thumb|Church of St. Charles Borromeo. thumb|A view of Noto Town Hall. thumb|right|A balcony of the Villadorata palace. Noto (; ) is a city and in the Province of Syracuse, Sicily, Italy. It is sout
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 0x5365ed94f665adb9771f8ceb8e96543ca84010bb77f4146a8d3bd903b89cdbd2. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f97b7af8-2d1a-4be0-9351-35f90d5d340c.json and https://artists.proofprofile.net/proofs/artist/f97b7af8-2d1a-4be0-9351-35f90d5d340c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).