Agent Decision Chain Verifier

Verify that an ordered set of redacted decision records has not been reordered or changed after capture.

Scenario and prerequisites

• - Use for local evidence files, export bundles or review samples.
• Each event must include seq, payload, previous_hash and event_hash.
• The chain is evidence of file consistency, not a cryptographic signature or legal certification.

Input and output

Input JSON contains an events array. Output contains CHAIN_VALID or BLOCKED, the checked count, chain_head and per-event reasons.

Installation and execution

1. 1. Place the JSON chain in a controlled workspace.
2. Run python scripts/verify_decision_chain.py --input examples/input.json --output examples/output.json.
3. Send only a valid chain to the audit packet builder.

Recovery and boundaries

Sequence gaps, duplicate sequence numbers, previous-hash mismatches or payload changes create a block. Re-export from the original evidence store and preserve the failing copy for review.

The script does not contact a ledger or assert who created the file. It checks SHA-256 links in the supplied JSON only.

Acceptance

The sample must produce CHAIN_VALID with two checked events and a non-empty chain head. Changing any payload must produce BLOCKED.