Samuel Lewis Francis (June 25, 1923 – November 4, 1994) was an American painter and printmaker. Early life Sam Francis was born in San Mateo, California,Samuel L. Francis Foundation Foundation websit
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 0x7973aa4ef47b6462345d2add710c6eed736848c5c4941700eb625df51e199cdf. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d89007b-7bbf-4ab0-ac20-f87d56e3fdd9.json and https://artists.proofprofile.net/proofs/artist/8d89007b-7bbf-4ab0-ac20-f87d56e3fdd9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).