Verify Receipt

Offline verifier for AINumbers Evidence Envelope v0.1 receipts. Given a receipt JSON, recomputes the RFC 8785 JCS signing preimage, verifies the Ed25519 (EdDSA) signature against the did:key resolved from issuer_id/signatures[].kid, checks hash-field shape (sha256:-prefixed, 64 hex chars), and, when a prior receipt is supplied, recomputes previousReceiptHash to prove the chain link. Verify-only: never issues a receipt, never contacts a transparency log or registry, never resolves a DID document over the network. Every check recomputes from the receipt's own bytes; no self-claimed hash or verdict field is trusted (SO #34).

Tool URL: https://ainumbers.co/chaingraph/art-652-verify-receipt.html AP2/Policy Mandate export: yes