thumb|Stockless ship's anchor and chain on display thumb|Anchor of Amoco Cadiz in Portsall, north-west Brittany, France thumb|Memorial anchor in Kirjurinluoto, Pori, Finland thumb|Massive anchor chain
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 0x0f68e1eb4de8ba95845c64e0fe6169f31f06d02d1a131f997f3d06d65b730c91. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3b923c4-2cb3-4893-bcbe-7e38212fc289.json and https://artists.proofprofile.net/proofs/artist/d3b923c4-2cb3-4893-bcbe-7e38212fc289.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).