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 0x1f3121a077bb369be6e3cda6ec08d9d9c00c8f815ec809e8811d96f9b6286762. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1315106-cf31-487e-963b-8bb167b672d7.json and https://artists.proofprofile.net/proofs/artist/b1315106-cf31-487e-963b-8bb167b672d7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mia et le Migou (Bande Originale du Film)
Nina et le secret du hérisson (Bande originale du film)