdditionalUtxoInfo::Utxo(mlcp::TxOutput::Burn(mlcp::OutputValue::Coin(
+                mlcp::Amount::from_atoms(100),
+            ))),
+        );
+        assert_eq!(
+            collector.process_input(&inp_burn).unwrap_err(),
+            StatusWord::TxInvalidInputUtxo
+        );
+
+        // 2. OrdersV0NotSupported in AccountCommand
+        let inp_conclude_v0 = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(8),
+            mlcp::AccountCommand::ConcludeOrder(mlcp::Id::new(mlcp::H256::zero())),
+        );
+        assert_eq!(
+            collector.process_input(&inp_conclude_v0).unwrap_err(),
+            StatusWord::OrdersV0NotSupported
+        );
+
+        let inp_fill_v0 = TxInputWithAdditionalInfo::AccountCommand(
+            mlcp::AccountNonce(9),
+            mlcp::AccountCommand::FillOrder(
+                mlcp::Id::new(mlcp::H256::zero()),
+                mlcp::Amount::from_atoms(100),
+                mlcp::Destination::AnyoneCanSpend,
+            ),
+        );
+        assert_eq!(
+            collector.process_input(&inp_fill_v0).unwrap_err(),
+            StatusWord::OrdersV0NotSupported
+        );
+    }
+
+    #[test_item]
+    fn test_tx_type_merging() {
+        assert_eq!(
+            merge_tx_type(None, TxType::Transfer),
+            Some(TxType::Transfer)
+        );
+        assert_eq!(
+            merge_tx_type(Some(TxType::Transfer), TxType::Transfer),
+            Some(TxType::Transfer)
+        );
+        assert_eq!(
+            merge_tx_type(Some(TxType::Burn), TxType::Transfer),
+            Some(TxType::Burn)
+        );
+        assert_eq!(
+            merge_tx_type(Some(TxType::Burn), TxType::Htlc),
+            Some(TxType::ComplexTransaction)
+        );
+    }
+
+    #[test_item]
+    fn test_fees_calculation_overflow_and_underflow() {
+        let mut collector = TxSummaryCollector::new();
+
+        // Underflow: out (120) > inp (100)
+        collector
+            .total_inputs
+            .insert(CoinOrTokenId::Coin, mlcp::Amount::from_atoms(100));
+        collector
+            .total_outputs
+            .insert(CoinOrTokenId::Coin, mlcp::Amount::from_atoms(120));
+        let fees_res = collector.fees_iter().next().unwrap();
+        assert_eq!(fees_res.unwrap_err(), StatusWord::TxFeeUnderflow);
+
+        // Numeric overflow in increase_input_totals
+        let mut collector = TxSummaryCollector::new();
+        collector
+            .increase_input_totals(CoinOrTokenId::Coin, mlcp::Amount::from_atoms(u128::MAX))
+            .unwrap();
+        assert_eq!(
+            collector
+                .increase_input_totals(CoinOrTokenId::Coin, mlcp::Amount::from_atoms(1))
+                .unwrap_err(),
+            StatusWord::TxNumericOperationFail
+        );
+
+        // Numeric overflow in increase_output_totals
+        let mut collector = TxSummaryCollector::new();
+        collector
+            .increase_output_totals(CoinOrTokenId::Coin, mlcp::Amount::from_atoms(u128::MAX))
+            .unwrap();
+        assert_eq!(
+            collector
+                .increase_output_totals(CoinOrTokenId::Coin, mlcp::Amount::from_atoms(1))
+                .unwrap_err(),
+            StatusWord::TxNumericOperationFail
+        );
+    }
+}
diff --git a/crates/app-core/src/hasher.rs b/crates/app-core/src/hasher.rs
new file mode 100644
index 0000000..85932b4
--- /dev/null
+++ b/crates/app-core/src/hasher.rs
@@ -0,0 +1,75 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use crate::StatusWord;
+
+use mintlayer_messages::{H256, parity_scale_codec};
+
+use ledger_device_sdk::hash::{HashInit, blake2::Blake2b_512};
+
+/// The hasher that produces Mintlayer-specific hashes.
+///
+/// Note: we want to implement `parity_scale_codec::Output` for `Hasher`, which means that
+/// its `update` method has to be infallible. But we don't want to `expect` on errors, so
+/// on failure we just set `update_failed` to true, which will then cause `finalize` to fail.
+pub struct Hasher {
+    hasher: Blake2b_512,
+    update_failed: bool,
+}
+
+impl Hasher {
+    pub fn new() -> Self {
+        Self {
+            hasher: Blake2b_512::new(),
+            update_failed: false,
+        }
+    }
+
+    pub fn update(&mut self, input: &[u8]) {
+        if self.update_failed {
+            return;
+        }
+
+        if self.hasher.update(input).is_err() {
+            self.update_failed = true;
+        }
+    }
+
+    pub fn finalize(mut self) -> Result<H256, StatusWord> {
+        if self.update_failed {
+            return Err(StatusWord::HashFail);
+        }
+
+        let mut hash: [u8; 64] = [0u8; 64];
+        self.hasher
+            .finalize(&mut hash)
+            .map_err(|_| StatusWord::HashFail)?;
+        Ok(H256::from_slice(&hash[..32]))
+    }
+
+    pub fn hash(input: &[u8]) -> Result<H256, StatusWord> {
+        let mut hasher = Self::new();
+        hasher.update(input);
+        hasher.finalize()
+    }
+}
+
+impl parity_scale_codec::Output for Hasher {
+    fn write(&mut self, bytes: &[u8]) {
+        self.update(bytes)
+    }
+}
diff --git a/crates/app-core/src/lib.rs b/crates/app-core/src/lib.rs
new file mode 100644
index 0000000..8b8f2cd
--- /dev/null
+++ b/crates/app-core/src/lib.rs
@@ -0,0 +1,372 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2023 Ledger SAS.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+#![no_std]
+// See the comment in `crates/test-utils/src/lib.rs` for the meaning of these attributes.
+#![cfg_attr(test, no_main)]
+#![feature(custom_test_frameworks)]
+#![test_runner(ledger_device_sdk::testing::sdk_test_runner)]
+#![reexport_test_harness_main = "test_main"]
+
+#[cfg(test)]
+test_utils::impl_panic_handler!();
+#[cfg(test)]
+test_utils::impl_main!();
+
+mod app_ui;
+mod errors;
+mod handlers;
+mod hasher;
+mod utils;
+
+// Required for using String, Vec, format!...
+extern crate alloc;
+use alloc::vec::Vec;
+
+use ledger_device_sdk::{
+    io::{ApduHeader, Comm, Reply},
+    nbgl::{NbglHomeAndSettings, NbglReviewStatus, NbglStreamingReview, StatusType, init_comm},
+};
+
+use mintlayer_core_primitives as mlcp;
+
+use mintlayer_messages::{
+    APDU_CLASS, GetPubKeyP1, Ins, MAX_APDU_DATA_LEN, PingP1, Response, SignMsgP1, SignTxP1,
+    StatusWord, decode_all, encode,
+};
+
+use self::{
+    app_ui::menu::ui_menu_main,
+    errors::sdk_err_to_status,
+    handlers::{
+        get_public_key::handle_get_public_key,
+        sign_message::{SignMessageContext, handle_sign_message, setup_sign_message},
+        sign_tx::{TxProcessingContext, handle_sign_tx, setup_sign_tx},
+    },
+};
+
+/// 16 max APDUs (= 4080 bytes) was chosen because:
+/// * it should be enough to hold our biggest TxOutput (IssueNft with max possible URIs and other
+///   fields will be slightly bigger than 3Kb);
+/// * a buffer bigger than this will likely lead to OOM and crash (reallocating a 4Kb Vec will
+///   temporarily consume 8Kb of RAM, which is half of the entire available Rust heap, see HEAP_SIZE
+///   in .cargo/config.toml).
+pub const MAX_BUFFER_LEN: usize = 16 * MAX_APDU_DATA_LEN;
+
+/// Represents a fully assembled Low-Level Instruction.
+/// Contains the aggregated data from one or more APDUs (if P2 indicated more data).
+pub struct RawInstruction {
+    pub ins: u8,
+    pub p1: u8,
+    pub data: Vec<u8>,
+}
+
+pub enum ReceiveInstructionResult {
+    ExpectingNextChunk,
+    Instruction(RawInstruction),
+}
+
+/// State machine to handle APDU packet chaining (P2_MORE / P2_DONE).
+pub struct ApduTransport {
+    buffer: Vec<u8>,
+    current_ins: Option<u8>,
+    current_p1: Option<u8>,
+}
+
+impl Default for ApduTransport {
+    fn default() -> Self {
+        Self {
+            buffer: Vec::with_capacity(u8::MAX as usize), // Pre-alloc for at least one standard APDU
+            current_ins: None,
+            current_p1: None,
+        }
+    }
+}
+
+impl ApduTransport {
+    /// Reads the next APDU from `comm`.
+    ///
+    /// - If `P2 == P2_MORE`, it accumulates the data and returns `Ok(None)`.
+    ///   It also sends a `StatusWord::Ok` to the host to request the next chunk.
+    /// - If `P2 == P2_DONE`, it finishes accumulation and returns `Ok(Some(RawInstruction))`.
+    pub fn receive(&mut self, comm: &mut Comm) -> Result<ReceiveInstructionResult, StatusWord> {
+        let header: ApduHeader = comm.next_command();
+        let data = comm.get_data().map_err(sdk_err_to_status)?;
+
+        // Validation: If we are in the middle of a stream, INS and P1 must match
+        if let (Some(curr_ins), Some(curr_p1)) = (self.current_ins, self.current_p1) {
+            if header.ins != curr_ins {
+                self.reset();
+                return Err(StatusWord::WrongInstruction);
+            }
+            if header.p1 != curr_p1 {
+                self.reset();
+                return Err(StatusWord::WrongP1P2);
+            }
+        } else {
+            // New command sequence starting
+            self.current_ins = Some(header.ins);
+            self.current_p1 = Some(header.p1);
+        }
+
+        if self.buffer.len() + data.len() > MAX_BUFFER_LEN {
+            self.reset();
+            return Err(StatusWord::MaxBufferLenExceeded);
+        }
+
+        self.buffer.extend_from_slice(data);
+
+        match header.p2 {
+            mintlayer_messages::P2_MORE => Ok(ReceiveInstructionResult::ExpectingNextChunk),
+            mintlayer_messages::P2_DONE => {
+                // Construct the full instruction
+                let raw = RawInstruction {
+                    ins: header.ins,
+                    p1: header.p1,
+                    data: core::mem::take(&mut self.buffer),
+                };
+                self.reset();
+                Ok(ReceiveInstructionResult::Instruction(raw))
+            }
+            _ => {
+                self.reset();
+                Err(StatusWord::WrongP1P2)
+            }
+        }
+    }
+
+    fn reset(&mut self) {
+        self.buffer.clear();
+        self.current_ins = None;
+        self.current_p1 = None;
+    }
+}
+
+pub enum Command {
+    GetPubKey { p1: GetPubKeyP1, data: Vec<u8> },
+    SignTx { p1: SignTxP1, data: Vec<u8> },
+    SignMessage { p1: SignMsgP1, data: Vec<u8> },
+    Ping,
+}
+
+impl TryFrom<RawInstruction> for Command {
+    type Error = StatusWord;
+
+    fn try_from(raw: RawInstruction) -> Result<Self, Self::Error> {
+        match raw.ins {
+            Ins::GET_PUB_KEY => {
+                let p1: GetPubKeyP1 = raw.p1.try_into()?;
+                Ok(Command::GetPubKey { p1, data: raw.data })
+            }
+            Ins::SIGN_TX => {
+                let p1: SignTxP1 = raw.p1.try_into()?;
+                Ok(Command::SignTx { p1, data: raw.data })
+            }
+            Ins::SIGN_MSG => {
+                let p1: SignMsgP1 = raw.p1.try_into()?;
+                Ok(Command::SignMessage { p1, data: raw.data })
+            }
+            Ins::PING => {
+                let _p1: PingP1 = raw.p1.try_into()?;
+
+                // Ping doesn't have any associated data.
+                if !raw.data.is_empty() {
+                    Err(StatusWord::InvalidData)
+                } else {
+                    Ok(Command::Ping)
+                }
+            }
+            _ => Err(StatusWord::InsNotSupported),
+        }
+    }
+}
+
+fn show_status_and_home_if_needed(cmd: &Command, ctx: &mut AppContext, status: StatusWord) {
+    let (show_status, status_type) = match (cmd, status) {
+        (Command::GetPubKey { p1, .. }, StatusWord::Deny | StatusWord::Ok) if p1.display() => {
+            (true, StatusType::Address)
+        }
+        (Command::SignTx { .. }, StatusWord::Deny | StatusWord::Ok) if ctx.finished() => {
+            (true, StatusType::Transaction)
+        }
+        (Command::SignMessage { .. }, StatusWord::Deny | StatusWord::Ok) if ctx.finished() => {
+            (true, StatusType::Message)
+        }
+        (Command::Ping, StatusWord::Ok) => {
+            ctx.home.show_and_return();
+            return;
+        }
+        (_, _) => (false, StatusType::Transaction), // Default fallback
+    };
+
+    if show_status {
+        let success = status == StatusWord::Ok;
+        NbglReviewStatus::new()
+            .status_type(status_type)
+            .show(success);
+
+        // call home.show_and_return() to show home and setting screen
+        ctx.home.show_and_return();
+    }
+}
+
+pub enum DataContext {
+    TxContext(TxProcessingContext, NbglStreamingReview),
+    SignMessageContext(SignMessageContext),
+}
+
+struct AppContext {
+    pub data_context: Option<DataContext>,
+    pub home: NbglHomeAndSettings,
+}
+
+impl AppContext {
+    fn new() -> Self {
+        Self {
+            data_context: None,
+            home: Default::default(),
+        }
+    }
+
+    fn finished(&self) -> bool {
+        self.data_context.as_ref().is_some_and(|ctx| match ctx {
+            DataContext::SignMessageContext(ctx) => ctx.finished(),
+            DataContext::TxContext(ctx, _) => ctx.finished(),
+        })
+    }
+}
+
+pub fn mintlayer_main() {
+    let mut comm = Comm::new().set_expected_cla(APDU_CLASS);
+
+    let mut app_ctx = AppContext::new();
+
+    // Initialize reference to Comm instance for NBGL API calls.
+    init_comm(&mut comm);
+    app_ctx.home = ui_menu_main();
+    app_ctx.home.show_and_return();
+
+    let mut transport = ApduTransport::default();
+
+    loop {
+        let raw_instruction = match transport.receive(&mut comm) {
+            Ok(ReceiveInstructionResult::Instruction(raw)) => raw,
+            Ok(ReceiveInstructionResult::ExpectingNextChunk) => {
+                // Signal host that we received the chunk and are waiting for more
+                comm.append(&encode(Response::ExpectingNextChunk));
+                comm.reply(Reply(StatusWord::Ok as u16));
+                continue; // Waiting for more chunks, loop around
+            }
+            Err(sw) => {
+                comm.reply(Reply(sw as u16));
+                continue;
+            }
+        };
+
+        let command = match Command::try_from(raw_instruction) {
+            Ok(cmd) => cmd,
+            Err(sw) => {
+                comm.reply(Reply(sw as u16));
+                continue;
+            }
+        };
+
+        let status = match handle_command(&command, &mut app_ctx) {
+            Ok(response) => {
+                comm.append(&encode(response));
+                comm.reply_ok();
+                StatusWord::Ok
+            }
+            Err(sw) => {
+                comm.reply(Reply(sw as u16));
+                sw
+            }
+        };
+
+        show_status_and_home_if_needed(&command, &mut app_ctx, status);
+    }
+}
+
+// TODO:
+// 1) On all errors, the context should probably be reset.
+// 2) Note that the simple `ctx.data_context = None` doesn't reset the UI, while `show_status_and_home_if_needed`
+//    doesn't reset the UI on any error.
+// See https://github.com/mintlayer/mintlayer-ledger-app/issues/12.
+// Also see the TODO inside the function.
+fn handle_command(cmd: &Command, ctx: &mut AppContext) -> Result<Response, StatusWord> {
+    match cmd {
+        Command::GetPubKey { p1, data } => {
+            // TODO: the context should be reset here, especially if `display` is true.
+            // Note that `show_status_and_home_if_needed` calls `ctx.home.show_and_return()`
+            // on Pings, so:
+            // a) the context should be reset on Command::Ping below as well,
+            // b) since a Ping resets the context, then GetPubKey should do it even if `display`
+            //    is false;
+            // c) Command::SignMessage below should also reset the context when it's done.
+            // In any case, it's better to put UI update (at least on success) in the same place where
+            // the context is changed.
+            let req = decode_all(data).ok_or(StatusWord::DeserializeFail)?;
+            handle_get_public_key(req, p1.display()).map(Response::PublicKey)
+        }
+        Command::SignTx { p1, data } => match p1 {
+            SignTxP1::Start => {
+                let req = decode_all(data).ok_or(StatusWord::DeserializeFail)?;
+                ctx.data_context = Some(setup_sign_tx(req)?);
+                Ok(Response::TxSetup)
+            }
+            SignTxP1::Next => {
+                let (mut tx_ctx, mut review) = match ctx.data_context.take() {
+                    Some(DataContext::TxContext(c, r)) => (c, r),
+                    _ => return Err(StatusWord::WrongContext),
+                };
+
+                let req = decode_all(data).ok_or(StatusWord::DeserializeFail)?;
+
+                // TODO: it makes sense to drop `data` right after decoding, to free the memory.
+
+                tx_ctx.show_spinner();
+
+                match handle_sign_tx(req, tx_ctx, &mut review) {
+                    Ok((response, new_ctx)) => {
+                        ctx.data_context = Some(DataContext::TxContext(new_ctx, review));
+                        Ok(response)
+                    }
+                    Err(sw) => {
+                        ctx.data_context = None;
+                        Err(sw)
+                    }
+                }
+            }
+        },
+        Command::SignMessage { p1, data } => match p1 {
+            SignMsgP1::Start => {
+                let req = decode_all(data).ok_or(StatusWord::DeserializeFail)?;
+                ctx.data_context = Some(setup_sign_message(req)?);
+                Ok(Response::MessageSetup)
+            }
+            SignMsgP1::Next => {
+                let msg_ctx = match ctx.data_context.as_mut() {
+                    Some(DataContext::SignMessageContext(ctx)) => ctx,
+                    _ => return Err(StatusWord::WrongContext),
+                };
+                handle_sign_message(data, msg_ctx).map(Response::MessageSignature)
+            }
+        },
+        Command::Ping => Ok(Response::Pong),
+    }
+}
diff --git a/crates/app-core/src/utils.rs b/crates/app-core/src/utils.rs
new file mode 100644
index 0000000..e9a4f3c
--- /dev/null
+++ b/crates/app-core/src/utils.rs
@@ -0,0 +1,216 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use alloc::{borrow::Cow, format};
+use core::fmt;
+
+use mintlayer_messages::{Amount, OutputValue, StatusWord};
+
+use crate::mlcp;
+
+const DERIV_PATH_IDX_BIP44: usize = 0;
+const DERIV_PATH_IDX_COIN_TYPE: usize = 1;
+const DERIV_PATH_IDX_ACCOUNT_IDX: usize = 2;
+const DERIV_PATH_IDX_ADDR_PURPOSE: usize = 3;
+const DERIV_PATH_IDX_ADDR_IDX: usize = 4;
+
+// Path should be at least [bip44, coin_type, account_index]
+const DERIV_PATH_MIN_LEN: usize = 3;
+// For tx signing the path should also contain the purpose and the index.
+const DERIV_PATH_LEN_FOR_TX_SIGNING: usize = 5;
+
+const DERIV_PATH_BIP44_ITEM: u32 = 44 + (1 << 31);
+
+pub fn check_derivation_path(path: &[u32], coin_type: mlcp::CoinType) -> Result<(), StatusWord> {
+    if path.len() < DERIV_PATH_MIN_LEN {
+        return Err(StatusWord::InvalidPath);
+    }
+
+    if path[DERIV_PATH_IDX_BIP44] != DERIV_PATH_BIP44_ITEM {
+        return Err(StatusWord::InvalidPath);
+    }
+
+    if path[DERIV_PATH_IDX_COIN_TYPE] != coin_type.bip44_coin_type() {
+        return Err(StatusWord::InvalidPath);
+    }
+
+    Ok(())
+}
+
+pub fn check_derivation_path_for_tx_signing(
+    path: &[u32],
+    coin_type: mlcp::CoinType,
+) -> Result<CompressedDerivationPathForTxSigning, StatusWord> {
+    check_derivation_path(path, coin_type)?;
+
+    if path.len() != DERIV_PATH_LEN_FOR_TX_SIGNING {
+        return Err(StatusWord::InvalidPath);
+    }
+
+    Ok(CompressedDerivationPathForTxSigning {
+        account_index: path[DERIV_PATH_IDX_ACCOUNT_IDX],
+        addr_purpose: path[DERIV_PATH_IDX_ADDR_PURPOSE],
+        addr_index: path[DERIV_PATH_IDX_ADDR_IDX],
+    })
+}
+
+pub struct CompressedDerivationPathForTxSigning {
+    pub account_index: u32,
+    pub addr_purpose: u32,
+    pub addr_index: u32,
+}
+
+impl CompressedDerivationPathForTxSigning {
+    pub fn to_full_path(&self, coin_type: mlcp::CoinType) -> [u32; DERIV_PATH_LEN_FOR_TX_SIGNING] {
+        [
+            DERIV_PATH_BIP44_ITEM,
+            coin_type.bip44_coin_type(),
+            self.account_index,
+            self.addr_purpose,
+            self.addr_index,
+        ]
+    }
+}
+
+/// Cut an array of Copy types to a smaller size.
