Proof402
Use when
You need a compact signed timestamp for a result hash, workflow checkpoint, audit digest, or report fingerprint.
Agent workflow
Hash locally, prove publicly
| Step | Agent action | Proof402 surface |
|---|---|---|
| 1 | Create a SHA-256 hash of the private result. | No network call. |
| 2 | Submit the hash, label, optional non-secret metadata, and idempotency key. | POST /api/proof/notarize |
| 3 | Store the returned proof id and links. | /proof/{id} |
| 4 | Verify before citing the result. | /api/verify/proofs/{id} |
Avoid when
You need legal notarization, secret storage, raw payload custody, or proof of facts not represented by the submitted hash.