diff --git a/wallet/Cargo.toml b/wallet/Cargo.toml
index fce4026c06..1f6caa0b9d 100644
--- a/wallet/Cargo.toml
+++ b/wallet/Cargo.toml
@@ -53,4 +53,8 @@ tempfile.workspace = true
 [features]
 trezor = ["dep:trezor-client", "wallet-types/trezor"]
 enable-trezor-device-tests = []
+# Note: currently this is used in certain external tests (in particular, in the bridge), so we only
+# allow it for regtest. TODO: it's better to have some regtest-specific options for the wallet,
+# similar to what we have for the node.
+use-deterministic-signatures-in-software-signer-for-regtest = []
 default = ["trezor"]
diff --git a/wallet/src/signer/software_signer/mod.rs b/wallet/src/signer/software_signer/mod.rs
index 58299b03d4..f5036784d8 100644
--- a/wallet/src/signer/software_signer/mod.rs
+++ b/wallet/src/signer/software_signer/mod.rs
@@ -19,6 +19,7 @@ use itertools::Itertools;
 
 use common::{
     chain::{
+        config::ChainType,
         htlc::HtlcSecret,
         signature::{
             inputsig::{
@@ -46,7 +47,7 @@ use common::{
 use crypto::key::{
     extended::{ExtendedPrivateKey, ExtendedPublicKey},
     hdkd::{derivable::Derivable, u31::U31},
-    PrivateKey, SigAuxDataProvider,
+    PredefinedSigAuxDataProvider, PrivateKey, SigAuxDataProvider,
 };
 use randomness::make_true_rng;
 use wallet_storage::{
@@ -76,7 +77,22 @@ pub struct SoftwareSigner {
 
 impl SoftwareSigner {
     pub fn new(chain_config: Arc<ChainConfig>, account_index: U31) -> Self {
-        Self::new_with_sig_aux_data_provider(chain_config, account_index, Box::new(make_true_rng()))
+        let use_deterministic_signer = *chain_config.chain_type() == ChainType::Regtest
+            && cfg!(feature = "use-deterministic-signatures-in-software-signer-for-regtest");
+
+        if use_deterministic_signer {
+            Self::new_with_sig_aux_data_provider(
+                chain_config,
+                account_index,
+                Box::new(PredefinedSigAuxDataProvider),
+            )
+        } else {
+            Self::new_with_sig_aux_data_provider(
+                chain_config,
+                account_index,
+                Box::new(make_true_rng()),
+            )
+        }
     }
 
     pub fn new_with_sig_aux_data_provider(
diff --git a/wallet/types/src/partially_signed_transaction.rs b/wallet/types/src/partially_signed_transaction.rs
index 091bec1612..063d9cf11c 100644
--- a/wallet/types/src/partially_signed_transaction.rs
+++ b/wallet/types/src/partially_signed_transaction.rs
@@ -32,8 +32,9 @@ use common::{
             Signable, Transactable,
         },
         tokens::TokenId,
-        ChainConfig, Destination, OrderId, PoolId, SighashInputCommitmentVersion,
-        SignedTransaction, Transaction, TransactionCreationError, TxInput, TxOutput,
+        AccountCommand, ChainConfig, Destination, OrderAccountCommand, OrderId, PoolId,
+        SighashInputCommitmentVersion, SignedTransaction, Transaction, TransactionCreationError,
+        TxInput, TxOutput,
     },
     primitives::{Amount, BlockHeight},
 };
@@ -160,6 +161,14 @@ impl TxAdditionalInfo {
         self.order_info.get(order_id)
     }
 
+    pub fn token_info_iter(&self) -> impl Iterator<Item = (&'_ TokenId, &'_ TokenAdditionalInfo)> {
+        self.token_info.iter()
+    }
+
+    pub fn pool_info_iter(&self) -> impl Iterator<Item = (&'_ PoolId, &'_ PoolAdditionalInfo)> {
+        self.pool_info.iter()
+    }
+
     pub fn order_info_iter(&self) -> impl Iterator<Item = (&'_ OrderId, &'_ OrderAdditionalInfo)> {
         self.order_info.iter()
     }
@@ -211,31 +220,51 @@ pub struct PartiallySignedTransaction {
 }
 
 impl PartiallySignedTransaction {
-    pub fn new(
+    pub fn new_unchecked(
         tx: Transaction,
         witnesses: Vec<Option<InputWitness>>,
         input_utxos: Vec<Option<TxOutput>>,
         destinations: Vec<Option<Destination>>,
         htlc_secrets: Option<Vec<Option<HtlcSecret>>>,
         additional_info: TxAdditionalInfo,
-    ) -> Result<Self, PartiallySignedTransactionError> {
+    ) -> Self {
         let htlc_secrets = htlc_secrets.unwrap_or_else(|| vec![None; tx.inputs().len()]);
 
-        let this = Self {
+        Self {
             tx,
             witnesses,
             input_utxos,
             destinations,
             htlc_secrets,
             additional_info,
-        };
+        }
+    }
 
-        this.ensure_consistency()?;
+    pub fn new(
+        tx: Transaction,
+        witnesses: Vec<Option<InputWitness>>,
+        input_utxos: Vec<Option<TxOutput>>,
+        destinations: Vec<Option<Destination>>,
+        htlc_secrets: Option<Vec<Option<HtlcSecret>>>,
+        additional_info: TxAdditionalInfo,
+    ) -> Result<Self, PartiallySignedTransactionError> {
+        let this = Self::new_unchecked(
+            tx,
+            witnesses,
+            input_utxos,
+            destinations,
+            htlc_secrets,
+            additional_info,
+        );
 
+        this.ensure_consistency(Self::need_heavy_consistency_checks())?;
         Ok(this)
     }
 
-    pub fn ensure_consistency(&self) -> Result<(), PartiallySignedTransactionError> {
+    pub fn ensure_consistency(
+        &self,
+        with_heavy_checks: bool,
+    ) -> Result<(), PartiallySignedTransactionError> {
         ensure!(
             self.tx.inputs().len() == self.witnesses.len(),
             PartiallySignedTransactionError::InvalidWitnessCount
@@ -256,18 +285,18 @@ impl PartiallySignedTransaction {
             PartiallySignedTransactionError::InvalidHtlcSecretsCount
         );
 
-        #[cfg(debug_assertions)]
-        {
+        if with_heavy_checks {
             self.ensure_additional_info_completeness()?;
         }
 
         Ok(())
     }
 
-    #[cfg(debug_assertions)]
-    fn ensure_additional_info_completeness(&self) -> Result<(), PartiallySignedTransactionError> {
-        use common::chain::{AccountCommand, OrderAccountCommand};
+    fn need_heavy_consistency_checks() -> bool {
+        cfg!(debug_assertions)
+    }
 
+    fn ensure_additional_info_completeness(&self) -> Result<(), PartiallySignedTransactionError> {
         let ensure_order_info_present =
             |order_id: &OrderId| -> Result<_, PartiallySignedTransactionError> {
                 ensure!(
@@ -387,7 +416,7 @@ impl PartiallySignedTransaction {
         witnesses: Vec<Option<InputWitness>>,
     ) -> Result<Self, PartiallySignedTransactionError> {
         self.witnesses = witnesses;
-        self.ensure_consistency()?;
+        self.ensure_consistency(Self::need_heavy_consistency_checks())?;
         Ok(self)
     }