thumb|Triple Portrait of Crewe's wife, Mary Done, by William Dobson, painted 1635-38 John Crewe or Crew (1603 – 12 May 1670) was an English barrister and politician who sat in the House of Commons in
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954aac9e41e3f1c8dd4fc726f8966c57e0bf4b121b3698a0bf97a0caee2626f3. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76529c6f-3ee5-40a4-8bf5-9496b1f971a9.json and https://artists.proofprofile.net/proofs/artist/76529c6f-3ee5-40a4-8bf5-9496b1f971a9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).