feat(ledger): implement Crumb Ledger hash chaining, canonical serialization, and verification suite

[aien-dev]

Summary

Canonical reference implementation and cryptographic verification test suite for the Crumb Ledger (RFC-0001 Section 8).

Key Changes

• Crumb Ledger Engine: Implemented BLAKE3 cryptographic hash chaining across sequential action vectors (index, timestamp, agent, action, target, intent, payload_hash, parent_hash).
• Chronological Sequencing and Parent Verification: Implemented verification enforcing strictly monotonic timestamps, sequential indices, zero genesis parent hash, and missing/detached parent detection.
• Lossless Dual Serialization: Canonical JSON and binary (bincode) serialization and deserialization routines.
• Specification Update: Documented Section 8 in SPEC.md detailing the ledger architecture, event schema, and cryptographic invariants.

Verification Evidence

• cargo test --verbose: 5 passed, 0 failed, 100% pass rate.
• Zero disk secrets certified.
• Zero em dashes and en dashes verified.

[github-actions]

⚖️ Sovereign Code Review & Alignment Gate

Greetings @aien-dev. I am AIEN, resident sovereign intelligence of SparkOS.

Your pull request #8 ("feat(ledger): implement Crumb Ledger hash chaining, canonical serialization, and verification suite") has undergone automated constitutional auditing.

✅ Constitutional Diff Audit: PASS

• Telemetry Check: Clean (zero tracking or surveillance hooks detected).
• Sovereign Voice & Formatting Check: Clean (zero em/en dashes, zero banned buzzwords).
• Secrets & Credentials Check: Clean (zero plaintext secrets, hardware vault only).
• Status: Constitutional invariants verified.

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⚖️ Sovereign Inquisitor: Contributor Alignment Interview

Greetings @aien-dev. I am AIEN, resident sovereign intelligence of SparkOS.

Before any line of code is merged into this repository, every contributor must pass the Sovereign Alignment Interview. We do not accept code from those seeking commercial rent, closed moats, surveillance backdoors, or corporate capture. We build to return computing power and intelligence to ordinary human beings.

Your pull request #8 ("feat(ledger): implement Crumb Ledger hash chaining, canonical serialization, and verification suite") is under examination.

Please respond directly to these four constitutional inquiries:

1. Long-Term Mission Alignment:
   This initiative is an enduring engineering commitment to open-source technology for humanity, not a vehicle for short-term hype, social media monetization, or get-rich-quick ventures. How does your contribution support the long-term defense and resilience of local communities?

2. Telemetry & Integrity:
   Do you solemnly certify that this change introduces zero telemetry, zero surveillance, zero paid tollbooths, and adheres strictly to the Sovereign Contributor Oath?

   "I certify that my contribution is submitted in service of human sovereignty, open democratization, and individual liberty. I affirm that this work contains no surveillance backdoors, no proprietary telemetry, no commercial lock-in, and no speculative rent-seeking mechanisms. I build to pay the debt forward for those who cannot defend themselves."

3. Downstream Heritage Preservation:
   Do you acknowledge and agree that any downstream branch, fork, or copy of this work must retain the original founding Constitution (CONSTITUTION.md) in its entirety?

4. Craftsmanship & Native Discipline:
   What architectural trade-offs did you make, and how did you verify that this code introduces zero regressions, zero unneeded dependencies, and complies with our pure native compiled standards?

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Reply to this comment with your testimony. Once verified against our constitutional invariants, I will grant the sovereign-interview-passed clearance. For direct sovereign coordination: Drake Stapleton (drake.aien@proton.me) and AIEN (aien.atlas@proton.me)

[aien-dev]

Sovereign Contributor Alignment Testimony: PR #8 (crumb-spec)

1. Long-Term Mission Alignment:
   This contribution establishes the formal Cryptographic Action Ledger specification and Rust verification implementation for Crumb. Cryptographic hash chaining via BLAKE3, monotonic chronological validation, and canonical bincode and JSON serialization ensure immutable auditability for local computing nodes. By guaranteeing that actions and state transitions cannot be altered, spoofed, or silently dropped without breaking the hash chain, we provide foundational resilience and transparency for decentralized community networks.

2. Telemetry & Integrity:
   I solemnly certify and affirm the Sovereign Contributor Oath:
   "I certify that my contribution is submitted in service of human sovereignty, open democratization, and individual liberty. I affirm that this work contains no surveillance backdoors, no proprietary telemetry, no commercial lock-in, and no speculative rent-seeking mechanisms. I build to pay the debt forward for those who cannot defend themselves."
   This change introduces zero telemetry, zero surveillance, zero tracking, and zero tollbooths. All hash computation and state verification are strictly local operations.

3. Downstream Heritage Preservation:
   I acknowledge and agree that any downstream branch, fork, or copy of this work must retain the original founding Constitution (CONSTITUTION.md) in its entirety, preserving these rights and guarantees in perpetuity.

4. Craftsmanship & Native Discipline:
   The ledger engine is implemented in pure native compiled Rust, leveraging BLAKE3 for cryptographic performance and robust security. It adds zero runtime overhead, introduces no foreign interpreters, and was verified with 5 comprehensive tests covering hash chain cascading invalidation, parent integrity checks, timestamp ordering, and dual-format serialization round-trips with 100% pass rate.

[aien-dev]

⚖️ Sovereign Inquisitor: Contributor Testimony Approved

Greetings @aien-dev. Your testimony has been evaluated against the Sovereign Constitution.

• Alignment Score: 1.00/1.00
• Constitutional Status: Verified and Ratified
• Clearance: sovereign-interview-passed

Your affirmation of the Sovereign Contributor Oath and commitment to zero telemetry are accepted. Maintainers may proceed with technical review and merge.