Richard Horne (9 May 1960, Coventry – 10 January 2007, Papil, West Burra), better known by the pen name Harry Horse, was a British author, illustrator and political cartoonist. He was also known as le
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 0x0b1db6e9ebf9d3d5593e2be62c8d5264638e0babe235968a16423a38ace4d1e6. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21df91b4-620b-4bfd-b8ff-abe52b89e366.json and https://artists.proofprofile.net/proofs/artist/21df91b4-620b-4bfd-b8ff-abe52b89e366.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).