Vendôme (, ) is a subprefecture of the department of Loir-et-Cher, France. It is also the department's third-biggest commune with 15,758 inhabitants (2023). It is one of the main towns along the riv
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 0xe9ad06aeee9c72e67c27b0082e0e206bc5782e4887badfae5394250e506853b1. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5aa45e2-d1e1-468c-8164-80940767d114.json and https://artists.proofprofile.net/proofs/artist/c5aa45e2-d1e1-468c-8164-80940767d114.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).