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 0xedbf3f45cdda3ffaee00294f12c4ce98104dd043aa60d1d43048ead8f9ba1e6d. Chain 2 (Bitcoin): anchored in block 953871 (2026-06-16T01:46:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07674890-bcab-4761-bd7c-c020018f7321.json and https://artists.proofprofile.net/proofs/artist/07674890-bcab-4761-bd7c-c020018f7321.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Harpsichord Recital, 24 Preludes: Rameau, J.P. / Handel, G.F. / Sweelinck, J.P. / Bach, J.S. / D'Anglebert, J.H. / Bull, J.
Harpsichord Recital: Perrin, Catherine - Rameau, J.-P. / Handel, G.F. / Sweelinck, J.P. / Bach, J.S. / D'Anglebert, J.-H. / Bull, J. (24 Preludes)
Bach, J.C. / Haydn / Mozart: Keyboard Music