thumb|Man wearing a coat, painting by Julian Fałat, 1900|alt=Watercolor painting of a dark-bearded white man in glasses, a hat, and a long, thick, pale-colored coat with a fur collar. The man has his
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8406b2f1e988357f4256c1a0a6d2154ea655a6c532622d7fc3d72a443a808255. Chain 2 (Bitcoin): anchored in block 954017 (2026-06-16T23:38:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/36cce553-ea9a-4e16-aa40-5c711456035c.json and https://artists.proofprofile.net/proofs/artist/36cce553-ea9a-4e16-aa40-5c711456035c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).