thumb|397x397px|Evan Parker, Buffalo, New York (2009) Evan Shaw Parker (born 5 April 1944) is a British tenor and soprano saxophone player who plays free improvisation. Recording and performing prol
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 0x9a0224970ac96a4ee3748858a4c8b944491cd7e386ffacf7184da2be67a7ea89. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfe3059c-05a0-4307-81e2-e367cd0972ba.json and https://artists.proofprofile.net/proofs/artist/cfe3059c-05a0-4307-81e2-e367cd0972ba.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.