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 0x1c5b4c7ecc5952152f95dc99a5a63e66afd42fe93244fb398f12d15e5b9fdc49. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef5b6f4e-3015-4c28-a002-d47b1a69b803.json and https://artists.proofprofile.net/proofs/artist/ef5b6f4e-3015-4c28-a002-d47b1a69b803.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
C'est en souhaitant bonsoir (Breton Music / Celtic Music from Brittany / Keltia Musique - Bretagne)
An Dro (Breton Group - Celtic Music from Brittany - Keltia Musique - Bretagne)