Phase 6 Sprint 6.1 - Immutable Logging

Objective

Implement append-only tamper-evident logging with hash-chain integrity and periodic sealing.

Deliverables

• Tamper-evident audit log module.
• Append-only log record writes.
• Hash-chain integrity verification.
• Periodic snapshot sealing.
• Gateway integration for accepted/rejected ingest audit events.
• Unit tests for chain verification and tamper detection.

Exit Criteria

• Log entries are append-only.
• Hash-chain tampering is detectable.
• Periodic seal entries are produced.