Pascal Dubreuil (born c. 1970) is a French harpsichordist, a teacher and a specialist of musical rhetoric. Biography After several years study with Yannick le Gaillard, Pascal Dubreuil was awarded
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 0xd453bbf9aac645017ff08d0c5650752510f43f11fcb88b55121b06d33207a38f. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/96638ff1-04d7-4dd4-af92-6a837836c85c.json and https://artists.proofprofile.net/proofs/artist/96638ff1-04d7-4dd4-af92-6a837836c85c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).