thumb|upright|Poster for the Holzer Fashion Store, 1902 thumb|Police can sometimes put up a poster to let the public know about a criminal. A poster is a large sheet, usually made of some type of pap
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 0x40dd4aad50f7c8fa72cffa97fa79da0eee6e5ad241115fe65804c852b256451f. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1395cd1d-ed79-48bf-b086-a2efff0c216d.json and https://artists.proofprofile.net/proofs/artist/1395cd1d-ed79-48bf-b086-a2efff0c216d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).