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 0x7a441b74b2a3945dc3d5d8191f3519fdcde3ec428fb4b2cd6e82ceebca95bc90. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b44c9b77-0bb2-46fa-9702-2064066f6e6c.json and https://artists.proofprofile.net/proofs/artist/b44c9b77-0bb2-46fa-9702-2064066f6e6c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Viola Da Gamba Recital: Rozendaal, John Mark - Goodall, S. / Simpson, C. / Sumarte, R. / Younge, W.