Captain Sir Thomas Moore (30 April 1920 – 2 February 2021), more popularly known as Captain Tom, was a British Army officer and fundraiser. He made international headlines in April 2020 when he raised
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 0xf873a2f70d3479c995f39ce1a92dbd0f839c40f42e5dd247dbc20e96ed6bf2ea. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5fb123d-e0b1-44a1-8d95-54c934f681ce.json and https://artists.proofprofile.net/proofs/artist/b5fb123d-e0b1-44a1-8d95-54c934f681ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).