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 0x1993903b5ce9952e8b0b59723f316c275cb4fe6fd812078c4028d6901c94946d. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/effcb70e-0380-4c27-ad8d-7ccef16e4381.json and https://artists.proofprofile.net/proofs/artist/effcb70e-0380-4c27-ad8d-7ccef16e4381.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Music from the Fitzwilliam Virginal Book, Vol. 2
Music from the Fitzwilliam Virginal Book, Vol. 1
Queenes Command (The): Masterpieces of Elizabethan Keyboard Music
Bach Edition Vol. 13, Keyboard Works Vol. II Part: 5
Bach Edition Vol. 13, Keyboard Works Vol. II Part: 6