A canapé () is a type of starter, a small, prepared, and often decorative food, consisting of a small piece of bread (sometimes toasted) or cracker, wrapped or topped with some savoury food, held in t
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d90ffdca9498990fe0ff19ddf1e7229c0c2e86260da869fbe0b37a3f4653458. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10d9745e-e385-423c-95e7-0143d862e93f.json and https://artists.proofprofile.net/proofs/artist/10d9745e-e385-423c-95e7-0143d862e93f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).