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 0xf81a5e93e16ee8d404033a8190cde8ef266ab427caf65f8a73ffbda51380934e. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1090f53d-3d31-444d-bf68-8fa2fd0b74c1.json and https://artists.proofprofile.net/proofs/artist/1090f53d-3d31-444d-bf68-8fa2fd0b74c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vintage World No. 168 - EP: Musique De Cirque
Vintage Belle Epoque No. 52 - EP: Le French Can-Can De Paris
La musique de cirque (The Best of Circus Music)