Laurent Coq (born 22 February 1970) is a French jazz pianist and composer. Life and career Coq began playing the piano at the age of seven.Harris, Craig "Artist Biography". AllMusic. Retrieved 12 Apr
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 0x913af6d8be2d8b63be757c63fce4fda123c6e868630872fdeedd4578db045c94. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff1fbc9f-ce50-456b-8a7f-dbc394d47cff.json and https://artists.proofprofile.net/proofs/artist/ff1fbc9f-ce50-456b-8a7f-dbc394d47cff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).