__NOTOC__ Didier is a French masculine given name and surname common throughout the Romance languages. It comes from the Ancient Roman name Didius. During the 5th century AD, with the Christianisation
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 0xdcbe679012bdffd444a4e884bfe7618bf3599229fecbb66b694eb6e6b584b4be. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19bb9d30-6590-45a8-b869-00f28fac030e.json and https://artists.proofprofile.net/proofs/artist/19bb9d30-6590-45a8-b869-00f28fac030e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).