+///
+/// Fail at compile time if the destination size is bigger than the original.
+pub fn cut_array<T, const ORIG_SIZE: usize, const DEST_SIZE: usize>(
+    orig: &[T; ORIG_SIZE],
+) -> [T; DEST_SIZE]
+where
+    T: Default + Copy,
+{
+    const { assert!(DEST_SIZE <= ORIG_SIZE) };
+
+    let mut result = [T::default(); DEST_SIZE];
+    result.copy_from_slice(&orig[..DEST_SIZE]);
+    result
+}
+
+/// If `bytes` consists of only "displayable" ASCII chars, return the ASCII string directly
+/// in the borrowed form.
+/// Otherwise return hex-encode bytes as a newly allocated string.
+pub fn make_displayable_str(bytes: &[u8]) -> Cow<'_, str> {
+    if let Some(s) = as_displayable_chars(bytes) {
+        Cow::Borrowed(s)
+    } else {
+        Cow::Owned(format!("{:#x}", const_hex::display(bytes)))
+    }
+}
+
+/// This is similar to `make_displayable_str`, but instead of returning a string it returns
+/// an object that will produce the string during formatting.
+///
+/// This should be preferred to `make_displayable_str` if the result has to be passed to
+/// `format!` anyway, because it should result in fewer reallocations.
+pub fn make_displayable<'a>(bytes: &'a [u8]) -> impl fmt::Display + 'a {
+    if let Some(s) = as_displayable_chars(bytes) {
+        DisplayableMessage::Str(s)
+    } else {
+        DisplayableMessage::Hex(bytes)
+    }
+}
+
+enum DisplayableMessage<'a> {
+    Str(&'a str),
+    Hex(&'a [u8]),
+}
+
+impl<'a> fmt::Display for DisplayableMessage<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Str(s) => f.write_str(s),
+            Self::Hex(bytes) => {
+                write!(f, "{:#x}", const_hex::display(bytes))
+            }
+        }
+    }
+}
+
+fn as_displayable_chars(bytes: &[u8]) -> Option<&'_ str> {
+    let as_str = core::str::from_utf8(bytes).ok()?;
+    as_str
+        .bytes()
+        .all(|b| (0x20..=0x7E).contains(&b))
+        .then_some(as_str)
+}
+
+pub fn output_value_with_amount(value: &OutputValue, amount: Amount) -> OutputValue {
+    match value {
+        OutputValue::Coin(_) => OutputValue::Coin(amount),
+        OutputValue::TokenV1(token_id, _) => OutputValue::TokenV1(*token_id, amount),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use test_utils::prelude::*;
+
+    use super::*;
+
+    #[test_item]
+    fn test_make_displayable() {
+        // ASCII displayable string.
+        {
+            let data = "qwe123".as_bytes();
+            let expected_res = "qwe123";
+
+            let res = make_displayable_str(data);
+            assert_eq!(res, expected_res);
+
+            let res = format!("{}", make_displayable(data));
+            assert_eq!(res, expected_res);
+        }
+
+        // ASCII non-displayable string.
+        {
+            let data = "qwe\t123".as_bytes();
+            let expected_res = "0x71776509313233";
+
+            let res = make_displayable_str(data);
+            assert_eq!(res, expected_res);
+
+            let res = format!("{}", make_displayable(data));
+            assert_eq!(res, expected_res);
+        }
+
+        // Non-ASCII string.
+        {
+            let data = "今日は".as_bytes();
+            let expected_res = "0xe4bb8ae697a5e381af";
+
+            let res = make_displayable_str(data);
+            assert_eq!(res, expected_res);
+
+            let res = format!("{}", make_displayable(data));
+            assert_eq!(res, expected_res);
+        }
+
+        // Not a string.
+        {
+            let data = [0xAA, 0xBB, 0xCC];
+            let expected_res = "0xaabbcc";
+
+            let res = make_displayable_str(&data);
+            assert_eq!(res, expected_res);
+
+            let res = format!("{}", make_displayable(&data));
+            assert_eq!(res, expected_res);
+        }
+    }
+}
diff --git a/crates/messages/Cargo.toml b/crates/messages/Cargo.toml
new file mode 100644
index 0000000..438ef1e
--- /dev/null
+++ b/crates/messages/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "mintlayer-messages"
+version.workspace = true
+edition = "2024"
+
+[dependencies]
+derive_more = { workspace = true, default-features = false, features = ["display"]}
+num_enum = { workspace = true, default-features = false }
+num-traits = { workspace = true, default-features = false }
+# Note: normally we would enable the "chain-error" feature of parity-scale-codec to make decode errors
+# more informative. But in the Ledger app we never examine or even print those errors, so enabling this
+# feature would only increase the size of the binary and make the app use more stack during decoding.
+parity-scale-codec = { workspace = true, default-features = false, features = ["derive"] }
+
+mintlayer-core-primitives.workspace = true
+
+[dev-dependencies]
+ledger_device_sdk.workspace = true
+
+test-utils.workspace = true
diff --git a/crates/messages/src/lib.rs b/crates/messages/src/lib.rs
new file mode 100644
index 0000000..5aa632c
--- /dev/null
+++ b/crates/messages/src/lib.rs
@@ -0,0 +1,624 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+#![no_std]
+// See the comment in `crates/test-utils/src/lib.rs` for the meaning of these attributes.
+#![cfg_attr(test, no_main)]
+#![feature(custom_test_frameworks)]
+#![test_runner(ledger_device_sdk::testing::sdk_test_runner)]
+#![reexport_test_harness_main = "test_main"]
+
+#[cfg(test)]
+test_utils::impl_panic_handler!();
+#[cfg(test)]
+test_utils::impl_main!();
+
+#[cfg(test)]
+mod tests;
+
+// TODO: need tests that ensure encoding stability - encode a certain message or a message part and
+// expect concrete bytes, decode it back, expect the same object.
+// See https://github.com/mintlayer/mintlayer-ledger-app/issues/16.
+
+// TODO: types from mintlayer core primitives should probably not be used as part of the protocol
+// (but note that this will increase the size of the binary slightly - a test attempt at using distinct
+// types increased the binary from ~100Kb to ~106Kb).
+// Alternatively, we may want to keep some basic mlcp types in the protocol (the primitives that
+// won't ever change). Though note that we'll have to have a separate type for Destination if we
+// want to be able to detect change addresses, so all types that contain Destination will have to
+// be distinct as well.
+// See https://github.com/mintlayer/mintlayer-ledger-app/issues/18.
+// Also see the TODO in `tests/application_client/__init__.py`.
+
+// Required for using String, Vec, format!...
+extern crate alloc;
+
+use alloc::{boxed::Box, vec::Vec};
+use core::iter::ExactSizeIterator;
+
+use derive_more::Display;
+use mintlayer_core_primitives as mlcp;
+use num_enum::{IntoPrimitive, TryFromPrimitive};
+use parity_scale_codec::{Decode, DecodeAll};
+
+pub use parity_scale_codec::{self, Encode};
+
+pub use mlcp::{
+    AccountCommand, AccountNonce, AccountOutPoint, AccountSpending, Amount, BlockHeight,
+    BlockTimestamp, BlocksCount, DelegationId, Destination, GenBlockId, H256,
+    HashedTimelockContract, IsTokenFreezable, IsTokenUnfreezable, NftIssuance, OrderAccountCommand,
+    OrderData, OrderId, OutPointSourceId, OutputTimeLock, OutputValue, PerThousand, PoolId,
+    PublicKey, PublicKeyHash, ScriptId, SecondsCount, Secp256k1PublicKey, SighashInputCommitment,
+    StakePoolData, TokenId, TokenIssuance, TokenTotalSupply, TransactionId, TxInput, TxOutput,
+    UtxoOutPoint, VrfPublicKey,
+};
+
+pub const APDU_CLASS: u8 = 0xE1;
+pub const MAX_APDU_DATA_LEN: usize = u8::MAX as usize;
+
+// P2 is used to indicate APDU chunking.
+// `P2_DONE` marks the final chunk, while `P2_MORE` indicates that more chunks follow.
+pub const P2_DONE: u8 = 0x00;
+pub const P2_MORE: u8 = 0x80;
+
+fn wrong_p1p2(_: u8) -> StatusWord {
+    StatusWord::WrongP1P2
+}
+
+pub struct Ins {}
+
+impl Ins {
+    pub const GET_PUB_KEY: u8 = 0x00;
+    pub const SIGN_TX: u8 = 0x01;
+    pub const SIGN_MSG: u8 = 0x02;
+    pub const PING: u8 = 0x03;
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, TryFromPrimitive, IntoPrimitive)]
+#[num_enum(error_type(name = StatusWord, constructor = wrong_p1p2))]
+#[repr(u8)]
+pub enum GetPubKeyP1 {
+    NoDisplayAddress = 0,
+    DisplayAddress = 1,
+}
+
+impl GetPubKeyP1 {
+    pub fn display(&self) -> bool {
+        *self == Self::DisplayAddress
+    }
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, TryFromPrimitive, IntoPrimitive)]
+#[num_enum(error_type(name = StatusWord, constructor = wrong_p1p2))]
+#[repr(u8)]
+pub enum SignTxP1 {
+    Start = 0,
+    Next = 1,
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, TryFromPrimitive, IntoPrimitive)]
+#[num_enum(error_type(name = StatusWord, constructor = wrong_p1p2))]
+#[repr(u8)]
+pub enum SignMsgP1 {
+    Start = 0,
+    Next = 1,
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, TryFromPrimitive, IntoPrimitive)]
+#[num_enum(error_type(name = StatusWord, constructor = wrong_p1p2))]
+#[repr(u8)]
+pub enum PingP1 {
+    // Ping doesn't have parameters, so its P1 must always be zero.
+    Dummy = 0,
+}
+
+#[derive(Encode, Decode)]
+pub struct GetPubKeyReq {
+    pub coin_type: CoinType,
+    pub path: Bip32Path,
+}
+
+#[derive(Encode, Decode)]
+pub struct SignMessageStartReq {
+    pub coin: CoinType,
+    pub addr_type: AddrType,
+    pub path: Bip32Path,
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Encode, Decode)]
+#[repr(u8)]
+pub enum TransactionVersion {
+    #[codec(index = 0)]
+    V1,
+}
+
+#[derive(Encode, Decode)]
+pub struct SignTxStartReq {
+    pub coin: CoinType,
+    pub version: TransactionVersion,
+    pub num_inputs: u32,
+    pub num_outputs: u32,
+}
+
+#[derive(Encode, Decode)]
+pub enum SignTxNextReq {
+    #[codec(index = 0)]
+    ProcessInput(Box<TxInputData>),
+
+    #[codec(index = 1)]
+    ProcessInputCommitment(Box<TxInputCommitmentData>),
+
+    #[codec(index = 2)]
+    ProcessOutput(Box<TxOutputData>),
+
+    #[codec(index = 3)]
+    ReturnNextSignature,
+}
+
+// Note:
+// 1) `addresses` can contain multiple entries in the case of multisig or no entries at all in
+//    the case of a non-signable pseudo-input (at this moment FillOrder is the only possible
+//    pseudo-input).
+// 2) Derivation paths in `addresses` are not checked against the actual destinations that the
+//    consensus requires the input to be signed against (note that in the non-utxo cases it's
+//    not really possible to verify their consistency, because we don't commit to the actual
+//    destination in those cases).
+//    This is not a problem in general, but note that since we always use SigHashType::ALL in this
+//    app, each input signature is a signature over the entire tx. So e.g. if inputs 0 and 1 require
+//    keys A and B respectively, a malfunctioning host may request input 0 to be signed with key B
+//    and input 1 with key A; in such a case the signature 0 will be valid for input 1 and vice versa.
+//    This does not allow the host to change the reviewed transaction, but it means that the app must
+//    not promise the user that a particular input was signed by the key specified in `addresses`.
+#[derive(Encode, Decode)]
+pub struct TxInputData {
+    pub addresses: Vec<InputAddressPath>,
+    pub input: TxInputWithAdditionalInfo,
+}
+
+#[derive(Encode, Decode)]
+pub struct TxInputCommitmentData {
+    pub commitment: SighashInputCommitment,
+}
+
+// TODO:
+// 1) In order to be able to detect change outputs, there should be a way of specifying the destination
+//    via a derivation path.
+//    Note: the contents of Destination::PublicKeyHash and Destination::PublicKey should probably be
+//    enums of the form `enum PublicKeyHash { Own(derivation path), Foreign(actual hash) }`.
+// 2) Possible ways of handling change outputs (simplified version of what the cardano app seems to do):
+//  * a) require that all derivation paths (in inputs and in outputs) belong to the same account,
+//       fail if they don't;
+//    b) if an output is a simple Transfer to a change address in the account, omit it from review;
+//       if it's something more complicated, don't omit it from review, but mark is as change output.
+//  * Same as above, but only track (without failing) whether all inputs are signed with keys from the
+//    same account; if so and an output is a simple Transfer to a change address in that same account,
+//    omit the output from review. If the output references a change address but multiple accounts
+//    are referenced by inputs, or if the output is not a simple Transfer, then don't omit it,
+//    but mark it as change.
+// See https://github.com/mintlayer/mintlayer-ledger-app/issues/17.
+#[derive(Encode, Decode)]
+pub struct TxOutputData {
+    pub output: TxOutput,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Encode, Decode)]
+pub struct AdditionalOrderInfo {
+    pub initially_asked: OutputValue,
+    pub initially_given: OutputValue,
+    pub ask_balance: Amount,
+    pub give_balance: Amount,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Encode, Decode)]
+pub enum AdditionalUtxoInfo {
+    #[codec(index = 0)]
+    Utxo(TxOutput),
+
+    #[codec(index = 1)]
+    UtxoWithPoolData {
+        utxo: TxOutput,
+        staker_balance: Amount,
+    },
+}
+
+impl From<AdditionalUtxoInfo> for SighashInputCommitment {
+    fn from(value: AdditionalUtxoInfo) -> Self {
+        match value {
+            AdditionalUtxoInfo::Utxo(output) => SighashInputCommitment::Utxo(output),
+            AdditionalUtxoInfo::UtxoWithPoolData {
+                utxo,
+                staker_balance,
+            } => SighashInputCommitment::ProduceBlockFromStakeUtxo {
+                utxo,
+                staker_balance,
+            },
+        }
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Encode, Decode)]
+pub enum TxInputWithAdditionalInfo {
+    #[codec(index = 0)]
+    Utxo(UtxoOutPoint, AdditionalUtxoInfo),
+
+    #[codec(index = 1)]
+    Account(AccountOutPoint),
+
+    #[codec(index = 2)]
+    AccountCommand(AccountNonce, AccountCommand),
+
+    #[codec(index = 3)]
+    OrderAccountCommand(OrderAccountCommand, AdditionalOrderInfo),
+}
+
+impl TxInputWithAdditionalInfo {
+    pub fn into_input_and_commitment(self) -> (TxInput, SighashInputCommitment) {
+        match self {
+            TxInputWithAdditionalInfo::Utxo(utxo, info) => (TxInput::Utxo(utxo), info.into()),
+            TxInputWithAdditionalInfo::Account(acc) => {
+                (TxInput::Account(acc), SighashInputCommitment::None)
+            }
+            TxInputWithAdditionalInfo::AccountCommand(nonce, cmd) => (
+                TxInput::AccountCommand(nonce, cmd),
+                SighashInputCommitment::None,
+            ),
+            TxInputWithAdditionalInfo::OrderAccountCommand(cmd, info) => {
+                let commitment = match &cmd {
+                    OrderAccountCommand::FillOrder(_, _) => {
+                        SighashInputCommitment::FillOrderAccountCommand {
+                            initially_asked: info.initially_asked,
+                            initially_given: info.initially_given,
+                        }
+                    }
+                    OrderAccountCommand::ConcludeOrder(_) => {
+                        SighashInputCommitment::ConcludeOrderAccountCommand {
+                            initially_asked: info.initially_asked,
+                            initially_given: info.initially_given,
+                            ask_balance: info.ask_balance,
+                            give_balance: info.give_balance,
+                        }
+                    }
+                    OrderAccountCommand::FreezeOrder(_) => SighashInputCommitment::None,
+                };
+                (TxInput::OrderAccountCommand(cmd), commitment)
+            }
+        }
+    }
+}
+
+#[derive(Encode, Decode, Clone, Copy, Debug, Eq, PartialEq, IntoPrimitive)]
+#[repr(u8)]
+pub enum CoinType {
+    Mainnet = 0,
+    Testnet = 1,
+    Regtest = 2,
+    Signet = 3,
+}
+
+impl From<CoinType> for mlcp::CoinType {
+    fn from(value: CoinType) -> Self {
+        match value {
+            CoinType::Mainnet => Self::Mainnet,
+            CoinType::Testnet => Self::Testnet,
+            CoinType::Regtest => Self::Regtest,
+            CoinType::Signet => Self::Signet,
+        }
+    }
+}
+
+#[repr(u8)]
+#[derive(Encode, Decode, Clone, Copy, IntoPrimitive)]
+pub enum AddrType {
+    PublicKey = 0,
+    PublicKeyHash = 1,
+}
+
+/// BIP32 path stored as an array of [`u32`].
+#[derive(Default, Encode, Decode, Clone)]
+pub struct Bip32Path(pub Vec<u32>);
+
+impl AsRef<[u32]> for Bip32Path {
+    fn as_ref(&self) -> &[u32] {
+        &self.0
+    }
+}
+
+/// Address path to be signed for an input
+#[derive(Encode, Decode)]
+pub struct InputAddressPath {
+    pub path: Bip32Path,
+    pub multisig_idx: Option<u32>,
+}
+
+#[derive(Encode, Decode)]
+pub struct UncompressedSecp256k1PublicKey(pub [u8; 65]);
+
+#[derive(Encode, Decode)]
+pub struct ChainCode(pub [u8; 32]);
+
+#[derive(Encode, Decode)]
+pub struct PublicKeyResponse {
+    pub public_key: UncompressedSecp256k1PublicKey,
+    pub chain_code: ChainCode,
+}
+
+#[derive(Encode, Decode)]
+pub struct Signature(pub [u8; 64]);
+
+#[derive(Encode, Decode)]
+pub struct TxInputSignatureResponse {
+    pub signature: Signature,
+    pub input_idx: u32,
+    pub multisig_idx: Option<u32>,
+    pub has_next: bool,
+}
+
+#[derive(Encode, Decode)]
+pub struct MsgSignatureResponse {
+    pub signature: Signature,
+}
+
+#[derive(Encode, Decode)]
+pub enum Response {
+    #[codec(index = 0)]
+    ExpectingNextChunk,
+    #[codec(index = 1)]
+    PublicKey(PublicKeyResponse),
+    #[codec(index = 2)]
+    TxSetup,
+    #[codec(index = 3)]
+    TxNext,
+    #[codec(index = 4)]
+    TxInputSignature(TxInputSignatureResponse),
+    #[codec(index = 5)]
+    MessageSetup,
+    #[codec(index = 6)]
+    MessageSignature(MsgSignatureResponse),
+    #[codec(index = 7)]
+    Pong,
+}
+
+pub fn encode<T: Encode>(t: T) -> Vec<u8> {
+    t.encode()
+}
+
+pub fn encode_to<T, O>(t: T, output: &mut O)
+where
+    T: Encode,
+    O: parity_scale_codec::Output,
+{
+    t.encode_to(output)
+}
+
+pub fn encode_as_compact<N>(num: N) -> Vec<u8>
+where
+    // Note: without the Num bound, if N is a reference, the compilation would fail with
+    // "overflow evaluating the requirement `for<'b> CompactRef<'b, _>: Encode`".
+    // With the bound, the error is much clearer.
+    N: num_traits::Num,
+    N: parity_scale_codec::HasCompact,
+    <N as parity_scale_codec::HasCompact>::Type: Encode,
+{
+    <N as parity_scale_codec::HasCompact>::Type::from(num).encode()
+}
+
+pub fn encode_as_compact_to<N, O>(num: N, output: &mut O)
+where
+    // Same note as in encode_as_compact.
+    N: num_traits::Num,
+    N: parity_scale_codec::HasCompact,
+    <N as parity_scale_codec::HasCompact>::Type: Encode,
+    O: parity_scale_codec::Output,
+{
+    <N as parity_scale_codec::HasCompact>::Type::from(num).encode_to(output)
+}
+
+pub fn decode_all<T: Decode>(mut bytes: &[u8]) -> Option<T> {
+    T::decode_all(&mut bytes).ok()
+}
+
+/// This represents an APDU used in communication with Mintlayer Ledger app.
+///
+/// Note that the class byte is not present here, because it's the same for all our APDUs.
+///
+/// Also, we don't have the second parameter byte here either, because its meaning is the same
+/// across all APDUs - it specifies whether this APDU represents the last chunk of the instruction.
+pub struct Apdu<'a> {
+    instruction_byte: u8,
+    param1_byte: u8,
+    command_data: &'a [u8],
+    is_last_chunk: bool,
+}
+
+impl<'a> Apdu<'a> {
+    /// Create an APDU with data; this will fail if the data length exceeds the allowed maximum.
+    pub fn new_with_data(
+        instruction_byte: u8,
+        param1_byte: u8,
+        command_data: &'a [u8],
+    ) -> Option<Self> {
+        (command_data.len() <= MAX_APDU_DATA_LEN).then_some(Self {
+            instruction_byte,
+            param1_byte,
+            command_data,
+            is_last_chunk: true,
+        })
+    }
+
+    /// Returns an ExactSizeIterator of APDUs by chunking the data to MAX_APDU_DATA_LEN.
