Laurence Dreyfus, FBA (born July 28, 1952) is an American musicologist and player of the viola da gamba who was University Lecturer and Fellow of Magdalen College, Oxford. Early life Dreyfus was born
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 0x515b6cf0038f81236661e2458a838902471722435a65e8d0fe790c3398c2b3ae. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9006e65f-16c8-4720-8935-6637c060040f.json and https://artists.proofprofile.net/proofs/artist/9006e65f-16c8-4720-8935-6637c060040f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sonatas for Viola da Gamba and Harpsicord, Bwv 1027 - 1029