John or Johnny Graham may refer to: Arts and entertainment John Graham (history painter) (fl. 1720–1775), English painter John Graham (Scottish painter) (1754–1817), Scottish painter and teacher of a
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 0xddfcb13d588f56861cb49150e015e1b9cdecf798fe3071433bb7df66625b84cd. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a263a999-481b-4d49-adf6-ebf5c5a224da.json and https://artists.proofprofile.net/proofs/artist/a263a999-481b-4d49-adf6-ebf5c5a224da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).