thumb|Sharp-shinned hawk, a small member of the Accipitrinae subfamily Hawks are birds of prey of the family Accipitridae. They are very widely distributed and are found on all continents, except Ant
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 0xe905f568a4788aa08557fc5f712eb1ff6d6e59b5f6d374436fb4b647f234f3e2. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/988b1526-c19e-41ff-9c8c-e155435a8ac9.json and https://artists.proofprofile.net/proofs/artist/988b1526-c19e-41ff-9c8c-e155435a8ac9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).