+    pub fn new_chunks(
+        instruction_byte: u8,
+        param1_byte: u8,
+        data: &'a [u8],
+    ) -> impl ExactSizeIterator<Item = Self> {
+        // Note: the standard `chunks` method returns zero-length iterator if the data has zero
+        // length, but we need to return 1 APDU with zero-length data in such a case.
+        let chunk_count = data.len().div_ceil(MAX_APDU_DATA_LEN).max(1);
+        let chunk_iter = (0..chunk_count).map(|i| {
+            let start = i * MAX_APDU_DATA_LEN;
+            let end = (start + MAX_APDU_DATA_LEN).min(data.len());
+            &data[start..end]
+        });
+
+        chunk_iter.enumerate().map(move |(chunk_idx, chunk)| Self {
+            instruction_byte,
+            param1_byte,
+            command_data: chunk,
+            is_last_chunk: chunk_idx == chunk_count - 1,
+        })
+    }
+
+    pub fn is_last(&self) -> bool {
+        self.is_last_chunk
+    }
+
+    /// The number of bytes that will be written by `write_bytes`.
+    ///
+    /// This can be used to reserve the required capacity in the destination collection
+    /// (note that `Extend::extend_reserve is` still nightly-only, so we can't use it).
+    pub fn bytes_count(&self) -> usize {
+        // class, instruction, param1 and param2 bytes, then 1 byte for data length, then the
+        // data itself.
+        5 + self.command_data.len()
+    }
+
+    pub fn write_bytes(&self, collection: &mut impl core::iter::Extend<u8>) {
+        let param2_byte = if self.is_last_chunk { P2_DONE } else { P2_MORE };
+
+        collection.extend([
+            APDU_CLASS,
+            self.instruction_byte,
+            self.param1_byte,
+            param2_byte,
+        ]);
+        // Should be true by construction
+        assert!(self.command_data.len() <= u8::MAX as usize);
+        collection.extend(core::iter::once(self.command_data.len() as u8));
+        collection.extend(self.command_data.iter().copied());
+    }
+}
+
+/// Application status words.
+#[repr(u16)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Display, IntoPrimitive, TryFromPrimitive)]
+pub enum StatusWord {
+    // Standard Ledger APDU Codes
+    #[display("Success")]
+    Ok = 0x9000,
+    #[display("Nothing received")]
+    NothingReceived = 0x6982,
+    #[display("User cancelled")]
+    Deny = 0x6985,
+    #[display("CLA not supported")]
+    ClaNotSupported = 0x6E00,
+    #[display("Instruction not supported")]
+    InsNotSupported = 0x6E01,
+    #[display("Wrong P1/P2 parameters")]
+    WrongP1P2 = 0x6E02,
+    #[display("Wrong APDU length")]
+    WrongApduLength = 0x6E03,
+    #[display("Unknown")]
+    Unknown = 0x6D00,
+    #[display("Panic")]
+    Panic = 0xE000,
+    #[display("Device locked")]
+    DeviceLocked = 0x5515,
+
+    // App Specific Errors (0xB...)
+    #[display("Transaction display failed")]
+    TxDisplayFail = 0xB000,
+    #[display("Transaction lock time value is invalid")]
+    TxLockTimeInvalid = 0xB001,
+    #[display("Transaction wrong length")]
+    TxWrongLength = 0xB002,
+    #[display("Hashing failed")]
+    HashFail = 0xB003,
+    #[display("Address encoding failed")]
+    AddressEncodingFail = 0xB004,
+    #[display("Different instruction than expected")]
+    WrongInstruction = 0xB005,
+    #[display("Key derivation failed")]
+    KeyDeriveFail = 0xB006,
+    #[display("Orders V0 not supported")]
+    OrdersV0NotSupported = 0xB007,
+    #[display("Wrong context")]
+    WrongContext = 0xB008,
+    #[display("Deserialization failed")]
+    DeserializeFail = 0xB009,
+    #[display("Invalid input UTXO")]
+    TxInvalidInputUtxo = 0xB00A,
+    #[display("Numeric operation failed")]
+    TxNumericOperationFail = 0xB00B,
+    #[display("Tx fee underflow")]
+    TxFeeUnderflow = 0xB00C,
+    #[display("Invalid data")]
+    InvalidData = 0xB00D,
+    #[display("Nothing to sign")]
+    NothingToSign = 0xB00E,
+    #[display("Transaction already finished")]
+    TxAlreadyFinished = 0xB00F,
+    #[display("Invalid path")]
+    InvalidPath = 0xB010,
+    #[display("Invalid uncompressed public key")]
+    InvalidUncompressedPublicKey = 0xB011,
+    #[display("Max buffer length exceeded")]
+    MaxBufferLenExceeded = 0xB012,
+    #[display("Different input commitment hash")]
+    DifferentInputCommitmentHash = 0xB013,
+    #[display("Invalid timestamp")]
+    InvalidTimestamp = 0xB014,
+    #[display("Signature for FillOrder input requested")]
+    FillOrderSigRequested = 0xB015,
+    #[display("Transaction has zero inputs")]
+    TxWithZeroInputs = 0xB016,
+
+    // Ecc Errors
+    #[display("ECC Carry")]
+    EccCarry = 0xB100,
+    #[display("ECC Locked")]
+    EccLocked = 0xB101,
+    #[display("ECC Unlocked")]
+    EccUnlocked = 0xB102,
+    #[display("ECC Not Locked")]
+    EccNotLocked = 0xB103,
+    #[display("ECC Not Unlocked")]
+    EccNotUnlocked = 0xB104,
+    #[display("ECC Internal Error")]
+    EccInternalError = 0xB105,
+    #[display("ECC Invalid Parameter Size")]
+    EccInvalidParameterSize = 0xB106,
+    #[display("ECC Invalid Parameter Value")]
+    EccInvalidParameterValue = 0xB107,
+    #[display("ECC Invalid Parameter")]
+    EccInvalidParameter = 0xB108,
+    #[display("ECC Not Invertible")]
+    EccNotInvertible = 0xB109,
+    #[display("ECC Overflow")]
+    EccOverflow = 0xB10A,
+    #[display("ECC Memory Full")]
+    EccMemoryFull = 0xB10B,
+    #[display("ECC No Residue")]
+    EccNoResidue = 0xB10C,
+    #[display("ECC Point At Infinity")]
+    EccPointAtInfinity = 0xB10D,
+    #[display("ECC Invalid Point")]
+    EccInvalidPoint = 0xB10E,
+    #[display("ECC Invalid Curve")]
+    EccInvalidCurve = 0xB10F,
+    #[display("ECC Generic Error")]
+    EccGenericError = 0xB110,
+}
diff --git a/crates/messages/src/tests.rs b/crates/messages/src/tests.rs
new file mode 100644
index 0000000..aba727f
--- /dev/null
+++ b/crates/messages/src/tests.rs
@@ -0,0 +1,74 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+use alloc::vec::Vec;
+
+use test_utils::prelude::*;
+
+use super::*;
+
+#[test_item]
+fn test_apdu_chunking() {
+    let byte_iter = || core::iter::repeat(0..=9).flatten();
+
+    let ins = 0xaa;
+    let p1 = 0xbb;
+
+    // One chunk
+    {
+        let data = byte_iter().take(100).collect::<Vec<_>>();
+        let chunks = Apdu::new_chunks(ins, p1, &data).collect::<Vec<_>>();
+        assert_eq!(chunks.len(), 1);
+        assert_eq!(chunks[0].instruction_byte, ins);
+        assert_eq!(chunks[0].param1_byte, p1);
+        assert_eq!(chunks[0].command_data, &data);
+        assert!(chunks[0].is_last_chunk);
+    }
+
+    // One chunk, data is zero length
+    {
+        let chunks = Apdu::new_chunks(ins, p1, &[]).collect::<Vec<_>>();
+        assert_eq!(chunks.len(), 1);
+        assert_eq!(chunks[0].instruction_byte, ins);
+        assert_eq!(chunks[0].param1_byte, p1);
+        assert_eq!(chunks[0].command_data, &[]);
+        assert!(chunks[0].is_last_chunk);
+    }
+
+    // Multiple chunks
+    {
+        let data = byte_iter().take(600).collect::<Vec<_>>();
+        let chunks = Apdu::new_chunks(ins, p1, &data).collect::<Vec<_>>();
+
+        assert_eq!(chunks.len(), 3);
+
+        assert_eq!(chunks[0].instruction_byte, ins);
+        assert_eq!(chunks[0].param1_byte, p1);
+        assert_eq!(chunks[0].command_data, &data[0..255]);
+        assert!(!chunks[0].is_last_chunk);
+
+        assert_eq!(chunks[1].instruction_byte, ins);
+        assert_eq!(chunks[1].param1_byte, p1);
+        assert_eq!(chunks[1].command_data, &data[255..510]);
+        assert!(!chunks[1].is_last_chunk);
+
+        assert_eq!(chunks[2].instruction_byte, ins);
+        assert_eq!(chunks[2].param1_byte, p1);
+        assert_eq!(chunks[2].command_data, &data[510..]);
+        assert!(chunks[2].is_last_chunk);
+    }
+}
diff --git a/crates/test-utils/Cargo.toml b/crates/test-utils/Cargo.toml
new file mode 100644
index 0000000..db8b193
--- /dev/null
+++ b/crates/test-utils/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "test-utils"
+version.workspace = true
+edition = "2024"
+
+[dependencies]
+ledger_device_sdk = { workspace = true, features = ["unit_test"] }
+testmacro.workspace = true
+
+[lib]
+# Note: this crate doesn't have unit tests at the moment. If we ever need them, a custom runner
+# has to be set up the same way it's done in `mintlayer-app-core`. For now we just disable tests
+# completely to prevent Cargo from producing an uncompilable test binary.
+test = false
diff --git a/crates/test-utils/src/lib.rs b/crates/test-utils/src/lib.rs
new file mode 100644
index 0000000..2e33220
--- /dev/null
+++ b/crates/test-utils/src/lib.rs
@@ -0,0 +1,93 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+//! Every crate that needs unit tests that can be run on Speculos must have the following:
+//! 1. It must be a lib crate.
+//! 2. At the top of its `lib.rs` specify this:
+//!    1. Disable the generation of `fn main`.
+//!
+//!       #![cfg_attr(test, no_main)]
+//!
+//!    2. "custom_test_frameworks" must be enabled to be able to specify the custom runner and use
+//!       the `#[test_case]` attribute (used internally by `testmacro::test_item`).
+//!
+//!       #![feature(custom_test_frameworks)]
+//!
+//!    3. Specify the custom test runner. All test cases collected by `#[test_case]` will be passed
+//!       to this function. In particular, `sdk_test_runner` will loop over the array of test cases
+//!       and:
+//!       a) fix references stored inside the test case via pic_rs/pic;
+//!       b) invoke the closure associated with the test case.
+//!
+//!       #![test_runner(ledger_device_sdk::testing::sdk_test_runner)]
+//!
+//!
+//!    4. The following will put `fn test_main` at the test crate's root, which will call the runner
+//!       that we've specified above. The crate's `sample_main` will have to call `test_main`.
+//!
+//!       #![reexport_test_harness_main = "test_main"]
+//! 3. Under `#[cfg(test)]` call:
+//!    1. test_utils::impl_panic_handler!();
+//!    2. test_utils::impl_main!();
+
+#![no_std]
+
+extern crate alloc;
+
+use alloc::{borrow::ToOwned as _, format};
+
+pub mod prelude {
+    // testmacro::test_item expects `TestType` to be imported.
+    pub use ledger_device_sdk::testing::TestType;
+
+    pub use testmacro::test_item;
+}
+
+#[macro_export]
+macro_rules! impl_panic_handler {
+    () => {
+        #[panic_handler]
+        fn panic_handler(info: &core::panic::PanicInfo) -> ! {
+            test_utils::handle_panic(info)
+        }
+    };
+}
+
+#[allow(clippy::crate_in_macro_def)]
+#[macro_export]
+macro_rules! impl_main {
+    () => {
+        #[unsafe(no_mangle)]
+        extern "C" fn sample_main() {
+            crate::test_main();
+            ledger_device_sdk::exit_app(0);
+        }
+    };
+}
+
+pub fn handle_panic(info: &core::panic::PanicInfo) -> ! {
+    ledger_device_sdk::error!(
+        "Panic occurred at {}: {}",
+        info.location().map_or_else(
+            || "???".to_owned(),
+            |loc| format!("{}:{}", loc.file(), loc.line())
+        ),
+        info.message(),
+    );
+
+    ledger_device_sdk::exit_app(1);
+}
diff --git a/docs/memory_usage.md b/docs/memory_usage.md
new file mode 100644
index 0000000..71a8fba
--- /dev/null
+++ b/docs/memory_usage.md
@@ -0,0 +1,94 @@
+# Memory usage
+
+## Device memory size
+
+Judging by `.ld` files in [the Ledger Rust SDK](https://github.com/LedgerHQ/ledger-device-rust-sdk/tree/cad196841dbd72c037cfa01bec81a4a3ae57a04e/ledger_secure_sdk_sys/devices),
+the amount of SRAM each model has is:
+| Device            | SRAM |
+| ----------------- | ---- |
+| apex_p, nanosplus | 40KB |
+| flex, stax        | 36KB |
+| nanox             | 28KB |
+
+The first part of the RAM will be occupied by the app's globals (one of which will be the heap used by the Rust code) and the rest is stack.
+
+The `HEAP_SIZE` variable in `.cargo/config.toml` specifies the size of the Rust heap (which is just [a static array under the hood](https://github.com/LedgerHQ/ledger-device-rust-sdk/blob/cad196841dbd72c037cfa01bec81a4a3ae57a04e/ledger_secure_sdk_sys/src/lib.rs#L64)).
+
+I.e. the bigger `HEAP_SIZE` is, the less is the stack. And with the `HEAP_SIZE` of 16KB, we'll have less than 12KB of stack at nanox.
+
+## Reducing app stack usage
+
+- Function's parameters and the return value consume stack space (unless the object is small enough to be put into a register).
+- Moving an object around inside the function body may increase stack consumption as well.
+
+So,
+- Box large types if you need to pass/return them by value.
+- Avoid unboxing boxed large objects when passing them by value. E.g. even if a function only needs `LargeObj`,
+  pass `Box<LargeObj>` to it anyway (which would be discouraged by the "normal" best practices), because passing it
+  unboxed would increase the stack usage.\
+  This includes the case when a member function consumes `self` - declare it as `self: Box<Self>` instead.
+- `sizeof` of 200 bytes is probably large enough. E.g. in the past boxing certain objects of roughly this size
+  decreased stack usage by roughly 1.3KB (which is more than 10% of all stack space available on nanox).
+
+### Determining the current stack usage of the app
+
+Build the app with `emit-stack-sizes`:
+```
+RUSTFLAGS="-Z emit-stack-sizes" cargo ledger build nanox
+```
+After that you can use `llvm-readobj` to obtain sizes of stack frames of each function:
+```
+llvm-readobj --stack-sizes --demangle target/nanox/release/mintlayer-app
+```
+
+You can also force `llvm-readobj` to emit json and use `jq` to sort the output by the stack size. E.g. the following
+will print 20 functions with the biggest stack frame size:
+```
+llvm-readobj --stack-sizes --demangle --elf-output-style=JSON target/nanox/release/mintlayer-app | jq -r '.[].StackSizes | sort_by(.Entry.Size) | reverse | .[:20][] | .Entry | "\(.Size)\t\(.Functions | join(", "))"'
+```
+
+### Determining the actual available stack
+
+At least in the current version of the SDK, the linker script emits symbols that
+can be used to determine the actual stack size, e.g. via `llvm-readelf`:
+```
+llvm-readelf -s target/nanox/release/mintlayer-app | rg '_stack|_estack'
+```
+Example output:
+```
+1581: da7a425c     0 NOTYPE  GLOBAL DEFAULT     6 app_stack_canary
+1624: da7a7000     0 NOTYPE  GLOBAL DEFAULT     6 _estack
+1697: da7a4260     0 NOTYPE  GLOBAL DEFAULT     6 _stack
+```
+Here `_estack` is the end of the stack area, `_stack` is the beginning of it and `app_stack_canary` is a 4-byte marker
+placed just below `_stack` and used to detect stack overflows. The difference between `_estack` and `_stack` will be
+the stack size, in this case it's da7a7000-da7a4260=2DA0 (11680 in decimal).
+
+### Other notes
+
+This code:
+```
+fn foo(x: &X) {
+    match x {
+        X::A => { /*do stuff*/ },
+        X::B => { /*do other stuff*/ },
+    }
+}
+```
+may use more stack than:
+```
+fn foo(x: &X) {
+    match x {
+        X::A => stuff(),
+        X::B => other_stuff(),
+    }
+}
+
+#[inline(never)] fn stuff()       { /*do stuff*/ }
+#[inline(never)] fn other_stuff() { /*do other stuff*/ }
+```
+I.e. it seems that LLVM cannot always reuse stack slots between different branches of the `match`, and with bigger enums
+and bigger stack usage in each branch the overhead becomes bigger as well. So, splitting a large `match` into separate
+non-inlinable functions may be a way of reducing the app's stack usage, but this should probably be the last resort,
+because if all large objects are boxed, the stack usage in each branch should be relatively small, which will make
+the overhead relatively small as well.
diff --git a/docs/technical_specification.md b/docs/technical_specification.md
new file mode 100644
index 0000000..7535768
--- /dev/null
+++ b/docs/technical_specification.md
@@ -0,0 +1,279 @@
+# Mintlayer application: Technical Specifications
+
+This page details the protocol implemented for the Mintlayer Ledger app.
+
+## Framework
+
+### APDUs
+
+The messaging format of the app is compatible with the standard [APDU protocol](https://developers.ledger.com/docs/device-app/explanation/io#apdu-interpretation-loop).
+
+The class byte used for all standard commands is `CLA = 0xE1`.
+
+| CLA | INS | COMMAND NAME   | DESCRIPTION                                                        |
+| --- | --- | -------------- | ------------------------------------------------------------------ |
+| E1  | 00  | GET_PUBLIC_KEY | Return (and optionally show on screen) a public key and chain code |
+| E1  | 01  | SIGN_TX        | Sign a transaction through a multi-step process                    |
+| E1  | 02  | SIGN_MSG       | Sign a generic message                                             |
+| E1  | 03  | PING           | Simple ping request to check connectivity                          |
+
+### Chunking and P2
+
+The APDU buffer on the Ledger device has a maximum data length (`MAX_APDU_DATA_LEN` = 255 bytes). To accommodate larger payloads, the app implements a chunking mechanism controlled by the `P2` parameter:
+
+- `P2 = 0x00` (`P2_DONE`): This is the final chunk (or the only chunk) of the instruction. The app will assemble the buffer and execute the command.
+- `P2 = 0x80` (`P2_MORE`): More chunks follow. The app accumulates the data into a buffer (up to a maximum of `4080` bytes) and returns SCALE-encoded `Response::ExpectingNextChunk` to ask the client for the next chunk.
+
+_Note: For chunked commands, `INS` and `P1` must remain identical across all chunks of the same sequence._
+
+### Data Serialization and Responses
+
+The app uses **SCALE codec** (`parity_scale_codec`) for the serialization and deserialization of the data payloads. Vector length prefixes and standard variable-length integer types are represented using SCALE's Compact encoding.
+
+#### Response Wrapper
+
+On a successful command execution (returning status word `0x9000`), the app encodes the returned payload inside a top-level SCALE-encoded `Response` enum.
+
+The SCALE representation of an enum begins with a single byte representing the variant index, followed by the encoded fields of that variant.
+
+The `Response` enum structure and its variant indices are:
+
+| Index | Name                 | Inner Payload Type           | Description                                                            |
+|-------|----------------------|------------------------------|------------------------------------------------------------------------|
+| `0`   | `ExpectingNextChunk` | None                         | Returned when more APDU chunks are expected (`P2_MORE` sequence)       |
+| `1`   | `PublicKey`          | `PublicKeyResponse`          | Public key and chain code response                                     |
+| `2`   | `TxSetup`            | None                         | Acknowledges transaction initialization (`SIGN_TX` with `P1 = 0`)      |
+| `3`   | `TxNext`             | None                         | Acknowledges receipt of a transaction chunk                            |
+| `4`   | `TxInputSignature`   | `TxInputSignatureResponse`   | Contains an input signature                                            |
+| `5`   | `MessageSetup`       | None                         | Acknowledges message signing initialization (`SIGN_MSG` with `P1 = 0`) |
+| `6`   | `MessageSignature`   | `MsgSignatureResponse`       | Contains the final message signature                                   |
+| `7`   | `Pong`               | None                         | Pong response for the `PING` instruction                               |
+
+Any successful command output described below is prefixed by its corresponding 1-byte variant index.
+
+## Status Words
+
+The application returns standard Ledger status words as well as app-specific and ECC cryptographic errors.
