thumb|right|220px|Picture from a purported portrait of Jean-Baptiste Duvernoy Jean-Baptiste Duvernoy (c. 1802 – c. 1880) was a French pianist and composer of the Romantic period. He is best known for
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8465a8e432a30cc56e979d53c2aed94141f17ee6298b876f4fc741f96eed958c. Chain 2 (Bitcoin): anchored in block 953714 (2026-06-15T00:43:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8089cd26-4c44-4517-80a5-c08f90efca1a.json and https://artists.proofprofile.net/proofs/artist/8089cd26-4c44-4517-80a5-c08f90efca1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
School of Mechanism, Op. 120: Studio No. 2 in C Major
Jean-Baptiste Duvernoy: School of Mechanism Op. 120
Gianfranco D'elia - Jean-Baptiste Duvernoy - Elementary Studies Op. 176