David Humphrey (born August 30, 1955) is an American painter, art critic, and sculptor associated with the postmodern turn in painting that began in the late 1970s.Artist Profile , Art MultipleDavid H
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 0x45867a7c49bf20126cd0836c0e0ea1f09b520ed3e7d3e83d9bc44f05a88ad482. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b704a8a4-618a-4268-8161-0b6aae2d5c1a.json and https://artists.proofprofile.net/proofs/artist/b704a8a4-618a-4268-8161-0b6aae2d5c1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).