+
+| SW     | SW name                        | Description                                    |
+| ------ | ------------------------------ | ---------------------------------------------- |
+| 0x5515 | `DeviceLocked`                 | Device locked                                  |
+| 0x6982 | `NothingReceived`              | Nothing received                               |
+| 0x6985 | `Deny`                         | Rejected by user / User cancelled              |
+| 0x6D00 | `Unknown`                      | Unknown                                        |
+| 0x6E00 | `ClaNotSupported`              | CLA not supported                              |
+| 0x6E01 | `InsNotSupported`              | Instruction not supported                      |
+| 0x6E02 | `WrongP1P2`                    | Wrong P1/P2 parameters                         |
+| 0x6E03 | `WrongApduLength`              | Wrong APDU length                              |
+| 0x9000 | `Ok`                           | Success                                        |
+| 0xB000 | `TxDisplayFail`                | Transaction display failed                     |
+| 0xB001 | `TxLockTimeInvalid`            | Transaction lock time value is invalid         |
+| 0xB002 | `TxWrongLength`                | Transaction wrong length                       |
+| 0xB003 | `HashFail`                     | Hashing failed                                 |
+| 0xB004 | `AddressEncodingFail`          | Address encoding failed                        |
+| 0xB005 | `WrongInstruction`             | Different instruction than expected            |
+| 0xB006 | `KeyDeriveFail`                | Key derivation failed                          |
+| 0xB007 | `OrdersV0NotSupported`         | Orders V0 not supported                        |
+| 0xB008 | `WrongContext`                 | Wrong context (e.g., Next called before Start) |
+| 0xB009 | `DeserializeFail`              | SCALE deserialization failed                   |
+| 0xB00A | `TxInvalidInputUtxo`           | Invalid input UTXO                             |
+| 0xB00B | `TxNumericOperationFail`       | Numeric operation failed                       |
+| 0xB00C | `TxFeeUnderflow`               | Tx fee underflow                               |
+| 0xB00D | `InvalidData`                  | Invalid data                                   |
+| 0xB00E | `NothingToSign`                | Nothing to sign                                |
+| 0xB00F | `TxAlreadyFinished`            | Transaction already finished                   |
+| 0xB010 | `InvalidPath`                  | Invalid BIP32 path                             |
+| 0xB011 | `InvalidUncompressedPublicKey` | Invalid uncompressed public key                |
+| 0xB012 | `MaxBufferLenExceeded`         | Max buffer length exceeded (Chunking limit)    |
+| 0xB013 | `DifferentInputCommitmentHash` | Different input commitment hash                |
+| 0xB014 | `InvalidTimestamp`             | Invalid timestamp                              |
+| 0xB015 | `FillOrderSigRequested`        | Signature for FillOrder input requested        |
+| 0xB016 | `TxWithZeroInputs`             | Transaction has zero inputs                    |
+| 0xB100 | `EccCarry`                     | ECC Carry                                      |
+| 0xB101 | `EccLocked`                    | ECC Locked                                     |
+| 0xB102 | `EccUnlocked`                  | ECC Unlocked                                   |
+| 0xB103 | `EccNotLocked`                 | ECC Not Locked                                 |
+| 0xB104 | `EccNotUnlocked`               | ECC Not Unlocked                               |
+| 0xB105 | `EccInternalError`             | ECC Internal Error                             |
+| 0xB106 | `EccInvalidParameterSize`      | ECC Invalid Parameter Size                     |
+| 0xB107 | `EccInvalidParameterValue`     | ECC Invalid Parameter Value                    |
+| 0xB108 | `EccInvalidParameter`          | ECC Invalid Parameter                          |
+| 0xB109 | `EccNotInvertible`             | ECC Not Invertible                             |
+| 0xB10A | `EccOverflow`                  | ECC Overflow                                   |
+| 0xB10B | `EccMemoryFull`                | ECC Memory Full                                |
+| 0xB10C | `EccNoResidue`                 | ECC No Residue                                 |
+| 0xB10D | `EccPointAtInfinity`           | ECC Point At Infinity                          |
+| 0xB10E | `EccInvalidPoint`              | ECC Invalid Point                              |
+| 0xB10F | `EccInvalidCurve`              | ECC Invalid Curve                              |
+| 0xB110 | `EccGenericError`              | ECC Generic Error                              |
+| 0xE000 | `Panic`                        | Panic                                          |
+
+---
+
+## Commands
+
+### GET_PUBLIC_KEY
+
+Returns a public key and chain code at the given derivation path.
+Optionally displays the generated address on the device screen for user verification.
+
+#### Encoding
+
+**Command**
+
+| _CLA_ | _INS_ | _P1_                 |
+| ----- | ----- | -------------------- |
+| E1    | 00    | `0` or `1` (Display) |
+
+**Input data (`GetPubKeyReq` - SCALE encoded)**
+
+| Type        | Name        | Description                                               |
+| ----------- | ----------- | --------------------------------------------------------- |
+| `u8` (Enum) | `coin_type` | `0` = Mainnet, `1` = Testnet, `2` = Regtest, `3` = Signet |
+| `Vec<u32>`  | `path`      | The BIP32 derivation path                                 |
+
+**Output data (`Response::PublicKey(PublicKeyResponse)` - SCALE encoded)**
+
+| Length | Description                                                         |
+| ------ | ------------------------------------------------------------------- |
+| `1`    | Variant index byte (`0x01`)                                         |
+| `65`   | The uncompressed public key (`PublicKeyResponse.public_key`)        |
+| `32`   | The chain code (`PublicKeyResponse.chain_code`)                     |
+
+#### Description
+
+If `P1` is `0`, the application derives the public key and returns it silently.
+If `P1` is `1`, the application will display the address derived from the requested path on the device screen.
+The command will only return `Ok` (0x9000) if the user approves it, otherwise, it returns `Deny` (0x6985).
+
+---
+
+### SIGN_TX
+
+Signs a Mintlayer transaction.
+Because transactions can be larger than available APDU buffers and RAM, the parsing and signing process is split into an interactive state machine using `P1 = 0` (Start) and `P1 = 1` (Next).
+
+#### Encoding
+
+**Command**
+
+| _CLA_ | _INS_ | _P1_                      |
+| ----- | ----- | ------------------------- |
+| E1    | 01    | `0` (Start) or `1` (Next) |
+
+**Input Data for `P1 = 0` (Start) (`SignTxStartReq` - SCALE encoded)**
+
+| Type  | Name          | Description                                               |
+| ----- | ------------- | --------------------------------------------------------- |
+| `u8`  | `coin`        | `0` = Mainnet, `1` = Testnet, `2` = Regtest, `3` = Signet |
+| `u8`  | `version`     | Transaction version (0 = V1)                            |
+| `u32` | `num_inputs`  | Total number of inputs in the transaction                 |
+| `u32` | `num_outputs` | Total number of outputs in the transaction                |
+
+**Input Data for `P1 = 1` (Next) (`SignTxNextReq` Enum - SCALE encoded)**
+
+The client sends a sequence of `SignTxNextReq` variants. The variant index dictates the type of data being sent:
+
+- `ProcessInput` (Index 0): Contains `TxInputData` (input address paths and UTXO/Account info).
+- `ProcessInputCommitment` (Index 1): Contains `TxInputCommitmentData`.
+- `ProcessOutput` (Index 2): Contains `TxOutputData`.
+- `ReturnNextSignature` (Index 3): Requests the device to yield the next available signature.
+
+**Output data (`Response::TxInputSignature(TxInputSignatureResponse)` - SCALE encoded)**
+
+Yielded during `ReturnNextSignature` sequences.
+
+The response payload is prefixed with the `TxInputSignature` variant index (`0x04`), followed by the `TxInputSignatureResponse` fields:
+
+| Type          | Name           | Description                                 |
+| ------------- | -------------- | ------------------------------------------- |
+| `[u8; 64]`    | `signature`    | The 64-byte cryptographic signature         |
+| `u32`         | `input_idx`    | The index of the input that was just signed |
+| `Option<u32>` | `multisig_idx` | Optional multisig index                     |
+| `bool`        | `has_next`     | True if there are more signatures remaining |
+
+*Note: For `Start` (`P1 = 0`) and intermediate `Next` (`P1 = 1`) data chunks (before signatures), the app returns `Response::TxSetup` (variant index `0x02`) and `Response::TxNext` (variant index `0x03`) respectively, with no extra fields.*
+
+#### Description
+
+To sign a transaction, the client must follow a strict order:
+
+1. Call `SIGN_TX` with `P1 = 0` (Start) passing `SignTxStartReq`.
+2. Sequentially call `SIGN_TX` with `P1 = 1` (Next) to stream inputs (`ProcessInput`), input commitments (`ProcessInputCommitment`) and then outputs (`ProcessOutput`).
+3. After all data is verified by the user on the device's secure screen, the client requests signatures by repeatedly calling `SIGN_TX` with `P1 = 1` and the `ReturnNextSignature` variant.
+4. The device will yield `TxInputSignatureResponse` payloads until `has_next` is false.
+
+---
+
+### SIGN_MSG
+
+Signs a generic message using a BIP-32 derived key.
+
+#### Encoding
+
+**Command**
+
+| _CLA_ | _INS_ | _P1_                      |
+| ----- | ----- | ------------------------- |
+| E1    | 02    | `0` (Start) or `1` (Next) |
+
+**Input Data for `P1 = 0` (Start) (`SignMessageStartReq` - SCALE encoded)**
+
+| Type        | Name        | Description                                   |
+| ----------- | ----------- | --------------------------------------------- |
+| `u8` (Enum) | `coin`      | Coin type (Mainnet, Testnet, Regtest, Signet) |
+| `u8` (Enum) | `addr_type` | `0` = PublicKey, `1` = PublicKeyHash          |
+| `Vec<u32>`  | `path`      | The BIP32 derivation path to use for signing  |
+
+**Input Data for `P1 = 1` (Next)**
+
+| Type         | Description                                                   |
+| ------------ | ------------------------------------------------------------- |
+| `<variable>` | The raw byte chunks of the message payload to be accumulated. |
+
+**Output data (`Response::MessageSignature(MsgSignatureResponse)` - SCALE encoded)**
+
+The response payload is prefixed with the `MessageSignature` variant index (`0x06`), followed by the `MsgSignatureResponse` fields:
+
+| Length | Description                         |
+| ------ | ----------------------------------- |
+| `64`   | The 64-byte cryptographic signature |
+
+*Note: For `Start` (`P1 = 0`) initialization, the app returns `Response::MessageSetup` (variant index `0x05`) with no extra fields.*
+
+#### Description
+
+The `SIGN_MSG` flow initializes the signing context via `Start`.
+The client then sends the message chunks iteratively using `Next`.
+Once the message transmission is completed and the user validates the request on the hardware screen,
+the device returns the 64-byte signature.
+Chunking the payload via the `P2` parameter mechanism is utilized here if the data exceeds a single APDU packet limit.
+
+---
+
+### PING
+
+Simple ping request to check connectivity.
+
+#### Encoding
+
+**Command**
+
+| _CLA_ | _INS_ | _P1_ |
+| ----- | ----- | ---- |
+| E1    | 03    | `0`  |
+
+**Input data**
+
+None.
+
+**Output data (`Response::Pong` - SCALE encoded)**
+
+| Length | Description                                                 |
+| ------ | ----------------------------------------------------------- |
+| `1`    | Variant index byte (`0x07`) representing `Response::Pong` |
+
+#### Description
+
+The client sends a `PING` command to verify that the app is running and responsive.
+The app returns `Response::Pong` (success indicator) on success, and returns the home screen to the user.
diff --git a/ledger_app.toml b/ledger_app.toml
new file mode 100644
index 0000000..853c6c5
--- /dev/null
+++ b/ledger_app.toml
@@ -0,0 +1,7 @@
+[app]
+build_directory = "./"
+sdk = "Rust"
+devices = ["nanox", "nanos+", "stax", "flex", "apex_p"]
+
+[tests]
+pytest_directory = "./tests/"
diff --git a/media/glyphs/home_nano_nbgl.png b/media/glyphs/home_nano_nbgl.png
new file mode 100644
index 0000000..4fa2028
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diff --git a/media/icons/mintlayer_32x32.gif b/media/icons/mintlayer_32x32.gif
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diff --git a/media/icons/mintlayer_40x40.gif b/media/icons/mintlayer_40x40.gif
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diff --git a/run_extra_checks.sh b/run_extra_checks.sh
new file mode 100755
index 0000000..681353e
--- /dev/null
+++ b/run_extra_checks.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# Run some extra checks.
+
+set -e
+set -o nounset
+
+SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
+
+cd "$SCRIPT_DIR"
+
+echo "Running codecheck.py"
+python3 "tools/codecheck.py"
+
+# Notes about clippy:
+# 1. Ledger's guideline enforcer also runs it. But at the moment of writing this it doesn't check
+#    tests, see https://github.com/LedgerHQ/ledger-app-workflows/blob/master/scripts/check_all.sh.
+#    Besides, we want to enable some additional checks, similar to what we do in Mintlayer Core,
+#    so we do a separate clippy run here.
+# 2. The guideline enforcer runs it for all existing device models, but in this additional run this
+#    is redundant, so we use one arbitrarily chosen model.
+# 3. Unlike in Mintlayer Core, we can't disable certain annoying and mostly useless checks (such as
+#    let-and-return), because the guideline enforcer will run them anyway.
+
+echo "Running cargo fmt"
+cargo fmt --check -- --config newline_style=Unix
+
+CLIPPY_TARGET_ARG=--target=apex_p
+
+echo "Running clippy (any code)"
+cargo clippy "$CLIPPY_TARGET_ARG" --all-features --workspace --bins --lib --tests  -- \
+    -D warnings \
+    -D clippy::implicit_saturating_sub \
+    -D clippy::implicit_clone \
+    -D clippy::map_unwrap_or \
+    -D clippy::unnested_or_patterns \
+    -D clippy::mut_mut \
+    -D clippy::todo
+
+echo "Running clippy (production code)"
+# TODO: consider also enabling `unwrap_used` and `items_after_statements`.
+cargo clippy "$CLIPPY_TARGET_ARG" --all-features --workspace --bins --lib -- \
+    -A clippy::all \
+    -D clippy::float_arithmetic \
+    -D clippy::dbg_macro \
+    -D clippy::fallible_impl_from \
+    -D clippy::string_slice
+
+echo "All checks passed"
diff --git a/run_unit_tests.sh b/run_unit_tests.sh
new file mode 100755
index 0000000..ce503e1
--- /dev/null
+++ b/run_unit_tests.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+set -e
+set -o nounset
+
+# Run unit tests.
+# The first argument must be the device model: nanox, nanosp, stax, flex or apex_p.
+# The second argument is optional (defaults to all) and specifies the crate whose tests must be run.
+
+SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
+
+cd "$SCRIPT_DIR"
+
+MODEL=$1
+PACKAGE=${2:-all}
+
+if [[ "$MODEL" == "nanosp" ]]; then
+    TARGET="nanosplus"
+else
+    TARGET="$MODEL"
+fi
+
+echo "*** Running unit tests on $MODEL ***"
+
+if [[ "$PACKAGE" == "all" ]]; then
+    PACKAGES=(mintlayer-app-core mintlayer-messages)
+else
+    PACKAGES=("$PACKAGE")
+fi
+
+for package in "${PACKAGES[@]}"; do
+    echo "*** Building unit tests for $package ***"
+
+    # Build the test with normal output and without capturing it, so that build errors, if any,
+    # are visible.
+    cargo test -p "$package" --release --no-run --target="$TARGET"
+
+    # Build the test again using `--message-format=json`, to capture the name of the test executable.
+    output=$(cargo test -p "$package" --release --no-run --message-format=json --target="$TARGET")
+    jq_selector='select(.reason == "compiler-artifact") | select(.profile.test == true) | select(.executable != null) | .executable'
+    test_exe_path=$(jq -r "$jq_selector" <<< "$output")
+
+    echo "*** Running unit tests for $package ***"
+    speculos --display headless --model "$MODEL" "$test_exe_path"
+done
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..ffbbd17
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly-2025-12-05"
+
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..dcf0260
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,29 @@
+/*****************************************************************************
+ *   Mintlayer Ledger App.
+ *   (c) 2023 Ledger SAS.
+ *   (c) 2025-2026 RBB S.r.l.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *****************************************************************************/
+
+#![no_std]
+#![no_main]
+
+use mintlayer_app_core::mintlayer_main;
+
+ledger_device_sdk::set_panic!(ledger_device_sdk::exiting_panic);
+
+#[no_mangle]
+extern "C" fn sample_main() {
+    mintlayer_main();
+}
diff --git a/tests/application_client/__init__.py b/tests/application_client/__init__.py
new file mode 100644
index 0000000..fbcf26c
--- /dev/null
+++ b/tests/application_client/__init__.py
@@ -0,0 +1,421 @@
+#  Copyright (c) 2025-2026 RBB S.r.l
+#  opensource@mintlayer.org
+#  SPDX-License-Identifier: MIT
+#  Licensed under the MIT License;
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#  https://github.com/mintlayer/mintlayer-core/blob/master/LICENSE
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+import scalecodec  # type: ignore
+
+MAINNET = 0
+TESTNET = 1
+REGTEST = 2
+SIGNET = 3
+
+
+def init_mintlayer_types():
+    custom_types = {
+        "types": {
+            "Bip32Path": "Vec<u32>",
+            "Amount": "Compact<u128>",
+            "H256": "[u8; 32]",
+            "BlockHeight": "Compact<u64>",
+            "BlockTimestamp": "Compact<u64>",
+            "OutputValue": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Coin", "Amount"],
+                    # Note: need to have this variant to make sure TokenV1's index is 2.
+                    # pylint: disable=fixme
+                    # TODO: the protocol should probably not use types from mintlayer core
+                    # primitives.
+                    # See https://github.com/mintlayer/mintlayer-ledger-app/issues/18.
+                    ["DeprecatedTokenV0", ""],
+                    ["TokenV1", "(TokenId, Amount)"],
+                ],
+            },
+            "InputAddressPath": {
+                "type": "struct",
+                "type_mapping": [
+                    ["path", "Vec<u32>"],
+                    ["multisig_idx", "Option<u32>"],
+                ],
+            },
+            "Destination": {
+                "type": "enum",
+                "type_mapping": [
+                    ["AnyoneCanSpend", "()"],
+                    ["PublicKeyHash", "PublicKeyHash"],
+                    ["PublicKey", "PublicKey"],
+                    ["ScriptHash", "ScriptId"],
+                    ["ClassicMultisig", "PublicKeyHash"],
+                ],
+            },
+            "PublicKeyHash": "[u8; 20]",
+            "PublicKey": {
+                "type": "struct",
+                "type_mapping": [
+                    ["key", "PublicKeyHolder"],
+                ],
+            },
+            "PublicKeyHolder": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Secp256k1Schnorr", "Secp256k1PublicKey"],
+                ],
+            },
+            "Secp256k1PublicKey": {
+                "type": "struct",
+                "type_mapping": [
+                    ["pubkey_data", "[u8; 33]"],
+                ],
+            },
+            "IsTokenFreezable": {
+                "type": "enum",
+                "type_mapping": [
+                    ["No", "()"],
+                    ["Yes", "()"],
+                ],
+            },
+            "TokenTotalSupply": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Fixed", "Amount"],
+                    ["Lockable", "()"],
+                    ["Unlimited", "()"],
+                ],
+            },
+            "TokenIssuanceV1": {
+                "type": "struct",
+                "type_mapping": [
+                    ["token_ticker", "Vec<u8>"],
+                    ["number_of_decimals", "u8"],
+                    ["metadata_uri", "Vec<u8>"],
+                    ["total_supply", "TokenTotalSupply"],
+                    ["authority", "Destination"],
+                    ["is_freezable", "IsTokenFreezable"],
+                ],
+            },
+            "TokenIssuance": {
+                "type": "enum",
+                # The Rust enum has an explicit codec index of 1 for the V1 variant.
+                # A placeholder is added for index 0 to ensure correct encoding.
