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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a090d672f16fe8cce1c905db199758837c2ff2706f570260dda08d2c427a97. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6b24edd-4aca-4eb7-89f5-dacf2db5d0ff.json and https://artists.proofprofile.net/proofs/artist/e6b24edd-4aca-4eb7-89f5-dacf2db5d0ff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lorca: Romancero gitano - Krynen: 3 Chants Funebres
Cras, J.: 4 Danze / 2 Paysages / 5 Poemes Intimes