Mark Rothko ( ; Markus Yakovlevich Rothkowitz until 1940; September 25, 1903February 25, 1970) was an American abstract painter. He is best known for his color field paintings that depicted irregular
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 0xbe75cacf799d8301c413c70280959f8787949e15792459699e669a8f9fa02aa2. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/982c625d-6dfc-47d7-ba34-41d46d97ee6c.json and https://artists.proofprofile.net/proofs/artist/982c625d-6dfc-47d7-ba34-41d46d97ee6c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).