thumb|The French prince du sang Louis II de Bourbon with his son. He was a great warrior and a rebel. He triumphed at the battle of Rocroi against the Habsburgs and saved the kingdom of his cousin Lou
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 0xfc8c7bc7fcd1f0c53f327942ac5bdbfdc691c7d10f7dd6e9255ca26d7282813d. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/43aa447a-3ffe-42ce-afa9-d49e42496ee5.json and https://artists.proofprofile.net/proofs/artist/43aa447a-3ffe-42ce-afa9-d49e42496ee5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).