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 0xce751b1423ea14b629c754c757c6d8557d24ba46dd9b13b2ed1bfb6f5278cfe0. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ae6636f9-9d89-4196-a8d9-6fa0e1b3c9d1.json and https://artists.proofprofile.net/proofs/artist/ae6636f9-9d89-4196-a8d9-6fa0e1b3c9d1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Les Brigades du Tigre (Jérôme Cornuau's Original Motion Picture Soundtrack)
Les brigades du tigre (Original Motion Picture Soundtrack)
Une Nuit (Bande originale du film de Philippe Lefebvre)