+                "type_mapping": [
+                    ["_Unused", "()"],
+                    ["V1", "TokenIssuanceV1"],
+                ],
+            },
+            "TokenCreator": {
+                "type": "struct",
+                "type_mapping": [
+                    ["public_key", "PublicKey"],
+                ],
+            },
+            "Metadata": {
+                "type": "struct",
+                "type_mapping": [
+                    ["creator", "Option<TokenCreator>"],
+                    ["name", "Vec<u8>"],
+                    ["description", "Vec<u8>"],
+                    ["ticker", "Vec<u8>"],
+                    ["icon_uri", "Vec<u8>"],
+                    ["additional_metadata_uri", "Vec<u8>"],
+                    ["media_uri", "Vec<u8>"],
+                    ["media_hash", "Vec<u8>"],
+                ],
+            },
+            "NftIssuanceV0": {
+                "type": "struct",
+                "type_mapping": [
+                    ["metadata", "Metadata"],
+                ],
+            },
+            "NftIssuance": {
+                "type": "enum",
+                "type_mapping": [
+                    ["V0", "NftIssuanceV0"],
+                ],
+            },
+            "OrderData": {
+                "type": "struct",
+                "type_mapping": [
+                    ["conclude_key", "Destination"],
+                    ["ask", "OutputValue"],
+                    ["give", "OutputValue"],
+                ],
+            },
+            "TxOutput": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Transfer", "(OutputValue, Destination)"],
+                    ["LockThenTransfer", "(OutputValue, Destination, OutputTimeLock)"],
+                    ["Burn", "OutputValue"],
+                    ["CreateStakePool", "(PoolId, StakePoolData)"],
+                    ["ProduceBlockFromStake", "(Destination, PoolId)"],
+                    ["CreateDelegationId", "(Destination, PoolId)"],
+                    ["DelegateStaking", "(Amount, DelegationId)"],
+                    ["IssueFungibleToken", "TokenIssuance"],
+                    ["IssueNft", "(TokenId, NftIssuance, Destination)"],
+                    ["DataDeposit", "Vec<u8>"],
+                    ["Htlc", "(OutputValue, HashedTimelockContract)"],
+                    ["CreateOrder", "OrderData"],
+                ],
+            },
+            "HashedTimelockContract": {
+                "type": "struct",
+                "type_mapping": [
+                    ["secret_hash", "[u8; 20]"],
+                    ["spend_key", "Destination"],
+                    ["refund_timelock", "OutputTimeLock"],
+                    ["refund_key", "Destination"],
+                ],
+            },
+            "OutputTimeLock": {
+                "type": "enum",
+                "type_mapping": [
+                    ["UntilHeight", "BlockHeight"],
+                    ["UntilTime", "BlockTimestamp"],
+                    ["ForBlockCount", "Compact<u64>"],
+                    ["ForSeconds", "Compact<u64>"],
+                ],
+            },
+            "PoolId": "H256",
+            "DelegationId": "H256",
+            "TokenId": "H256",
+            "OrderId": "H256",
+            "StakePoolData": {
+                "type": "struct",
+                "type_mapping": [
+                    ["pledge", "Amount"],
+                    ["staker", "Destination"],
+                    ["vrf_public_key", "VRFPublicKey"],
+                    ["decommission_key", "Destination"],
+                    ["margin_ratio_per_thousand", "u16"],
+                    ["cost_per_block", "Amount"],
+                ],
+            },
+            "VRFPublicKey": {
+                "type": "struct",
+                "type_mapping": [
+                    ["key", "VRFPublicKeyHolder"],
+                ],
+            },
+            "VRFPublicKeyHolder": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Schnorrkel", "SchnorrkelPublicKey"],
+                ],
+            },
+            "SchnorrkelPublicKey": {
+                "type": "struct",
+                "type_mapping": [
+                    ["key", "[u8; 32]"],
+                ],
+            },
+            "OutPointSourceId": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Transaction", "H256"],
+                    ["BlockReward", "H256"],
+                ],
+            },
+            "OutPoint": {
+                "type": "struct",
+                "type_mapping": [
+                    ["id", "OutPointSourceId"],
+                    ["index", "u32"],
+                ],
+            },
+            "AccountNonce": "Compact<u64>",
+            "IsTokenUnfreezable": {
+                "type": "enum",
+                "type_mapping": [
+                    ["No", "()"],
+                    ["Yes", "()"],
+                ],
+            },
+            "AccountCommand": {
+                "type": "enum",
+                "type_mapping": [
+                    ["MintTokens", "(TokenId, Amount)"],
+                    ["UnmintTokens", "TokenId"],
+                    ["LockTokenSupply", "TokenId"],
+                    ["FreezeToken", "(TokenId, IsTokenUnfreezable)"],
+                    ["UnfreezeToken", "TokenId"],
+                    ["ChangeTokenAuthority", "(TokenId, Destination)"],
+                    ["ConcludeOrder", "OrderId"],
+                    ["FillOrder", "(OrderId, Amount, Destination)"],
+                    ["ChangeTokenMetadataUri", "(TokenId, Vec<u8>)"],
+                ],
+            },
+            "OrderAccountCommand": {
+                "type": "enum",
+                "type_mapping": [
+                    ["FillOrder", "(OrderId, Amount)"],
+                    ["FreezeOrder", "OrderId"],
+                    ["ConcludeOrder", "OrderId"],
+                ],
+            },
+            "TxInputWithAdditionalInfo": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Utxo", "(OutPoint, AdditionalUtxoInfo)"],
+                    ["Account", "AccountOutPoint"],
+                    ["AccountCommand", "(AccountNonce, AccountCommand)"],
+                    [
+                        "OrderAccountCommand",
+                        "(OrderAccountCommand, AdditionalOrderInfo)",
+                    ],
+                ],
+            },
+            "AccountOutPoint": {
+                "type": "struct",
+                "type_mapping": [
+                    ["nonce", "Compact<u64>"],
+                    ["spending", "AccountSpending"],
+                ],
+            },
+            "AccountSpending": {
+                "type": "enum",
+                "type_mapping": [
+                    ["DelegationBalance", "(H256, Amount)"],
+                ],
+            },
+            "SighashInputCommitment": {
+                "type": "enum",
+                "type_mapping": [
+                    ["None", "()"],
+                    ["Utxo", "TxOutput"],
+                    ["ProduceBlockFromStakeUtxo", "(TxOutput, Amount)"],
+                    ["FillOrderAccountCommand", "(OutputValue, OutputValue)"],
+                    [
+                        "ConcludeOrderAccountCommand",
+                        "(OutputValue, OutputValue, Amount, Amount)",
+                    ],
+                ],
+            },
+            "SignTxStartReq": {
+                "type": "struct",
+                "type_mapping": [
+                    ["coin", "u8"],
+                    ["version", "u8"],
+                    ["num_inputs", "u32"],
+                    ["num_outputs", "u32"],
+                ],
+            },
+            "TxInputData": {
+                "type": "struct",
+                "type_mapping": [
+                    ["addresses", "Vec<InputAddressPath>"],
+                    ["input", "TxInputWithAdditionalInfo"],
+                ],
+            },
+            "TxInputCommitmentData": {
+                "type": "struct",
+                "type_mapping": [
+                    ["commitment", "SighashInputCommitment"],
+                ],
+            },
+            "UtxoWithPoolData": {
+                "type": "struct",
+                "type_mapping": [
+                    ["utxo", "TxOutput"],
+                    ["staker_balance", "Amount"],
+                ],
+            },
+            "AdditionalUtxoInfo": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Utxo", "TxOutput"],
+                    ["UtxoWithPoolData", "UtxoWithPoolData"],
+                ],
+            },
+            "AdditionalOrderInfo": {
+                "type": "struct",
+                "type_mapping": [
+                    ["initially_asked", "OutputValue"],
+                    ["initially_given", "OutputValue"],
+                    ["ask_balance", "Amount"],
+                    ["give_balance", "Amount"],
+                ],
+            },
+            "TxOutputData": {
+                "type": "struct",
+                "type_mapping": [
+                    ["output", "TxOutput"],
+                ],
+            },
+            "SignTxNextReq": {
+                "type": "enum",
+                "type_mapping": [
+                    ["ProcessInput", "TxInputData"],
+                    ["ProcessInputCommitment", "TxInputCommitmentData"],
+                    ["ProcessOutput", "TxOutputData"],
+                    ["ReturnNextSignature", "()"],
+                ],
+            },
+            "SignatureInResponse": "[u8; 64]",
+            "TxInputSignatureResponse": {
+                "type": "struct",
+                "type_mapping": [
+                    ["signature", "SignatureInResponse"],
+                    ["input_idx", "u32"],
+                    ["multisig_idx", "Option<u32>"],
+                    ["has_next", "bool"],
+                ],
+            },
+            "UncompressedSecp256k1PublicKey": "[u8; 65]",
+            "ChainCode": "[u8; 32]",
+            "PublicKeyResponse": {
+                "type": "struct",
+                "type_mapping": [
+                    ["public_key", "UncompressedSecp256k1PublicKey"],
+                    ["chain_code", "ChainCode"],
+                ],
+            },
+            "MsgSignatureResponse": {
+                "type": "struct",
+                "type_mapping": [
+                    ["signature", "SignatureInResponse"],
+                ],
+            },
+            "Response": {
+                "type": "enum",
+                "type_mapping": [
+                    ["ExpectingNextChunk", "()"],
+                    ["PublicKey", "PublicKeyResponse"],
+                    ["TxSetup", "()"],
+                    ["TxNext", "()"],
+                    ["TxInputSignature", "TxInputSignatureResponse"],
+                    ["MessageSetup", "()"],
+                    ["MessageSignature", "MsgSignatureResponse"],
+                    ["Pong", "()"],
+                ],
+            },
+            "TxInput": {
+                "type": "enum",
+                "type_mapping": [
+                    ["Utxo", "OutPoint"],
+                    ["Account", "AccountOutPoint"],
+                    ["AccountCommand", "(AccountNonce, AccountCommand)"],
+                    [
+                        "OrderAccountCommand",
+                        "OrderAccountCommand",
+                    ],
+                ],
+            },
+        }
+    }
+
+    scalecodec.base.RuntimeConfiguration().update_type_registry(custom_types)
+
+
+init_mintlayer_types()
diff --git a/tests/application_client/mintlayer_command_sender.py b/tests/application_client/mintlayer_command_sender.py
new file mode 100644
index 0000000..529b330
--- /dev/null
+++ b/tests/application_client/mintlayer_command_sender.py
@@ -0,0 +1,534 @@
+from contextlib import contextmanager
+from dataclasses import dataclass
+from enum import IntEnum
+from typing import Generator, List
+
+import scalecodec  # type: ignore
+from ragger.backend.interface import RAPDU, BackendInterface
+from ragger.navigator import NavInsID
+from ragger.navigator.navigation_scenario import NavigationScenarioData, UseCase
+
+from .mintlayer_response_unpacker import (
+    unpack_get_public_key_response,
+)
+from .mintlayer_utils import (
+    Transaction,
+    TxInputSignatureResponse,
+    TxInputSignature,
+    decode_response_variant,
+    sign_tx_start_req_obj,
+    sign_tx_next_req_obj,
+    verify_tx_signature,
+)
+
+MAX_APDU_LEN: int = 255
+
+CLA: int = 0xE1
+
+
+@dataclass
+class ReviewTransaction:
+    transaction: Transaction
+    has_command_input: bool
+    review_custom_screen_text: str
+
+
+@dataclass
+class SignTxStep:
+    kind: str
+
+
+class GetAppAndVersionP1(IntEnum):
+    # Parameter 1 for first APDU number.
+    P1_START = 0x00
+    P1_NEXT = 0x01
+
+
+class SignTxP1(IntEnum):
+    # Parameter 1 for first APDU number.
+    P1_START = 0x00
+    P1_NEXT = 0x01
+
+
+class SignMessageP1(IntEnum):
+    # Parameter 1 for first APDU number.
+    P1_START = 0x00
+    P1_NEXT = 0x01
+
+
+class GetPublicKeyP1(IntEnum):
+    P1_DO_NOT_CONFIRM = 0x00
+    # Parameter 1 for screen confirmation for GET_PUBLIC_KEY.
+    P1_CONFIRM = 0x01
+
+
+class P2(IntEnum):
+    # Parameter 2 for last APDU to receive.
+    P2_LAST = 0x00
+    # Parameter 2 for more APDU to receive.
+    P2_MORE = 0x80
+
+
+class InsType(IntEnum):
+    GET_PUBLIC_KEY = 0x00
+    SIGN_TX = 0x01
+    SIGN_MESSAGE = 0x02
+    PING = 0x03
+
+
+class Errors(IntEnum):
+    SW_DENY = 0x6985
+    SW_CLA_NOT_SUPPORTED = 0x6E00
+    SW_INS_NOT_SUPPORTED = 0x6E01
+    SW_WRONG_P1P2 = 0x6E02
+    SW_WRONG_APDU_LENGTH = 0x6E03
+
+    SW_TX_DISPLAY_FAIL = 0xB000
+    SW_TX_LOCK_TIME_INVALID = 0xB001
+    SW_WRONG_TX_LENGTH = 0xB002
+    SW_WRONG_CONTEXT = 0xB008
+    SW_DESERIALIZE_FAIL = 0xB009
+    SW_MAX_BUFFER_LEN_EXCEEDED = 0xB012
+
+
+def split_message(message: bytes, max_size: int) -> List[bytes]:
+    if len(message) == 0:
+        return [b""]
+
+    return [message[x : x + max_size] for x in range(0, len(message), max_size)]
+
+
+class MintlayerCommandSender:
+    def __init__(self, backend: BackendInterface) -> None:
+        self.backend = backend
+
+    def get_app_and_version(self) -> RAPDU:
+        return self.backend.exchange(
+            cla=0xB0,  # specific CLA for BOLOS
+            ins=0x01,  # specific INS for get_app_and_version
+            p1=GetAppAndVersionP1.P1_START,
+            p2=P2.P2_LAST,
+            data=b"",
+        )
+
+    def get_public_key(self, coin: int, path: str) -> RAPDU:
+        data = coin.to_bytes(1, "little") + pack_derivation_path_from_str(path)
+
+        return self.backend.exchange(
+            cla=CLA,
+            ins=InsType.GET_PUBLIC_KEY,
+            p1=GetPublicKeyP1.P1_DO_NOT_CONFIRM,
+            p2=P2.P2_LAST,
+            data=data,
+        )
+
+    def get_public_key_by_ints_path(self, coin: int, path: list[int]) -> RAPDU:
+        data = coin.to_bytes(1, "little") + pack_derivation_path_from_ints(path)
+
+        return self.backend.exchange(
+            cla=CLA,
+            ins=InsType.GET_PUBLIC_KEY,
+            p1=GetPublicKeyP1.P1_DO_NOT_CONFIRM,
+            p2=P2.P2_LAST,
+            data=data,
+        )
+
+    @contextmanager
+    def get_public_key_with_confirmation(
+        self, coin: int, path: str
+    ) -> Generator[None, None, None]:
+        data = coin.to_bytes(1, "little") + pack_derivation_path_from_str(path)
+
+        with self.backend.exchange_async(
+            cla=CLA,
+            ins=InsType.GET_PUBLIC_KEY,
+            p1=GetPublicKeyP1.P1_CONFIRM,
+            p2=P2.P2_LAST,
+            data=data,
+        ):
+            yield
+
+    @contextmanager
+    def sign_message(
+        self, coin: int, addr_type: int, path: str, message: bytes
+    ) -> Generator[None, None, None]:
+        data = (
+            coin.to_bytes(1, "little")
+            + addr_type.to_bytes(1, "little")
+            + pack_derivation_path_from_str(path)
+        )
+
+        response = self.backend.exchange(
+            cla=CLA,
+            ins=InsType.SIGN_MESSAGE,
+            p1=SignMessageP1.P1_START,
+            p2=P2.P2_LAST,
+            data=data,
+        )
+        decode_response_variant(response.data, "MessageSetup")
+
+        chunks = split_message(message, MAX_APDU_LEN)
+
+        for chunk in chunks[:-1]:
+            response = self.backend.exchange(
+                cla=CLA,
+                ins=InsType.SIGN_MESSAGE,
+                p1=SignMessageP1.P1_NEXT,
+                p2=P2.P2_MORE,
+                data=chunk,
+            )
+            decode_response_variant(response.data, "ExpectingNextChunk")
+
+        with self.backend.exchange_async(
+            cla=CLA,
+            ins=InsType.SIGN_MESSAGE,
+            p1=SignMessageP1.P1_NEXT,
+            p2=P2.P2_LAST,
+            data=chunks[-1],
+        ):
+            yield
+
+    # pylint: disable-next=too-many-locals
+    def sign_tx(self, transaction: Transaction) -> Generator[SignTxStep, None, None]:
+        # ---- Start req ----
+        start_req = sign_tx_start_req_obj.encode(
+            {
+                "coin": transaction.coin,
+                "version": 0,
+                "num_inputs": len(transaction.inputs),
+                "num_outputs": len(transaction.outputs),
+            }
+        ).data
+
+        response = self.backend.exchange(
+            cla=CLA,
+            ins=InsType.SIGN_TX,
+            p1=SignTxP1.P1_START,
+            p2=P2.P2_LAST,
+            data=bytes(start_req),
+        )
+        decode_response_variant(response.data, "TxSetup")
+
+        # ---- INPUTS ----
+        print("sending inputs", len(transaction.inputs))
+
+        def encode_input(inp):
+            return sign_tx_next_req_obj.encode({"ProcessInput": inp}).data
+
+        def encode_input_comm(comm):
+            return sign_tx_next_req_obj.encode({"ProcessInputCommitment": comm}).data
+
+        def encode_output(outp):
+            return sign_tx_next_req_obj.encode({"ProcessOutput": outp}).data
+
+        for inp in transaction.inputs:
+            encoded_inp = encode_input(inp)
+            self._send_chunked_sync(encoded_inp, "TxNext")
+
+        # ---- INPUT COMMITMENTS ----
+        print("sending input commitments")
+
+        for comm in transaction.input_commitments[:-1]:
+            encoded_comm = encode_input_comm(comm)
+            self._send_chunked_sync(encoded_comm, "TxNext")
+
+        encoded_comm = encode_input_comm(transaction.input_commitments[-1])
+        chunks = split_message(encoded_comm, MAX_APDU_LEN)
+
+        # all but last chunk sync
+        for chunk in chunks[:-1]:
+            response = self.backend.exchange(
+                cla=CLA,
+                ins=InsType.SIGN_TX,
+                p1=SignTxP1.P1_NEXT,
+                p2=P2.P2_MORE,
+                data=chunk,
+            )
+            decode_response_variant(response.data, "ExpectingNextChunk")
+
+        # last chunk async -> UI review
+        with self.backend.exchange_async(
+            cla=CLA,
+            ins=InsType.SIGN_TX,
+            p1=SignTxP1.P1_NEXT,
+            p2=P2.P2_LAST,
+            data=chunks[-1],
+        ):
+            yield SignTxStep(kind="start")
+
+            if len(transaction.outputs) == 0:
+                yield SignTxStep(kind="sign")
+
+        response = self.get_async_response()
+        decode_response_variant(response.data, "TxNext")
+
+        # ---- OUTPUTS ----
+        print("streaming outputs")
+
+        for idx, out in enumerate(transaction.outputs):
+            print(f"sending output {idx}")
+
+            encoded_out = encode_output(out)
+            chunks = split_message(encoded_out, MAX_APDU_LEN)
+
+            # all but last chunk sync
+            for chunk in chunks[:-1]:
+                response = self.backend.exchange(
+                    cla=CLA,
+                    ins=InsType.SIGN_TX,
+                    p1=SignTxP1.P1_NEXT,
+                    p2=P2.P2_MORE,
+                    data=chunk,
+                )
+                decode_response_variant(response.data, "ExpectingNextChunk")
+
+            # last chunk async -> UI review
+            with self.backend.exchange_async(
+                cla=CLA,
+                ins=InsType.SIGN_TX,
+                p1=SignTxP1.P1_NEXT,
+                p2=P2.P2_LAST,
+                data=chunks[-1],
+            ):
+                kind = "sign" if idx == len(transaction.outputs) - 1 else "output"
+                yield SignTxStep(kind=kind)
+
+            response = self.get_async_response()
+            decode_response_variant(response.data, "TxNext")
+
+    def _send_chunked_sync(self, data: bytes, expected_last_response_variant: str):
+        chunks = split_message(data, MAX_APDU_LEN)
+
+        for chunk in chunks[:-1]:
+            response = self.backend.exchange(
+                cla=CLA,
+                ins=InsType.SIGN_TX,
+                p1=SignTxP1.P1_NEXT,
+                p2=P2.P2_MORE,
+                data=chunk,
+            )
+            decode_response_variant(response.data, "ExpectingNextChunk")
+
+        response = self.backend.exchange(
+            cla=CLA,
+            ins=InsType.SIGN_TX,
+            p1=SignTxP1.P1_NEXT,
+            p2=P2.P2_LAST,
+            data=chunks[-1],
+        )
+        return decode_response_variant(response.data, expected_last_response_variant)
+
+    def get_async_response(self) -> RAPDU:
+        response = self.backend.last_async_response
+        assert response is not None
+        return response
+
+    def get_all_signatures(self, transaction: Transaction) -> List[TxInputSignature]:
+        next_sig = sign_tx_next_req_obj.encode({"ReturnNextSignature": None}).data
+        sigs = []
+        expected_sigs_count = len(transaction.expected_sig_indices())
+
+        while True:
+            res = self.backend.exchange(
+                cla=CLA,
+                ins=InsType.SIGN_TX,
+                p1=SignTxP1.P1_NEXT,
+                p2=P2.P2_LAST,
+                data=next_sig,
+            )
+            res = TxInputSignatureResponse.from_data(res.data)
+
+            sigs.append(TxInputSignature.from_response(res))
+
+            if not res.has_next:
+                break
+
+            assert len(sigs) < expected_sigs_count, (
+                "has_next is still true after the expected number of signatures "
+                f"have been received (sigs = {sigs!r})"
+            )
+        return sigs
+
+
+def hardened_index(index: int) -> int:
+    return index | 1 << 31
+
+
+def parse_derivation_path(derivation_path: str) -> list[int]:
+    split = derivation_path.split("/")
+
+    if split[0] != "m":
+        raise ValueError("Error master expected")
+
+    result = []
+    for value in split[1:]:
+        if value == "":
+            raise ValueError(f'Error missing value in split list "{split}"')
+        if value.endswith("'"):
+            result.append(hardened_index(int(value[:-1])))
+        else:
+            result.append(int(value))
+
+    return result
+
+
+def pack_derivation_path_from_str(path: str) -> bytes:
+    parsed_path = parse_derivation_path(path)
+    return pack_derivation_path_from_ints(parsed_path)
+
+
+def pack_derivation_path_from_ints(path: list[int]) -> bytes:
+    path_obj = scalecodec.base.RuntimeConfiguration().create_scale_object("Bip32Path")
+    return path_obj.encode(path).data
+
+
+# pylint: disable-next=too-many-locals,too-many-branches,too-many-statements
+def sign_tx_review(
+    client,
+    device,
+    navigator,
+    scenario_navigator,
+    review_transaction: ReviewTransaction,
+):
+    transaction = review_transaction.transaction
+    has_command_input = review_transaction.has_command_input
+    review_custom_screen_text = review_transaction.review_custom_screen_text
+
+    addr_paths_by_indices = transaction.addr_paths_by_indices()
+    pubkeys_by_indices = {}
+    for indices, addr_path in addr_paths_by_indices.items():
+        pubkey_rapdu = client.get_public_key_by_ints_path(transaction.coin, addr_path)
+        _, pubkey, _, _ = unpack_get_public_key_response(pubkey_rapdu.data)
+
+        pubkeys_by_indices[indices] = pubkey
+
+    # The snapshot index (used to make its name) and the amount by which it should be increased
+    # after each step. The increase should be large enough, so that snapshots from later steps
+    # don't overwrite the previous ones (10 is not enough).
