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 0x4caa961a84026d4863d6625c24f902fe92aa298a72418f4f256eb184df767a40. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a0fe124-82d8-4ff5-af10-51d6ec542089.json and https://artists.proofprofile.net/proofs/artist/7a0fe124-82d8-4ff5-af10-51d6ec542089.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).