Resposta curta
A guardrail receipt is a tamper-evident audit record proving that an AI guardrail evaluation occurred with a defined policy, input scope, and timestamp. It can be made more trustworthy by cryptographic hashing, OpenTimestamps anchoring to Bitcoin, and WORM retention.
TL;DR
- A guardrail receipt records what was checked, which guardrail policy applied, and what decision was produced.
- Cryptographic hashes make the receipt tamper-evident: changes to the record or evidence change the hash.
- OpenTimestamps can anchor a receipt hash to Bitcoin, supporting proof of existence at or before a point in time.
- WORM storage preserves receipts as write-once, read-many objects, reducing the risk of deletion or alteration.
- Guardrail receipts support audits, incident response, vendor review, and internal accountability.
- They do not, by themselves, prove legal compliance, factual accuracy, or harmless outcomes.
What is a guardrail receipt?
A guardrail receipt is an audit artifact for an AI control event. It shows that a request, response, moderation action, or safety check passed through a known guardrail process.
The receipt should identify the event, the policy version, the system component, and the outcome. It is more useful than a raw log when it is structured, hash-bound, and retained in an auditable way.
How does hashing make the receipt trustworthy?
A cryptographic hash turns the receipt and its related evidence into a compact digest. If any field changes later, the digest changes too.
This does not make the original content true. It makes later alteration detectable, which is essential for trust, forensics, and dispute resolution.
How do OpenTimestamps and Bitcoin help?
OpenTimestamps can create timestamp proofs by anchoring hashes to public ledgers such as Bitcoin. Because Bitcoin maintains a public, append-oriented transaction history, it can provide an independently verifiable reference point for when a hash existed.
The receipt can remain private while only its digest is anchored. This supports confidentiality while preserving tamper evidence.
Why use WORM storage for receipts?
WORM means write once, read many. In a WORM-compatible storage model, receipts are retained so they cannot be normally rewritten or deleted during the retention period.
OpenTimestamps helps prove that a record existed. WORM helps preserve the record itself. Together, they strengthen the audit chain from creation to review.
What should a guardrail receipt include?
A practical receipt should include event identifiers, timestamps, policy identifiers, model or guardrail version, action taken, and hashes of the prompt, response, evidence, or decision bundle.
It should also include metadata about who or what generated the receipt, the evaluation environment, and any exceptions. The goal is reconstructability without exposing unnecessary personal data.
Perguntas frequentes
- Q: Does a guardrail receipt prove the AI output was correct?
A: No. It proves that a controlled process produced a record and that the record was preserved or anchored in a tamper-evident way.
- Q: Can OpenTimestamps replace access controls?
A: No. OpenTimestamps supports timestamp evidence, but identity management, logging, retention policy, and authorization are still required.
- Q: Is Bitcoin anchoring required for every receipt?
A: Not necessarily. High-risk or disputed events may justify external anchoring, while routine events may rely on internal hash chains and WORM retention.
- Q: Does WORM mean the record can never be reviewed?
A: No. WORM supports read access and auditability while preventing ordinary rewriting or deletion during the retention period.
Fatos-chave
- OpenTimestamps is designed to create timestamp proofs using cryptographic digests and blockchain attestations, including Bitcoin.
- Bitcoin provides a public ledger that can support proof that a given hash was included in a timestamping operation.
- WORM storage is a write-once, read-many preservation model used for immutable or retention-controlled records.
- A guardrail receipt is strongest when it binds policy version, event metadata, decision outcome, and cryptographic hashes.
Fontes
- OpenTimestamps project documentation: https://opentimestamps.org/
- Satoshi Nakamoto, “Bitcoin: A Peer-to-Peer Electronic Cash System”: https://bitcoin.org/bitcoin.pdf
- IETF RFC 3161, “Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP)”: https://www.rfc-editor.org/rfc/rfc3161
- IBM Cloud Object Storage documentation, including immutable/WORM object storage concepts: https://www.ibm.com/docs/en/cloud-object-storage
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