Doris Emrick Lee (February 1, 1905 – June 16, 1983) was an American painter known for her figurative painting and printmaking. She won the Logan Medal of the Arts from the Chicago Art Institute in 193
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 0x0a3c32d09f418f56d28e8d8ea121d58c3fa9ae1f4480c32bab4cc049db440af9. 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/5aa34cfc-6646-4c49-887e-c912d371e238.json and https://artists.proofprofile.net/proofs/artist/5aa34cfc-6646-4c49-887e-c912d371e238.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).