thumb|right|Buckley at the 2007 New York Comic Con Dan Buckley is an American publishing executive, who is known for his work as Publisher, and then as President of Marvel Entertainment from January 2
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 0x02cf3a04483d1beb4f0905f505c43c7eee65b416b06c9ad5e01e894085ae91b9. 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/b9be78e1-9b59-4d3b-9e0d-cea251eca2e3.json and https://artists.proofprofile.net/proofs/artist/b9be78e1-9b59-4d3b-9e0d-cea251eca2e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).