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 0xea466a5dd295b087c699380e2fe1ba80473bf9be2e5244b6fb787114cc3b31bf. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/46d4616d-9992-49cc-ab58-9ea79a8242e1.json and https://artists.proofprofile.net/proofs/artist/46d4616d-9992-49cc-ab58-9ea79a8242e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Works for clarinet by Rameau, Chausson, Puccini, Debussy, Dukas, Satie, Pierné, Koechlin, Ravel, Gershwin and Poulenc