thumb|A classic brown felt men's pork pie hat from the 1940s. The bow in the back of the hat conceals a small button on a string which winds around the hat: in windy weather the button would be attac
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 0x69cfcbec0dfd93945b88b46eb67d40647fc7475b59516bbea21716061a0eb043. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e7d8c408-ebe8-422b-8b49-15fc3b242b87.json and https://artists.proofprofile.net/proofs/artist/e7d8c408-ebe8-422b-8b49-15fc3b242b87.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).