thumb|right|300px|Reisch's book in the Science Museum at Wroughton Gregor Reisch (c. 1467 – 9 May 1525) was a German Carthusian monk and humanist scholar. He is best known for his compilation Margari
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 0xb1349824e0c52448a006ae5ca5629c9abdfdea6262e3bd1872078e5539140dd4. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/161a6c8a-fc96-4a8a-a437-e344912dcf59.json and https://artists.proofprofile.net/proofs/artist/161a6c8a-fc96-4a8a-a437-e344912dcf59.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).