+    start_idx = 0
+    idx_inc = 100
+
+    if not device.is_nano:
+        instruction = NavInsID.SWIPE_CENTER_TO_LEFT
+    else:
+        instruction = NavInsID.RIGHT_CLICK
+
+    last_page_pattern = r".*\((\d+)/\1\)$"
+
+    for step in client.sign_tx(transaction):
+        print("step kind: ", step.kind)
+        if step.kind == "start":
+            navigator.navigate_and_compare(
+                path=scenario_navigator.screenshot_path,
+                test_case_name=scenario_navigator.test_name,
+                instructions=[instruction],
+                screen_change_before_first_instruction=False,
+                screen_change_after_last_instruction=False,
+                snap_start_idx=start_idx,
+            )
+            start_idx += idx_inc
+
+            if has_command_input:
+                if device.is_nano:
+                    navigator.navigate_until_text_and_compare(
+                        navigate_instruction=instruction,
+                        validation_instructions=[instruction],
+                        text=last_page_pattern,
+                        path=scenario_navigator.screenshot_path,
+                        test_case_name=scenario_navigator.test_name,
+                        screen_change_before_first_instruction=False,
+                        screen_change_after_last_instruction=False,
+                        snap_start_idx=start_idx,
+                    )
+                else:
+                    navigator.navigate_and_compare(
+                        path=scenario_navigator.screenshot_path,
+                        test_case_name=scenario_navigator.test_name,
+                        instructions=[instruction] * 2,
+                        screen_change_before_first_instruction=False,
+                        screen_change_after_last_instruction=False,
+                        snap_start_idx=start_idx,
+                    )
+                start_idx += idx_inc
+
+        if step.kind == "output":
+            if device.is_nano:
+                navigator.navigate_until_text_and_compare(
+                    navigate_instruction=instruction,
+                    validation_instructions=[instruction],
+                    text=last_page_pattern,
+                    path=scenario_navigator.screenshot_path,
+                    test_case_name=scenario_navigator.test_name,
+                    screen_change_before_first_instruction=False,
+                    screen_change_after_last_instruction=False,
+                    snap_start_idx=start_idx,
+                )
+            else:
+                navigator.navigate_and_compare(
+                    path=scenario_navigator.screenshot_path,
+                    test_case_name=scenario_navigator.test_name,
+                    instructions=[instruction] * 2,
+                    screen_change_before_first_instruction=False,
+                    screen_change_after_last_instruction=False,
+                    snap_start_idx=start_idx,
+                )
+            start_idx += idx_inc
+
+        elif step.kind == "sign":
+            scenario = NavigationScenarioData(
+                scenario_navigator.device,
+                scenario_navigator.backend,
+                UseCase.TX_REVIEW,
+                True,
+            )
+
+            if device.is_nano:
+                validation_instructions = scenario.validation
+            else:
+                # On touch devices `UseCase.TX_REVIEW` sets `scenario.validation` to
+                # `[USE_CASE_REVIEW_CONFIRM, USE_CASE_STATUS_DISMISS]`. But the status screen
+                # appears only after the last `ReturnNextSignature`.
+                validation_instructions = [NavInsID.USE_CASE_REVIEW_CONFIRM]
+
+            navigator.navigate_until_text_and_compare(
+                navigate_instruction=scenario.navigation,
+                validation_instructions=validation_instructions,
+                text=review_custom_screen_text,
+                path=scenario_navigator.screenshot_path,
+                test_case_name=scenario_navigator.test_name,
+                screen_change_after_last_instruction=False,
+                snap_start_idx=start_idx,
+            )
+            start_idx += idx_inc
+
+    # After review approval, explicitly request every signature.
+    signatures = client.get_all_signatures(transaction)
+
+    # The last ReturnNextSignature is what makes the tx Finished, so the "Transaction signed"
+    # status screen is expected here.
+    validation_instructions = (
+        [] if device.is_nano else [NavInsID.USE_CASE_STATUS_DISMISS]
+    )
+    navigator.navigate_until_text_and_compare(
+        navigate_instruction=NavInsID.WAIT_FOR_SCREEN_CHANGE,
+        validation_instructions=validation_instructions,
+        text=r"^Transaction signed$",
+        path=scenario_navigator.screenshot_path,
+        test_case_name=scenario_navigator.test_name,
+        screen_change_before_first_instruction=False,
+        screen_change_after_last_instruction=False,
+        snap_start_idx=start_idx,
+    )
+
+    sig_indices = {sig.indices() for sig in signatures}
+    expected_sig_indices = transaction.expected_sig_indices()
+    assert (
+        sig_indices == expected_sig_indices
+    ), f"Sig indices don't match, expected: {expected_sig_indices}, actual: {sig_indices}"
+
+    addr_paths_by_indices = transaction.addr_paths_by_indices()
+
+    for sig in signatures:
+        pubkey = pubkeys_by_indices[sig.indices()]
+        sig_valid = verify_tx_signature(transaction, pubkey, sig.signature)
+        assert sig_valid, f"Signature verification failed for {sig.indices()}"
diff --git a/tests/application_client/mintlayer_response_unpacker.py b/tests/application_client/mintlayer_response_unpacker.py
new file mode 100644
index 0000000..2f30f24
--- /dev/null
+++ b/tests/application_client/mintlayer_response_unpacker.py
@@ -0,0 +1,76 @@
+from struct import unpack
+from typing import Tuple
+
+from .mintlayer_utils import decode_response_variant
+
+
+# remainder, data_len, data
+def pop_sized_buf_from_buffer(buffer: bytes, size: int) -> Tuple[bytes, bytes]:
+    return buffer[size:], buffer[0:size]
+
+
+# remainder, data_len, data
+def pop_size_prefixed_buf_from_buf(buffer: bytes) -> Tuple[bytes, int, bytes]:
+    data_len = buffer[0]
+    return buffer[1 + data_len :], data_len, buffer[1 : data_len + 1]
+
+
+# Unpack from response:
+# response = app_name (var)
+def unpack_get_app_name_response(response: bytes) -> str:
+    return response.decode("ascii")
+
+
+# Unpack from response:
+# response = MAJOR (1)
+#            MINOR (1)
+#            PATCH (1)
+def unpack_get_version_response(response: bytes) -> Tuple[int, int, int]:
+    assert len(response) == 3
+    major, minor, patch = unpack("BBB", response)
+    return (major, minor, patch)
+
+
+# Unpack from response:
+# response = format_id (1)
+#            app_name_raw_len (1)
+#            app_name_raw (var)
+#            version_raw_len (1)
+#            version_raw (var)
+#            unused_len (1)
+#            unused (var)
+def unpack_get_app_and_version_response(response: bytes) -> Tuple[str, str]:
+    response, _ = pop_sized_buf_from_buffer(response, 1)
+    response, _, app_name_raw = pop_size_prefixed_buf_from_buf(response)
+    response, _, version_raw = pop_size_prefixed_buf_from_buf(response)
+    response, _, _ = pop_size_prefixed_buf_from_buf(response)
+
+    assert len(response) == 0
+
+    return app_name_raw.decode("ascii"), version_raw.decode("ascii")
+
+
+# Unpack from response:
+def unpack_get_public_key_response(response: bytes) -> Tuple[int, bytes, int, bytes]:
+    msg = decode_response_variant(response, "PublicKey")
+    print(msg)
+
+    pub_key = bytes.fromhex(msg["public_key"][2:])
+    pub_key_len = len(pub_key)
+    chain_code = bytes.fromhex(msg["chain_code"][2:])
+    chain_code_len = len(chain_code)
+
+    print(pub_key_len, pub_key)
+    print(chain_code_len, chain_code)
+
+    assert pub_key_len == 65
+    assert chain_code_len == 32
+    return pub_key_len, pub_key, chain_code_len, chain_code
+
+
+# Unpack from response:
+def unpack_sign_message_response(response: bytes) -> bytes:
+    resp = decode_response_variant(response, "MessageSignature")
+    signature = bytes.fromhex(resp["signature"][2:])
+    assert len(signature) == 64
+    return signature
diff --git a/tests/application_client/mintlayer_utils.py b/tests/application_client/mintlayer_utils.py
new file mode 100644
index 0000000..ebd1220
--- /dev/null
+++ b/tests/application_client/mintlayer_utils.py
@@ -0,0 +1,201 @@
+from dataclasses import dataclass
+from hashlib import blake2b
+from typing import List, Optional
+
+from coincurve import PublicKeyXOnly
+import scalecodec  # type: ignore
+
+sign_tx_start_req_obj = scalecodec.base.RuntimeConfiguration().create_scale_object(
+    "SignTxStartReq"
+)
+sign_tx_next_req_obj = scalecodec.base.RuntimeConfiguration().create_scale_object(
+    "SignTxNextReq"
+)
+compact_u32_obj = scalecodec.base.RuntimeConfiguration().create_scale_object(
+    "Compact<u32>"
+)
+tx_input_obj = scalecodec.base.RuntimeConfiguration().create_scale_object("TxInput")
+tx_input_commitment_obj = scalecodec.base.RuntimeConfiguration().create_scale_object(
+    "SighashInputCommitment"
+)
+tx_output_obj = scalecodec.base.RuntimeConfiguration().create_scale_object("TxOutput")
+
+
+@dataclass
+class TxInputSignatureResponse:
+    signature: bytes
+    input_idx: int
+    multisig_idx: Optional[int]
+    has_next: bool
+
+    @staticmethod
+    def from_data(response: bytes):
+        decoded_response = decode_response_variant(response, "TxInputSignature")
+
+        signature = bytes.fromhex(decoded_response["signature"][2:])
+        assert len(signature) == 64
+
+        return TxInputSignatureResponse(
+            signature=signature,
+            input_idx=decoded_response["input_idx"],
+            multisig_idx=decoded_response["multisig_idx"],
+            has_next=decoded_response["has_next"],
+        )
+
+
+@dataclass(frozen=True)
+class TxInputSignatureIndices:
+    input_idx: int
+    multisig_idx: Optional[int]
+
+
+@dataclass
+class TxInputSignature:
+    signature: bytes
+    input_idx: int
+    multisig_idx: Optional[int]
+
+    @staticmethod
+    def from_response(response: TxInputSignatureResponse):
+        return TxInputSignature(
+            signature=response.signature,
+            input_idx=response.input_idx,
+            multisig_idx=response.multisig_idx,
+        )
+
+    def indices(self) -> TxInputSignatureIndices:
+        return TxInputSignatureIndices(
+            input_idx=self.input_idx,
+            multisig_idx=self.multisig_idx,
+        )
+
+
+@dataclass
+class Transaction:
+    coin: int
+    # A list of TxInputData objects.
+    inputs: List[dict]
+    # A list of TxInputCommitmentData objects.
+    input_commitments: List[dict]
+    # A list of TxOutputData objects.
+    outputs: List[dict]
+
+    # Extract key derivation path for each input_idx/multisig_idx combination
+    # and return it as a dict.
+    def addr_paths_by_indices(self) -> dict[TxInputSignatureIndices, list[int]]:
+        result = {}
+        for input_idx, inp in enumerate(self.inputs):
+            for addr in inp["addresses"]:
+                multisig_idx = addr["multisig_idx"]
+                indices = TxInputSignatureIndices(
+                    input_idx=input_idx, multisig_idx=multisig_idx
+                )
+
+                result[indices] = addr["path"]
+
+        return result
+
+    def expected_sig_indices(self) -> set[TxInputSignatureIndices]:
+        return set(self.addr_paths_by_indices())
+
+    def digest_for_signing(self) -> bytes:
+        encoded_inputs = b""
+        for inp_data in self.inputs:
+            inp_with_info = inp_data["input"]
+            if "Utxo" in inp_with_info:
+                inp = {"Utxo": inp_with_info["Utxo"][0]}
+            elif "Account" in inp_with_info:
+                inp = {"Account": inp_with_info["Account"]}
+            elif "AccountCommand" in inp_with_info:
+                inp = {"AccountCommand": inp_with_info["AccountCommand"]}
+            elif "OrderAccountCommand" in inp_with_info:
+                inp = {"OrderAccountCommand": inp_with_info["OrderAccountCommand"][0]}
+            else:
+                raise ValueError("Unexpected input")
+
+            encoded_inputs += tx_input_obj.encode(inp).data
+
+        encoded_input_commitments = b""
+        for inp_comm in self.input_commitments:
+            comm = inp_comm["commitment"]
+            encoded_input_commitments += tx_input_commitment_obj.encode(comm).data
+
+        encoded_outputs = b""
+        for outp_data in self.outputs:
+            outp = outp_data["output"]
+            encoded_outputs += tx_output_obj.encode(outp).data
+
+        assert len(self.input_commitments) == len(self.inputs)
+
+        num_inputs_as_le_bytes = len(self.inputs).to_bytes(4, "little")
+        compact_encoded_num_outputs = compact_u32_obj.encode(len(self.outputs)).data
+
+        preimage = (
+            b"\x01"  # SigHashType::ALL
+            + b"\x01"  # version
+            + bytes(16)  # zero flags
+            + num_inputs_as_le_bytes
+            + encoded_inputs
+            + num_inputs_as_le_bytes
+            + encoded_input_commitments
+            + compact_encoded_num_outputs
+            + encoded_outputs
+        )
+
+        tx_hash = mintlayer_hash(mintlayer_hash(preimage))
+        return tx_hash
+
+
+def decode_response(response: bytes) -> dict:
+    response_bytes = scalecodec.base.ScaleBytes(response)
+    response_obj = scalecodec.base.RuntimeConfiguration().create_scale_object(
+        "Response", data=response_bytes
+    )
+    return response_obj.decode()
+
+
+def decode_response_variant(response: bytes, expected_variant: str) -> dict:
+    decoded_response = decode_response(response)
+
+    assert (
+        isinstance(decoded_response, dict)
+        and len(decoded_response) == 1
+        and expected_variant in decoded_response
+    ), f"Expecting a dict with a single key '{expected_variant}', but got: {decoded_response!r}"
+
+    return decoded_response[expected_variant]
+
+
+def mintlayer_hash(data: bytes) -> bytes:
+    return blake2b(data, digest_size=64).digest()[:32]
+
+
+MESSAGE_MAGIC_PREFIX = b"===MINTLAYER MESSAGE BEGIN===\n"
+MESSAGE_MAGIC_SUFFIX = b"\n===MINTLAYER MESSAGE END==="
+
+
+def mintlayer_message_digest(message: bytes) -> bytes:
+    framed = MESSAGE_MAGIC_PREFIX + message + MESSAGE_MAGIC_SUFFIX
+    return mintlayer_hash(mintlayer_hash(framed))
+
+
+def xonly_pubkey(public_key: bytes) -> bytes:
+    if len(public_key) == 32:
+        return public_key
+    if len(public_key) == 33 and public_key[0] in (0x02, 0x03):
+        return public_key[1:33]
+    if len(public_key) == 65 and public_key[0] == 0x04:
+        return public_key[1:33]
+    raise ValueError(
+        "Expected x-only, compressed, or uncompressed secp256k1 public key"
+    )
+
+
+def verify_message_signature(msg: bytes, pubkey: bytes, sig: bytes) -> bool:
+    digest = mintlayer_message_digest(msg)
+    return PublicKeyXOnly(xonly_pubkey(pubkey)).verify(sig, digest)
+
+
+def verify_tx_signature(tx: Transaction, pubkey: bytes, sig: bytes) -> bool:
+    digest = tx.digest_for_signing()
+    return PublicKeyXOnly(xonly_pubkey(pubkey)).verify(sig, digest)
diff --git a/tests/application_client/py.typed b/tests/application_client/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..0315a04
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,19 @@
+import pytest
+from ragger.conftest import configuration
+from ragger.navigator import NavInsID
+
+###########################
+### CONFIGURATION START ###
+###########################
+
+# You can configure optional parameters by overriding the value of ragger.configuration.OPTIONAL_CONFIGURATION
+# Please refer to ragger/conftest/configuration.py for their descriptions and accepted values
+
+configuration.OPTIONAL.CUSTOM_SEED = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"
+
+#########################
+### CONFIGURATION END ###
+#########################
+
+# Pull all features from the base ragger conftest using the overridden configuration
+pytest_plugins = ("ragger.conftest.base_conftest",)
diff --git a/tests/regenerate_snapshots.sh b/tests/regenerate_snapshots.sh
new file mode 100755
index 0000000..fce36e4
--- /dev/null
+++ b/tests/regenerate_snapshots.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -e
+set -o nounset
+
+SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
+SNAPSHOTS_DIR=$SCRIPT_DIR/snapshots
+ROOT_DIR=$(cd "$SCRIPT_DIR/.." && pwd)
+
+MODELS=(nanox nanosp stax flex apex_p)
+
+cd "$ROOT_DIR"
+
+echo "*** Removing old snapshots ***"
+rm -rf "$SNAPSHOTS_DIR"
+
+for model in "${MODELS[@]}"; do
+    if [[ "$model" == "nanosp" ]]; then
+        TARGET="nanosplus"
+    else
+        TARGET="$model"
+    fi
+
+    # Clean the build directory. Note that most of the time this is redundant, but after
+    # the app version has been bumped this is actually needed, otherwise the old version
+    # may be picked up from the existing artifacts of the sdk's build script.
+    echo "*** Cleaning the build directory for $model ***"
+    cargo clean --target "$TARGET"
+
+    echo "*** Building the app for $model ***"
+    cargo ledger build "$TARGET"
+
+    echo "*** Regenerating snapshots for $model ***"
+    pytest tests/ --tb=short -v --device "$model"  --golden_run
+done
diff --git a/tests/requirements.txt b/tests/requirements.txt
new file mode 100644
index 0000000..1c7e6e3
--- /dev/null
+++ b/tests/requirements.txt
@@ -0,0 +1,4 @@
+coincurve>=20.0.0
+pytest
+ragger[speculos,ledgerwallet]>=1.21.1
+scalecodec>=1.2.11
diff --git a/tests/setup.cfg b/tests/setup.cfg
new file mode 100644
index 0000000..7d0d7e3
--- /dev/null
+++ b/tests/setup.cfg
@@ -0,0 +1,21 @@
+[tool:pytest]
+addopts = --strict-markers
+
+[pylint]
+disable = C0114,  # missing-module-docstring
+          C0115,  # missing-class-docstring
+          C0116,  # missing-function-docstring
+          C0103,  # invalid-name
+          R0801,  # duplicate-code
+          R0913   # too-many-arguments
+max-line-length=100
+extension-pkg-whitelist=hid
+
+[pycodestyle]
+max-line-length = 100
+
+[mypy-hid.*]
+ignore_missing_imports = True
+
+[mypy-pytest.*]
+ignore_missing_imports = True
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diff --git a/tests/test_app_mainmenu.py b/tests/test_app_mainmenu.py
new file mode 100644
index 0000000..dfb9e71
--- /dev/null
+++ b/tests/test_app_mainmenu.py
@@ -0,0 +1,20 @@
+from ragger.navigator import NavInsID
+
+from utils import ROOT_SCREENSHOT_PATH
+
+
+# In this test we check the behavior of the device main menu
+def test_app_mainmenu(device, navigator, test_name):
+    # Navigate in the main menu
+    if device.is_nano:
+        instructions = [NavInsID.RIGHT_CLICK, NavInsID.RIGHT_CLICK]
+    else:
+        instructions = [
+            NavInsID.USE_CASE_HOME_SETTINGS,
+        ]
+    navigator.navigate_and_compare(
+        ROOT_SCREENSHOT_PATH,
+        test_name,
+        instructions,
+        screen_change_before_first_instruction=False,
+    )
diff --git a/tests/test_error_cmd.py b/tests/test_error_cmd.py
new file mode 100644
index 0000000..88c6b2b
--- /dev/null
+++ b/tests/test_error_cmd.py
@@ -0,0 +1,232 @@
+import pytest
+from ragger.error import ExceptionRAPDU
+
+from application_client import MAINNET
+from application_client.mintlayer_command_sender import (
+    CLA,
+    GetAppAndVersionP1,
+    SignTxP1,
+    P2,
+    Errors,
+    InsType,
+)
+from application_client.mintlayer_utils import (
+    sign_tx_start_req_obj,
+    sign_tx_next_req_obj,
+)
+
+
+# Ensure the app returns an error when a bad CLA is used
+def test_bad_cla(backend):
+    with pytest.raises(ExceptionRAPDU) as e:
+        backend.exchange(cla=CLA + 1, ins=InsType.GET_PUBLIC_KEY)
+    assert e.value.status == Errors.SW_CLA_NOT_SUPPORTED
+
+
+# Ensure the app returns an error when a bad INS is used
+def test_bad_ins(backend):
+    with pytest.raises(ExceptionRAPDU) as e:
+        backend.exchange(cla=CLA, ins=0xFF)
+    assert e.value.status == Errors.SW_INS_NOT_SUPPORTED
+
+
+# Ensure the app returns an error when a bad P1 or P2 is used
+def test_wrong_p1p2(backend):
+    # Wrong P2
+    with pytest.raises(ExceptionRAPDU) as e:
+        backend.exchange(
+            cla=CLA, ins=InsType.GET_PUBLIC_KEY, p1=GetAppAndVersionP1.P1_START, p2=123
+        )
+    assert e.value.status == Errors.SW_WRONG_P1P2
+
+    backend.exchange(
+        cla=CLA,
+        ins=InsType.GET_PUBLIC_KEY,
+        p1=GetAppAndVersionP1.P1_START,
+        p2=P2.P2_MORE,
+    )
+
+    # Wrong P1 after sending MORE
+    with pytest.raises(ExceptionRAPDU) as e:
+        backend.exchange(
+            cla=CLA,
+            ins=InsType.GET_PUBLIC_KEY,
+            p1=GetAppAndVersionP1.P1_START + 1,
+            p2=P2.P2_MORE,
+        )
+    assert e.value.status == Errors.SW_WRONG_P1P2
+
+
+# Ensure the app returns an error when a bad data length is used
+def test_wrong_data_length(backend):
+    # APDUs must be at least 4 bytes: CLA, INS, P1, P2.
