Laurent David (born 9 January 1971) is a French football manager and former player who manages Les Herbiers VF. A midfielder, he played in Ligue 1 for Martigues and in Ligue 2 for Brest, Sedan, Mulhou
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 0x26fa0a4723666aa481c311d6b236b4d0370a465f155b9c83c7fab6826f107f4c. Chain 2 (Bitcoin): anchored in block 953959 (2026-06-16T14:51:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2756a132-0c00-4d2b-bdba-b22cfa08af44.json and https://artists.proofprofile.net/proofs/artist/2756a132-0c00-4d2b-bdba-b22cfa08af44.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).