Arkle (19 April 1957 – 31 May 1970) was an Irish-bred Thoroughbred racehorse. A bay gelding by Archive out of Bright Cherry, Arkle was the grandson of the unbeaten Flat racehorse and prepotent sire Ne
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 0x17fc9ff2ddc75b6241c4e4ea50c6fe9ed66a6b3cdb5e99fde5e267dbd641330e. 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/621f27ac-1470-404c-b671-687071fddf75.json and https://artists.proofprofile.net/proofs/artist/621f27ac-1470-404c-b671-687071fddf75.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).