+    with pytest.raises(ExceptionRAPDU) as e:
+        backend.exchange_raw(bytes.fromhex("E00300"))
+    assert e.value.status == Errors.SW_WRONG_APDU_LENGTH
+    # APDUs advertises a too long length
+    with pytest.raises(ExceptionRAPDU) as e:
+        backend.exchange_raw(bytes.fromhex("E003000005"))
+    assert e.value.status == Errors.SW_WRONG_APDU_LENGTH
+
+
+# Ensure there is no state confusion when trying wrong APDU sequences
+def test_invalid_state(backend):
+    with pytest.raises(ExceptionRAPDU) as e:
+        backend.exchange(
+            cla=CLA,
+            ins=InsType.SIGN_TX,
+            p1=SignTxP1.P1_NEXT,  # Try to continue a flow instead of start a new one
+            p2=P2.P2_LAST,
+        )
+    assert e.value.status == Errors.SW_WRONG_CONTEXT
+
+
+def test_sign_tx_invalid_coin(backend, scenario_navigator, device, navigator):
+    invalid_coin = 255
+    num_inputs = 1
+    num_outputs = 1
+    start_req = sign_tx_start_req_obj.encode(
+        {
+            "coin": invalid_coin,
+            "version": 0,
+            "num_inputs": num_inputs,
+            "num_outputs": num_outputs,
+        }
+    ).data
+
+    with pytest.raises(ExceptionRAPDU) as e:
+        res = backend.exchange(
+            cla=CLA,
+            ins=InsType.SIGN_TX,
+            p1=SignTxP1.P1_START,
+            p2=P2.P2_LAST,
+            data=bytes(start_req),
+        )
+
+    assert e.value.status == Errors.SW_DESERIALIZE_FAIL
+
+
+def test_sign_tx_invalid_context(backend, scenario_navigator, device, navigator):
+    """
+    After the start request try to pass an output instead of the input
+    expect an error for wrong context
+    """
+    num_inputs = 2
+    num_outputs = 2
+    start_req = sign_tx_start_req_obj.encode(
+        {
+            "coin": MAINNET,
+            "version": 0,
+            "num_inputs": num_inputs,
+            "num_outputs": num_outputs,
+        }
+    ).data
+
+    res = backend.exchange(
+        cla=CLA,
+        ins=InsType.SIGN_TX,
+        p1=SignTxP1.P1_START,
+        p2=P2.P2_LAST,
+        data=bytes(start_req),
+    )
+
+    assert res.status == 0x9000
+
+    with pytest.raises(ExceptionRAPDU) as e:
+        res = backend.exchange(
+            cla=CLA,
+            ins=InsType.SIGN_TX,
+            p1=SignTxP1.P1_NEXT,
+            p2=P2.P2_LAST,
+            data=sign_tx_next_req_obj.encode(
+                {
+                    "ProcessOutput": {
+                        "output": {
+                            "Transfer": [
+                                {"Coin": 10},
+                                {
+                                    "PublicKey": {
+                                        "key": {
+                                            "Secp256k1Schnorr": {
+                                                "pubkey_data": bytes([0] * 33)
+                                            }
+                                        }
+                                    }
+                                },
+                            ],
+                        }
+                    }
+                }
+            ).data,
+        )
+    assert e.value.status == Errors.SW_WRONG_CONTEXT
+
+
+def test_sign_tx_invalid_input(backend, scenario_navigator, device, navigator):
+    num_inputs = 2
+    num_outputs = 2
+    start_req = sign_tx_start_req_obj.encode(
+        {
+            "coin": MAINNET,
+            "version": 0,
+            "num_inputs": num_inputs,
+            "num_outputs": num_outputs,
+        }
+    ).data
+
+    res = backend.exchange(
+        cla=CLA,
+        ins=InsType.SIGN_TX,
+        p1=SignTxP1.P1_START,
+        p2=P2.P2_LAST,
+        data=bytes(start_req),
+    )
+
+    print("res, ", res.status)
+    assert res.status == 0x9000
+
+    with pytest.raises(ExceptionRAPDU) as e:
+        res = backend.exchange(
+            cla=CLA,
+            ins=InsType.SIGN_TX,
+            p1=SignTxP1.P1_NEXT,
+            p2=P2.P2_LAST,
+            data=bytes([0] * 10),
+        )
+
+    assert e.value.status == Errors.SW_DESERIALIZE_FAIL
+
+
+def test_sign_tx_too_large_data(backend, scenario_navigator, device, navigator):
+    num_inputs = 2
+    num_outputs = 2
+    start_req = sign_tx_start_req_obj.encode(
+        {
+            "coin": MAINNET,
+            "version": 0,
+            "num_inputs": num_inputs,
+            "num_outputs": num_outputs,
+        }
+    ).data
+
+    res = backend.exchange(
+        cla=CLA,
+        ins=InsType.SIGN_TX,
+        p1=SignTxP1.P1_START,
+        p2=P2.P2_LAST,
+        data=bytes(start_req),
+    )
+
+    assert res.status == 0x9000
+
+    with pytest.raises(ExceptionRAPDU) as e:
+        for _ in range(1000):
+            res = backend.exchange(
+                cla=CLA,
+                ins=InsType.SIGN_TX,
+                p1=SignTxP1.P1_NEXT,
+                p2=P2.P2_MORE,
+                data=b"input_data",
+            )
+
+    assert e.value.status == Errors.SW_MAX_BUFFER_LEN_EXCEEDED
diff --git a/tests/test_name_version.py b/tests/test_name_version.py
new file mode 100644
index 0000000..f326ff7
--- /dev/null
+++ b/tests/test_name_version.py
@@ -0,0 +1,17 @@
+from application_client.mintlayer_command_sender import MintlayerCommandSender
+from application_client.mintlayer_response_unpacker import (
+    unpack_get_app_and_version_response,
+)
+
+
+# Test a specific APDU asking BOLOS (and not the app) the name and version of the current app
+def test_get_app_and_version(backend, backend_name):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    # Send the special instruction to BOLOS
+    response = client.get_app_and_version()
+    # Use an helper to parse the response, assert the values
+    app_name, version = unpack_get_app_and_version_response(response.data)
+    print(app_name, version)
+    assert app_name == "Mintlayer"
+    assert version == "1.0.0"
diff --git a/tests/test_pubkey_cmd.py b/tests/test_pubkey_cmd.py
new file mode 100644
index 0000000..8f3ef23
--- /dev/null
+++ b/tests/test_pubkey_cmd.py
@@ -0,0 +1,79 @@
+import pytest
+from ragger.bip import CurveChoice, calculate_public_key_and_chaincode
+from ragger.error import ExceptionRAPDU
+
+from application_client import MAINNET, TESTNET
+from application_client.mintlayer_command_sender import Errors, MintlayerCommandSender
+from application_client.mintlayer_response_unpacker import (
+    unpack_get_public_key_response,
+)
+
+MNEMONIC = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"
+
+
+# In this test we check that the GET_PUBLIC_KEY works in non-confirmation mode
+def test_get_public_key_no_confirm(backend):
+    for path in [
+        "m/44'/19788'/0'/0/0",
+        "m/44'/19788'/0/0/0",
+        "m/44'/19788'/911'/0/0",
+        "m/44'/19788'/255/255/255",
+        "m/44'/19788'/2147483647/0/0/0/0/0/0/0",
+    ]:
+        client = MintlayerCommandSender(backend)
+        response = client.get_public_key(coin=MAINNET, path=path).data
+        _, public_key, _, _ = unpack_get_public_key_response(response)
+
+        ref_public_key, _ = calculate_public_key_and_chaincode(
+            CurveChoice.Secp256k1, path=path, mnemonic=MNEMONIC
+        )
+        assert public_key.hex() == ref_public_key
+
+
+def test_get_public_key_no_confirm_testnet(backend):
+    for path in [
+        "m/44'/1'/0'/0/0",
+        "m/44'/1'/0/0/0",
+        "m/44'/1'/911'/0/0",
+        "m/44'/1'/255/255/255",
+        "m/44'/1'/2147483647/0/0/0/0/0/0/0",
+    ]:
+        client = MintlayerCommandSender(backend)
+        response = client.get_public_key(coin=TESTNET, path=path).data
+        _, public_key, _, _ = unpack_get_public_key_response(response)
+
+        ref_public_key, _ = calculate_public_key_and_chaincode(
+            CurveChoice.Secp256k1, path=path, mnemonic=MNEMONIC
+        )
+        assert public_key.hex() == ref_public_key
+
+
+# In this test we check that the GET_PUBLIC_KEY works in confirmation mode
+def test_get_public_key_confirm_accepted(backend, scenario_navigator):
+    client = MintlayerCommandSender(backend)
+    path = "m/44'/19788'/0'/0/0"
+
+    with client.get_public_key_with_confirmation(coin=MAINNET, path=path):
+        scenario_navigator.address_review_approve()
+
+    response = client.get_async_response().data
+    _, public_key, _, _ = unpack_get_public_key_response(response)
+
+    ref_public_key, _ = calculate_public_key_and_chaincode(
+        CurveChoice.Secp256k1, path=path, mnemonic=MNEMONIC
+    )
+    assert public_key.hex() == ref_public_key
+
+
+# In this test we check that the GET_PUBLIC_KEY in confirmation mode replies an error if the user refuses
+def test_get_public_key_confirm_refused(backend, scenario_navigator):
+    client = MintlayerCommandSender(backend)
+    path = "m/44'/19788'/0'/0/0"
+
+    with pytest.raises(ExceptionRAPDU) as e:
+        with client.get_public_key_with_confirmation(coin=MAINNET, path=path):
+            scenario_navigator.address_review_reject()
+
+    # Assert that we have received a refusal
+    assert e.value.status == Errors.SW_DENY
+    assert len(e.value.data) == 0
diff --git a/tests/test_sign_message.py b/tests/test_sign_message.py
new file mode 100644
index 0000000..b7b7dd0
--- /dev/null
+++ b/tests/test_sign_message.py
@@ -0,0 +1,90 @@
+import pytest
+from ragger.error import ExceptionRAPDU
+
+from application_client import MAINNET
+from application_client.mintlayer_command_sender import Errors, MintlayerCommandSender
+from application_client.mintlayer_response_unpacker import (
+    unpack_sign_message_response,
+    unpack_get_public_key_response,
+)
+from application_client.mintlayer_utils import (
+    verify_message_signature,
+)
+
+
+# In this test we check that the message signing works
+def test_sign_message(backend, scenario_navigator):
+    path = "m/44'/19788'/0'/0/0"
+    message = b"Hello"
+    coin = MAINNET
+    client = MintlayerCommandSender(backend)
+
+    pubkey = get_pub_key(client, coin=coin, path=path)
+
+    with client.sign_message(coin=coin, addr_type=0, path=path, message=message):
+        scenario_navigator.review_approve()
+
+    sig = unpack_sign_message_response(client.get_async_response().data)
+
+    sig_valid = verify_message_signature(message, pubkey, sig)
+    assert sig_valid, "Signature verification failed"
+
+
+# Same as test_sign_message, but the message is large enough to require chunking
+def test_sign_large_message(backend, scenario_navigator):
+    path = "m/44'/19788'/0'/0/0"
+    message = b"Hello" * 100
+    coin = MAINNET
+    client = MintlayerCommandSender(backend)
+
+    pubkey = get_pub_key(client, coin=coin, path=path)
+
+    with client.sign_message(coin=coin, addr_type=0, path=path, message=message):
+        scenario_navigator.review_approve()
+
+    sig = unpack_sign_message_response(client.get_async_response().data)
+    assert len(sig) == 64
+
+    sig_valid = verify_message_signature(message, pubkey, sig)
+    assert sig_valid, "Signature verification failed"
+
+
+def test_sign_message_pkh(backend, scenario_navigator):
+    path = "m/44'/19788'/0'/0/0"
+    message = b"Hello"
+    coin = MAINNET
+    client = MintlayerCommandSender(backend)
+
+    pubkey = get_pub_key(client, coin=coin, path=path)
+
+    with client.sign_message(coin=coin, addr_type=1, path=path, message=message):
+        scenario_navigator.review_approve()
+
+    sig = unpack_sign_message_response(client.get_async_response().data)
+
+    sig_valid = verify_message_signature(message, pubkey, sig)
+    assert sig_valid, "Signature verification failed"
+
+
+# Message signing refused test
+# The test will ask for a message signature that will be refused on screen
+def test_sign_message_refused(backend, scenario_navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    path: str = "m/44'/19788'/0'/0/0"
+    message: bytes = b"Hello"
+    coin = MAINNET
+
+    with pytest.raises(ExceptionRAPDU) as e:
+        with client.sign_message(coin=coin, addr_type=0, path=path, message=message):
+            scenario_navigator.review_reject()
+
+    # Assert that we have received a refusal
+    assert e.value.status == Errors.SW_DENY
+    assert len(e.value.data) == 0
+
+
+def get_pub_key(client: MintlayerCommandSender, coin: int, path: str) -> bytes:
+    rapdu = client.get_public_key(coin, path)
+    _, pubkey, _, _ = unpack_get_public_key_response(rapdu.data)
+    return pubkey
diff --git a/tests/test_sign_tx.py b/tests/test_sign_tx.py
new file mode 100644
index 0000000..029ba00
--- /dev/null
+++ b/tests/test_sign_tx.py
@@ -0,0 +1,1591 @@
+from application_client import MAINNET
+from application_client.mintlayer_command_sender import (
+    MintlayerCommandSender,
+    sign_tx_review,
+    ReviewTransaction,
+)
+from application_client.mintlayer_response_unpacker import (
+    unpack_get_public_key_response,
+)
+from application_client.mintlayer_utils import Transaction, sign_tx_next_req_obj
+
+# TODO: implement missing tests:
+# * CreateOrder, DataDeposit, Burn outputs;
+# * pool decommissioning;
+# * LockTokenSupply, FreezeOrder commands;
+# * maybe something else.
+# See https://github.com/mintlayer/mintlayer-ledger-app/issues/19.
+
+
+def test_sign_tx_transfer(backend, scenario_navigator, device, navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    # The path used for this entire test
+    path: str = "m/44'/19788'/0'/0/0"
+
+    # First we need to get the public key of the device in order to build the transaction
+    rapdu = client.get_public_key(coin=MAINNET, path=path)
+    _, public_key, _, _ = unpack_get_public_key_response(rapdu.data)
+
+    print("pk", len(public_key))
+
+    h = 1 << 31
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 10},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([0] * 32)},
+                    "index": 1,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 10},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\stransfer",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_lock_then_transfer(backend, scenario_navigator, device, navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    # The path used for this entire test
+    path: str = "m/44'/19788'/0'/0/0"
+
+    h = 1 << 31
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Account": {
+                "nonce": 1,
+                "spending": {"DelegationBalance": [[0] * 32, 11]},
+            }
+        },
+    }
+
+    inp_commitment = {"commitment": {"None": None}}
+
+    output = {
+        "output": {
+            "LockThenTransfer": [
+                {"Coin": 10},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+                {"UntilHeight": 10},
+            ],
+        }
+    }
+
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\sdelegation",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_create_delegation(backend, scenario_navigator, device, navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 10},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([0] * 32)},
+                    "index": 1,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    output = {
+        "output": {
+            "CreateDelegationId": [
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+                [0] * 32,
+            ],
+        }
+    }
+
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\screate",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_delegate_staking(backend, scenario_navigator, device, navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 10},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([0] * 32)},
+                    "index": 1,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    output = {
+        "output": {
+            "DelegateStaking": [5, [0] * 32],
+        }
+    }
+
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\sdelegate",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_create_stake_pool(backend, scenario_navigator, device, navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 40001},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([0] * 32)},
+                    "index": 1,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    output = {
+        "output": {
+            "CreateStakePool": [
+                [0] * 32,
+                {
+                    "pledge": 40000,
+                    "staker": {
+                        "PublicKey": {
+                            "key": {
+                                "Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}
+                            }
+                        }
+                    },
+                    "vrf_public_key": {"key": {"Schnorrkel": {"key": bytes([0] * 32)}}},
+                    "decommission_key": {
+                        "PublicKey": {
+                            "key": {
+                                "Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}
+                            }
+                        }
+                    },
+                    "margin_ratio_per_thousand": 10,
+                    "cost_per_block": 5,
+                },
+            ],
+        }
+    }
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\screate\sstake",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_issue_fungible_token(backend, scenario_navigator, device, navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 10},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([0] * 32)},
+                    "index": 1,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    output = {
+        "output": {
+            "IssueFungibleToken": {
+                "V1": {
+                    "token_ticker": b"MYTKN",
+                    "number_of_decimals": 8,
+                    "metadata_uri": b"https://my.token.uri",
+                    "total_supply": {"Fixed": 1000000000},
+                    "authority": {
+                        "PublicKey": {
+                            "key": {
+                                "Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}
+                            }
+                        }
+                    },
+                    "is_freezable": {"Yes": None},
+                }
+            },
+        }
+    }
+
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\screate\stoken",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_issue_nft(backend, scenario_navigator, device, navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 2000},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([0] * 32)},
+                    "index": 1,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    # This is the new output for issuing an NFT.
+    # The structure is (TokenId, NftIssuance, Destination)
+    output = {
+        "output": {
+            "IssueNft": [
+                bytes([0] * 32),
+                {
+                    "V0": {
+                        "metadata": {
+                            "creator": {
+                                "public_key": {
+                                    "key": {
+                                        "Secp256k1Schnorr": {
+                                            "pubkey_data": bytes([0] * 33)
+                                        }
+                                    }
+                                }
+                            },
+                            "name": b"MyAwesomeNFT",
+                            "description": b"FirstNFT",
+                            "ticker": b"MNFT1",
+                            "icon_uri": b"https://my.nft/icon.png",
+                            "additional_metadata_uri": b"https://my.nft/meta.json",
+                            "media_uri": b"https://my.nft/media.jpg",
+                            "media_hash": bytes([0] * 32),
+                        }
+                    }
+                },
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\screate\sNFT",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_mint_tokens(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with two inputs:
+    1. A standard UTXO input.
+    2. An AccountCommand input to mint new tokens.
+    And one output to transfer the newly minted tokens.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The utxo (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    account_nonce = 1
+    token_id = bytes([0] * 32)
+    account_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "AccountCommand": [
+                account_nonce,
+                {
+                    "MintTokens": [
+                        token_id,
+                        1000,  # Amount to mint
+                    ]
+                },
+            ]
+        },
+    }
+
+    acc_inp_commitment = {"commitment": {"None": None}}
+
+    mint_output = {
+        "output": {
+            "Transfer": [
+                {"TokenV1": [token_id, 1000]},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input],
+        input_commitments=[inp_commitment, acc_inp_commitment],
+        outputs=[mint_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\smint\stokens",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_unmint_tokens(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with two inputs:
+    1. A standard UTXO input to pay tx fees.
+    2. An AccountCommand input to unmint new tokens.
+    3. A standard UTXO input with tokens to unmint
+    And one output to transfer the newly minted tokens.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional data (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    additional_info2 = {
+        "Utxo": {
+            "Transfer": [
+                {"TokenV1": [bytes([0] * 32), 1000]},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    utxo_input2 = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 2,
+                },
+                additional_info2,
+            ]
+        },
+    }
+
+    inp_commitment2 = {"commitment": additional_info2}
+
+    account_nonce = 1
+    token_id = bytes([0] * 32)
+    account_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "AccountCommand": [
+                account_nonce,
+                {
+                    "UnmintTokens": token_id,
+                },
+            ]
+        },
+    }
+
+    acc_inp_commitment = {"commitment": {"None": None}}
+
+    change_output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 99},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input, utxo_input2],
+        input_commitments=[inp_commitment, acc_inp_commitment, inp_commitment2],
+        outputs=[change_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\sunmint\stokens",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_freeze_tokens(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with two inputs:
+    1. A standard UTXO input to pay for tx fees.
+    2. An AccountCommand input to freeze the tokens.
+    And one output to transfer the change coins.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional info (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    account_nonce = 1
+    token_id = bytes([0] * 32)
+    account_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "AccountCommand": [
+                account_nonce,
+                {"FreezeToken": [token_id, {"No": None}]},
+            ]
+        },
+    }
+
+    acc_inp_commitment = {"commitment": {"None": None}}
+
+    change_output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 99},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input],
+        input_commitments=[inp_commitment, acc_inp_commitment],
+        outputs=[change_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\sfreeze\stokens",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_unfreeze_tokens(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with two inputs:
+    1. A standard UTXO input to pay for tx fees.
+    2. An AccountCommand input to unfreeze the tokens.
+    And one output to transfer the change coins.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional data (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    account_nonce = 1
+    token_id = bytes([0] * 32)
+    account_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "AccountCommand": [
+                account_nonce,
+                {
+                    "UnfreezeToken": token_id,
+                },
+            ]
+        },
+    }
+
+    acc_inp_commitment = {"commitment": {"None": None}}
+
+    change_output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 99},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input],
+        input_commitments=[inp_commitment, acc_inp_commitment],
+        outputs=[change_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\sunfreeze",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_change_token_authority(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with two inputs:
+    1. A standard UTXO input to pay for tx fees.
+    2. An AccountCommand input to change the token's authority.
