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 0xcc0fb195efbdc86b91945b78c5ba1c747d5bd57ed7d2ea8ef3df8b41c0108351. Chain 2 (Bitcoin): anchored in block 954032 (2026-06-17T01:59:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3bd6375e-f8f9-4118-b26b-bd6f75133790.json and https://artists.proofprofile.net/proofs/artist/3bd6375e-f8f9-4118-b26b-bd6f75133790.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Choral Music - Wade, J. / Rutter, J. / Grainger, P. / Head, M. / Leontovitch, M. / Dirksen, R. / Pinkham, D. (St. John's Cathedral Choir)