Barthez is a surname. Notable people with the surname include: Fabien Barthez (born 1971), French FIFA World Cup winning goalkeeper Guillaume Barthez de Marmorières (1707–1799) French civil enginee
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 0x774cdc76d5a533ca4ff135dc35609fca3cede4650a0769e0366a4ebe1b07e257. 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/f9e2707d-128c-433a-9e29-e15ac5eab53b.json and https://artists.proofprofile.net/proofs/artist/f9e2707d-128c-433a-9e29-e15ac5eab53b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).