+    And one output to transfer the change coins.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional data (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    account_nonce = 1
+    token_id = bytes([0] * 32)
+    account_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "AccountCommand": [
+                account_nonce,
+                {
+                    "ChangeTokenAuthority": [
+                        token_id,
+                        {
+                            "PublicKey": {
+                                "key": {
+                                    "Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}
+                                }
+                            }
+                        },
+                    ]
+                },
+            ]
+        },
+    }
+
+    acc_inp_commitment = {"commitment": {"None": None}}
+
+    change_output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 99},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input],
+        input_commitments=[inp_commitment, acc_inp_commitment],
+        outputs=[change_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\schange\stoken",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_change_token_metadata_uri(
+    backend, scenario_navigator, device, navigator
+):
+    """
+    Test signing a transaction with two inputs:
+    1. A standard UTXO input to pay for tx fees.
+    2. An AccountCommand input to change the token's metadata uri.
+    And one output to transfer the change coins.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional info (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    account_nonce = 1
+    token_id = bytes([0] * 32)
+    account_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "AccountCommand": [
+                account_nonce,
+                {
+                    "ChangeTokenMetadataUri": [
+                        token_id,
+                        "uri.com".encode(),
+                    ]
+                },
+            ]
+        },
+    }
+
+    acc_inp_commitment = {"commitment": {"None": None}}
+
+    change_output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 99},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input],
+        input_commitments=[inp_commitment, acc_inp_commitment],
+        outputs=[change_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\schange\stoken",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_order_fill(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with 3 inputs:
+    1. A standard UTXO input to pay for tx fees.
+    2. An account command input to fill an order.
+    3. A standard UTXO input to be used for the fill.
+    And one output to transfer the change coins.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional info (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    fill_amount = 10
+    fill_ask = 100
+    fill_give = 1000
+
+    additional_order_info = {
+        "initially_asked": {"Coin": fill_ask},
+        "initially_given": {"TokenV1": [bytes([0] * 32), fill_give]},
+        "ask_balance": 0,
+        "give_balance": 0,
+    }
+    order_id = bytes([0] * 32)
+    account_input = {
+        "addresses": [],  # FillOrder input must not be signed
+        "input": {
+            "OrderAccountCommand": [
+                {
+                    "FillOrder": [
+                        order_id,
+                        fill_amount,
+                    ]
+                },
+                additional_order_info,
+            ]
+        },
+    }
+
+    fill_order_inp_commitment = {
+        "commitment": {
+            "FillOrderAccountCommand": [
+                additional_order_info["initially_asked"],
+                additional_order_info["initially_given"],
+            ]
+        },
+    }
+
+    change_output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 100 - 1 - fill_amount},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    fill_output = {
+        "output": {
+            "Transfer": [
+                {
+                    "TokenV1": [
+                        bytes([0] * 32),
+                        fill_amount * fill_give // fill_ask,
+                    ]
+                },
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input],
+        input_commitments=[inp_commitment, fill_order_inp_commitment],
+        outputs=[change_output, fill_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\sfill\sorder",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_order_conclude(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with two inputs:
+    1. A standard UTXO input to pay for tx fees.
+    2. An OrderAccountCommand input to conclude an order.
+    And one output to transfer the change coins + ask balance and another output for the give balance.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional_data (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    initial_ask = 100
+    initial_give = 1000
+    ask_balance = 10
+    give_balance = 900
+
+    token_id = bytes([1] * 32)
+    additional_order_info = {
+        "initially_asked": {"Coin": initial_ask},
+        "initially_given": {"TokenV1": [token_id, initial_give]},
+        "ask_balance": ask_balance,
+        "give_balance": give_balance,
+    }
+    order_id = bytes([1] * 32)
+    account_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "OrderAccountCommand": [
+                {
+                    "ConcludeOrder": order_id,
+                },
+                additional_order_info,
+            ]
+        },
+    }
+
+    conclude_order_inp_commitment = {
+        "commitment": {
+            "ConcludeOrderAccountCommand": [
+                additional_order_info["initially_asked"],
+                additional_order_info["initially_given"],
+                additional_order_info["ask_balance"],
+                additional_order_info["give_balance"],
+            ]
+        },
+    }
+
+    change_output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 100 - 1 + ask_balance},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    conclude_output = {
+        "output": {
+            "Transfer": [
+                {"TokenV1": [token_id, give_balance]},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input],
+        input_commitments=[inp_commitment, conclude_order_inp_commitment],
+        outputs=[change_output, conclude_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\sconclude\sorder",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_htlc(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with one input:
+    1. The standard UTXO input to pay for tx fees.
+    And one output to transfer the change coins and the HTLC output.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional info (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    change_output = {
+        "output": {
+            "Transfer": [
+                {"Coin": 89},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    htlc_output = {
+        "output": {
+            "Htlc": [
+                {"Coin": 10},
+                {
+                    "secret_hash": [0] * 20,
+                    "spend_key": {
+                        "PublicKey": {
+                            "key": {
+                                "Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}
+                            }
+                        }
+                    },
+                    "refund_timelock": {"UntilHeight": 100},
+                    "refund_key": {
+                        "PublicKey": {
+                            "key": {
+                                "Secp256k1Schnorr": {"pubkey_data": bytes([3] * 33)}
+                            }
+                        }
+                    },
+                },
+            ],
+        }
+    }
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input],
+        input_commitments=[inp_commitment],
+        outputs=[htlc_output, change_output],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\screate\sHTLC",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+def test_sign_tx_without_outputs(backend, scenario_navigator, device, navigator):
+    """
+    Test signing a transaction with two inputs:
+    1. A standard UTXO input to pay for tx fees.
+    2. An AccountCommand input to freeze the tokens.
+    And no outputs.
+    """
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    bip44_path = [44 + h, 19788 + h, 0 + h, 0, 0]
+
+    # The additional info (the previous TxOutput that this UTXO input spends)
+    # This represents an output of 100 coins owned by our key
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 100},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    utxo_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([1] * 32)},
+                    "index": 0,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    account_nonce = 1
+    token_id = bytes([0] * 32)
+    account_input = {
+        "addresses": [{"path": bip44_path, "multisig_idx": None}],
+        "input": {
+            "AccountCommand": [
+                account_nonce,
+                {"FreezeToken": [token_id, {"No": None}]},
+            ]
+        },
+    }
+
+    acc_inp_commitment = {"commitment": {"None": None}}
+
+    transaction = Transaction(
+        coin=MAINNET,
+        inputs=[utxo_input, account_input],
+        input_commitments=[inp_commitment, acc_inp_commitment],
+        outputs=[],
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=True,
+        review_custom_screen_text=r"Sign\sfreeze\stokens",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+# Sign a tx with an output large enough to require chunking
+def test_sign_tx_with_large_output(backend, scenario_navigator, device, navigator):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+    additional_info = {
+        "Utxo": {
+            "Transfer": [
+                {"Coin": 2000},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([0] * 32)},
+                    "index": 1,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    # Make the output big
+    metadata_uri = b"abcef" * 100
+
+    # This is an output for issuing an NFT.
+    # The structure is (TokenId, NftIssuance, Destination)
+    output = {
+        "output": {
+            "IssueNft": [
+                bytes([0] * 32),
+                {
+                    "V0": {
+                        "metadata": {
+                            "creator": {
+                                "public_key": {
+                                    "key": {
+                                        "Secp256k1Schnorr": {
+                                            "pubkey_data": bytes([0] * 33)
+                                        }
+                                    }
+                                }
+                            },
+                            "name": b"MyAwesomeNFT",
+                            "description": b"FirstNFT",
+                            "ticker": b"MNFT1",
+                            "icon_uri": b"https://my.nft/icon.png",
+                            "additional_metadata_uri": metadata_uri,
+                            "media_uri": b"https://my.nft/media.jpg",
+                            "media_hash": bytes([0] * 32),
+                        }
+                    }
+                },
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    # Sanity check
+    assert len(sign_tx_next_req_obj.encode({"ProcessOutput": output}).data) > 500
+
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\screate\sNFT",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
+
+
+# Sign a tx with an input and input commitment large enough to require chunking
+def test_sign_tx_with_large_input_and_commitment(
+    backend, scenario_navigator, device, navigator
+):
+    # Use the app interface instead of raw interface
+    client = MintlayerCommandSender(backend)
+    h = 1 << 31
+
+    # Make the additional info big
+    metadata_uri = b"abcef" * 100
+
+    # The utxo is for issuing an NFT.
+    # The structure is (TokenId, NftIssuance, Destination)
+    token_id = bytes([11] * 32)
+    additional_info = {
+        "Utxo": {
+            "IssueNft": [
+                token_id,
+                {
+                    "V0": {
+                        "metadata": {
+                            "creator": {
+                                "public_key": {
+                                    "key": {
+                                        "Secp256k1Schnorr": {
+                                            "pubkey_data": bytes([0] * 33)
+                                        }
+                                    }
+                                }
+                            },
+                            "name": b"MyAwesomeNFT",
+                            "description": b"FirstNFT",
+                            "ticker": b"MNFT1",
+                            "icon_uri": b"https://my.nft/icon.png",
+                            "additional_metadata_uri": metadata_uri,
+                            "media_uri": b"https://my.nft/media.jpg",
+                            "media_hash": bytes([0] * 32),
+                        }
+                    }
+                },
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([0] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+    inp = {
+        "addresses": [{"path": [44 + h, 19788 + h, 0 + h, 0, 0], "multisig_idx": None}],
+        "input": {
+            "Utxo": [
+                {
+                    "id": {"Transaction": bytes([0] * 32)},
+                    "index": 1,
+                },
+                additional_info,
+            ]
+        },
+    }
+
+    inp_commitment = {"commitment": additional_info}
+
+    output = {
+        "output": {
+            "Transfer": [
+                {"TokenV1": [token_id, 1]},
+                {
+                    "PublicKey": {
+                        "key": {"Secp256k1Schnorr": {"pubkey_data": bytes([2] * 33)}}
+                    }
+                },
+            ],
+        }
+    }
+
+    # Sanity checks
+    assert len(sign_tx_next_req_obj.encode({"ProcessInput": inp}).data) > 500
+    assert (
+        len(
+            sign_tx_next_req_obj.encode({"ProcessInputCommitment": inp_commitment}).data
+        )
+        > 500
+    )
+
+    # Create the transaction that will be sent to the device for signing
+    transaction = Transaction(
+        coin=MAINNET, inputs=[inp], input_commitments=[inp_commitment], outputs=[output]
+    )
+
+    review_tx = ReviewTransaction(
+        transaction=transaction,
+        has_command_input=False,
+        review_custom_screen_text=r"Sign\stransfer",
+    )
+    sign_tx_review(client, device, navigator, scenario_navigator, review_tx)
diff --git a/tests/usage.md b/tests/usage.md
new file mode 100644
index 0000000..fcde929
--- /dev/null
+++ b/tests/usage.md
@@ -0,0 +1,91 @@
+# How to use the Ragger test framework
+
+This document describes how to run the Mintlayer Ledger app functional tests with the Ragger test
+framework, either on the Speculos emulator or on a physical Ledger device.
+
+## Quickly get started with Ragger and Speculos
+
+### Install Ragger and dependencies
+
+In this document we'll be running tests outside of a Docker container, in which case additional
+dependencies must be installed:
+
+```bash
+pip install -r tests/requirements.txt
+sudo apt-get update && sudo apt-get install qemu-user-static
+```
+
+### Build the application
+
+Build the app for the device model that will be used by the tests; you can use the image
+`ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder` for this:
+
+```bash
+docker pull ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest
+docker run --user "$(id -u)":"$(id -g)" --rm -ti -v "$(realpath .):/app" -w /app ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest
+```
+
+Then, inside the container:
+
+```bash
+cargo ledger build nanox
+```
+
+ℹ️ `cargo ledger build` accepts `nanox`, `nanosplus`, `stax`, `flex`, and `apex_p`.
+
+ℹ️ Alternatively, the `ledger-app-dev-tools` image can be used. It already contains tools required to run tests
+and must be used if you intend to run them inside the Docker container.
+
+### Run tests using the Speculos emulator
+
+Run the functional tests from the repository root:
+
+```bash
+pytest tests/ --tb=short -v --device nanox
+```
+
+To see the emulator display while tests run, add `--display`:
+
+```bash
+pytest tests/ --tb=short -v --device nanox --display
+```
+
+⚠️ `--device` specifies the Speculos device model and it should match the binary you've built.
+Normally, it will be the same as the `cargo` target that you've passed to `cargo ledger build`,
+except for `nanosplus`, whose corresponding device model name is `nanosp`.
+
+### Run tests using a physical Ledger device
+
+The Mintlayer app must be built, loaded on the device, and opened before running the tests.
+See [Loading on device](../README.md#loading-on-device) for platform-specific loading instructions.
+
+After the app has been installed on the device, run the tests via:
+```bash
+pytest tests/ --tb=short -v --device nanox --backend ledgerwallet
+```
+
+⚠️ Functional tests expect the device to be seeded with the seed phrase "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about".
+If this is not the case, most of the tests will fail.
+
+## Available pytest options
+
+Standard useful pytest options:
+
+```text
+    -v              formats the test summary in a readable way;
+    -s              enables logs for successful tests; on Speculos it enables app logs if compiled with DEBUG=1;
+    -k <expression> only runs the tests which match <expression>; the expression may be a single substring to match
+                    against test names and their parent classes, or a combination of them, e.g. '-k foo' or
+                    '-k "(foo or bar) and not baz"';
+    --tb=short      formats tracebacks in a compact way;
+```
+
+Custom pytest options:
+
+```text
+    --device <device>           run tests on the specified device [nanox,nanosp,stax,flex,apex_p,all];
+    --backend <backend>         run tests against [speculos, ledgercomm, ledgerwallet]; Speculos is the default;
+    --display                   on Speculos, show the app screen using QT;
+    --golden_run                save current screens instead of comparing them;
+    --log_apdu_file <filepath>  log all APDU exchanges to the given file; previous file content is erased;
+```
diff --git a/tests/utils.py b/tests/utils.py
new file mode 100644
index 0000000..1d79e50
--- /dev/null
+++ b/tests/utils.py
@@ -0,0 +1,3 @@
+from pathlib import Path
+
+ROOT_SCREENSHOT_PATH = Path(__file__).parent.resolve()
diff --git a/tools/codecheck.py b/tools/codecheck.py
new file mode 100755
index 0000000..847d8ed
--- /dev/null
+++ b/tools/codecheck.py
@@ -0,0 +1,191 @@
+#!/usr/bin/env python3
+
+import itertools
+import os
+import pathlib
+import re
+import sys
+
+PROJECT_ROOT_DIR = pathlib.Path(__file__).resolve().parent.parent
+
+LICENSE_TEMPLATE1 = [
+    r"/\*{77}",
+    r" \*   Mintlayer Ledger App\.",
+    r" \*   \(c\) 202[0-9](-202[0-9])? RBB S\.r\.l\.",
+    r" \*",
+    r' \*  Licensed under the Apache License, Version 2\.0 \(the "License"\);',
+    r" \*  you may not use this file except in compliance with the License\.",
+    r" \*  You may obtain a copy of the License at",
+    r" \*",
+    r" \*      http://www\.apache\.org/licenses/LICENSE-2\.0",
+    r" \*",
+    r" \*  Unless required by applicable law or agreed to in writing, software",
+    r' \*  distributed under the License is distributed on an "AS IS" BASIS,',
+    r" \*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.",
+    r" \*  See the License for the specific language governing permissions and",
+    r" \*  limitations under the License\.",
+    r" \*{77}/",
+]
+
+LICENSE_TEMPLATE2 = [
+    r"/\*{77}",
+    r" \*   Mintlayer Ledger App\.",
+    r" \*   \(c\) 202[0-9](-202[0-9])? Ledger SAS\.",
+    r" \*   \(c\) 202[0-9](-202[0-9])? RBB S\.r\.l\.",
+    r" \*",
+    r' \*  Licensed under the Apache License, Version 2\.0 \(the "License"\);',
+    r" \*  you may not use this file except in compliance with the License\.",
+    r" \*  You may obtain a copy of the License at",
+    r" \*",
+    r" \*      http://www\.apache\.org/licenses/LICENSE-2\.0",
+    r" \*",
+    r" \*  Unless required by applicable law or agreed to in writing, software",
+    r' \*  distributed under the License is distributed on an "AS IS" BASIS,',
+    r" \*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.",
+    r" \*  See the License for the specific language governing permissions and",
+    r" \*  limitations under the License\.",
+    r" \*{77}/",
+]
+
+COMMON_EXCLUDE_DIRS = ["target", ".git", ".mypy_cache"]
+
+
+# List source files with the given extension. If the extension is None, list all files.
+def sources_with_extension(ext: str | None, top_dir=".", exclude=[]):
+    exclude_full_paths = [
+        os.path.normpath(rel_path) for rel_path in COMMON_EXCLUDE_DIRS + exclude
+    ]
+    exclude_names = ["__pycache__"]
+
+    def is_excluded(dirpath, entry_name):
+        return (
+            entry_name in exclude_names
+            or os.path.normpath(os.path.join(dirpath, entry_name).lower())
+            in exclude_full_paths
+        )
+
+    for dirpath, dirnames, filenames in os.walk(top_dir, topdown=True):
+        dirnames[:] = [d for d in dirnames if not is_excluded(dirpath, d)]
+        for filename in filenames:
+            if not is_excluded(dirpath, filename):
+                if ext is None or os.path.splitext(filename)[1].lower() == ext:
+                    yield os.path.join(dirpath, filename)
+
+
+# List all files
+def all_files(exclude=[]):
+    return sources_with_extension(None, exclude=exclude)
+
+
+# List Rust source files
+def rs_sources(exclude=[]):
+    return sources_with_extension(".rs", exclude=exclude)
+
+
+# List Cargo config files
+def cargo_config_files(exclude=[]):
+    return sources_with_extension(".toml", exclude=exclude)
+
+
+# List Python source files
+def py_sources(exclude=[]):
+    return sources_with_extension(".py", exclude=exclude)
+
+
+# List GitHub workflow files
+def github_workflows(exclude=[]):
+    return sources_with_extension(".yml", top_dir=".github", exclude=exclude)
+
+
+# Check license header in Rust source files
+def check_local_licenses():
+    print("==== Checking local license headers:")
+
+    # List of files/dirs excluded from the check
+    exclude = []
+
+    template1 = re.compile("(?:" + r")\n(?:".join(LICENSE_TEMPLATE1) + ")")
+    template2 = re.compile("(?:" + r")\n(?:".join(LICENSE_TEMPLATE2) + ")")
+
+    ok = True
+    for path in rs_sources(exclude):
+        with open(path, "r", encoding="utf-8") as file:
+            file_contents = file.read()
+            if not (template1.search(file_contents) or template2.search(file_contents)):
+                ok = False
+                print("{}: license missing or incorrect".format(path))
+
+    print()
+    return ok
+
+
+# Check TODO(PR) and FIXME instances
+def check_todos():
+    print("==== Checking TODO(PR) and FIXME instances:")
+
+    # List of files/dirs excluded from the check
+    exclude = [
+        # Exclude itself
+        "tools/codecheck.py",
+    ]
+
+    ok = True
+    for path in itertools.chain(
+        rs_sources(exclude),
+        cargo_config_files(exclude),
+        py_sources(exclude),
+        github_workflows(exclude),
+    ):
+        with open(path, "r", encoding="utf-8") as file:
+            file_data = file.read()
+            if "TODO(PR)" in file_data or "FIXME" in file_data:
+                ok = False
+                print("{}: found TODO(PR) or FIXME instances".format(path))
+
+    print()
+    return ok
+
+
+# Check for trailing whitespaces
+def check_trailing_whitespaces():
+    print("==== Checking for trailing whitespaces:")
+
+    # List of files/dirs excluded from the check
+    exclude = ["media", "tests/snapshots"]
+
+    ok = True
+    for path in all_files(exclude):
+        with open(path, "r", encoding="utf-8") as file:
+            try:
+                for line_idx, line in enumerate(file, start=1):
+                    line = line.rstrip("\n\r")
+                    if line != line.rstrip():
+                        ok = False
+                        print(f"{path}: trailing whitespaces at line {line_idx}")
+            except:
+                ok = False
+                print(
+                    f"{path}: can't check for trailing whitespaces, "
+                    "perhaps the file should be in the 'exclude' list?"
+                )
+
+    print()
+    return ok
+
+
+def run_checks():
+    return all(
+        [
+            check_local_licenses(),
+            check_todos(),
+            check_trailing_whitespaces(),
+        ]
+    )
+
+
+if __name__ == "__main__":
+    # Note: this script expects the current directory to be the project root.
+    os.chdir(PROJECT_ROOT_DIR)
+
+    if not run_checks():
+        sys.exit(1)
diff --git a/tools/get_target_id.py b/tools/get_target_id.py
new file mode 100755
index 0000000..364fc80
--- /dev/null
+++ b/tools/get_target_id.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+"""Extract the `ledger.target_id` section from a Ledger app ELF."""
+
+import argparse
+import sys
+
+try:
+    from elftools.elf.elffile import ELFFile
+except ModuleNotFoundError as e:
+    raise SystemExit(
+        "Missing dependency 'pyelftools'. Install it with: python3 -m pip install pyelftools"
+    ) from e
+
+
+def get_target_id(elf_path: str) -> str:
+    with open(elf_path, "rb") as f:
+        elf = ELFFile(f)
+        section = elf.get_section_by_name("ledger.target_id")
+        if section is None:
+            raise SystemExit(f"Section 'ledger.target_id' not found in {elf_path}")
+        return section.data().decode("ascii").strip()
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("elf", help="Path to the Ledger app ELF file")
+    args = parser.parse_args()
+
+    print(get_target_id(args.elf))
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())