thumb|upright=1.25|Sutcliffe, left with fellow oboist Terence MacDonagh centre and cor anglais player John Wolfe, c. 1969|alt=three middle aged white men in informal snapshot, outdoor setting Sidney C
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 0x0b90ce7f073815bb81e326eca34c5204e79eaaea3117bcd4e4d4bfb65eb53cc2. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35763130-ff3c-42cb-8975-2ea591b502e9.json and https://artists.proofprofile.net/proofs/artist/35763130-ff3c-42cb-8975-2ea591b502e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).