thumb|The Baker (); oil-on-canvas painting by Job Adriaensz Berckheyde (1630–1693) now held by the Worcester Art Museum. A baker is a tradesperson who bakes and sometimes sells breads and other produ
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 0x09e31fda9e368bbdb8d80b25295f6f17c622b903ac2daa9e770d84cd8669082a. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb0a8e6b-4446-489e-b23d-7fb3dd6e83ca.json and https://artists.proofprofile.net/proofs/artist/bb0a8e6b-4446-489e-b23d-7fb3dd6e83ca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).