thumb|right|Yves Brunier, November 2006. Yves Brunier (born 1943) is a French puppeteer. He is best known for his character, Casimir, an orange colored dinosaur who appears on French Children's TV. He
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 0x29bb726946c3719c877e0fc958990297c9752f98f6e24eec4451a2d04849ac4d. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8142b55-2c31-4b3d-8afd-99c0e1fa45c4.json and https://artists.proofprofile.net/proofs/artist/a8142b55-2c31-4b3d-8afd-99c0e1fa45c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).