Audit Trail & Verification
Cryptographic hash-chain audit trail for contract integrity.
Immutable Audit Trail
Every contract action in PROOF is recorded in an append-only audit trail with SHA-256 hash chain verification. This means every event — from offer sent to payment released — is cryptographically linked to the previous event, creating a tamper-proof record.
What's Tracked
- All 12 contract state transitions (offer, accept, counter, decline, etc.)
- Full contract term snapshots at each version (stored in contract_versions table)
- Timestamp, actor, and action for every event
- SHA-256 hash linking each event to the previous one
Chain Verification
PROOF provides a chain verification endpoint that validates the integrity of any contract's audit trail. If any event in the chain has been tampered with, the verification will fail — providing cryptographic proof of data integrity.
Contract PDFs include audit trail information and hash verification data, making them suitable for legal and compliance record-keeping.
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