Artful (1902–1927) was an American Thoroughbred racehorse. Background Artful was born at the Westbury Stable at Old Westbury on Long Island into a prominent racing family begun in 1898 by William Col
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b9ba2fb39848686ed654bc5767c3da2b7bd8cd8fee0fba75d32bfcbfe2d503. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/404348fb-c95f-41e4-a4b2-9fb4bb2c7591.json and https://artists.proofprofile.net/proofs/artist/404348fb-c95f-41e4-a4b2-9fb4bb2c7591.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).