Question-seal verification certificate

What this certificate answers

Did cand-467 QHASH-AND-PROVENANCE-SEAL satisfy the exact scope, evidence, dependencies, grader, and prohibitions in this reviewed row?

Question hash: c3aa097a0c9962fd70ede82657be894fa8ea16eb58f80b75f1608d1c62544814

Trace it to the rail

Recorder run 02c4314c-78ef-4253-8547-31734a547115

Grader SHA-256 fec99a77f0d125e9db83eb235f0f2bb729f42d097d6990e30a2179464d405f27

Public-key SHA-256 f660475c08d4bdb806684722d13760d42737d914358d257a2bab1047b5fc2f60

Download signed JSON · canonical payload · detached signature · public key · verification helper · provenance charter

How to verify

The signature is Ed25519 over the exact bytes in payload.json. Download the four files and run:

python3 verify_certificate.py certificate.json public-key.pem

The helper prints VALID only when the public-key digest and signature both match. Change one byte and it exits non-zero.

What this does not claim

• This certificate covers only the named question and recorded inputs at issuance.
• It does not certify future behavior, legal compliance, or facts absent from the rail.
• A valid signature proves byte integrity and signer control, not the truth of an upstream source.

Certificate for your own evidence rail

For an AI governance, procurement, or platform assurance lead: request one signed HTML and JSON certificate generated from an agreed evidence scope. The dedicated request page states the fixed price, delivery window and cancellation terms.

The dedicated request form preserves the exact certificate product token in the submitted message.