thumb|upright=1.25|Jason, between the jaws of the dragon which guards the Golden Fleece, is saved by Athena. The fleece hangs from a tree behind them. Attic kylix, 480–470 BC, attributed to Douris.Vat
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 0x56c952930b3bc00b649e5ab080bafc55317c1a7a4aa24ac078c07a88286262c4. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/87c272c1-e251-4f05-8b53-2d17d97e33ea.json and https://artists.proofprofile.net/proofs/artist/87c272c1-e251-4f05-8b53-2d17d97e33ea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).