thumb|Colin Skinner holding a year old kiwi Colin Skinner (born 1965) is a British author, adventurer and molecular biologist who is attempting to walk around the world. As of mid-2014, he has walke
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 0x6d063fb3076cef8f101487dd29b91f1147d219fe68bd951393cc8d2681f9be29. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/169da442-47c3-4ce3-aed3-a0d73c0d7c33.json and https://artists.proofprofile.net/proofs/artist/169da442-47c3-4ce3-aed3-a0d73c0d7c33.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.