__NOTOC__ John Kusiak (born July 20, 1948) is an American composer best known for his work with documentary filmmaker Errol Morris. He won the 2012 Cinema Eye Honors Award for Outstanding Achievement
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 0xc7fafe3fe80429fa4f658a3eaff60d7c9c03862b848e952286bbd213e6d36f8c. 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/8d8a8039-edd2-4d46-b94a-7b21abfde124.json and https://artists.proofprofile.net/proofs/artist/8d8a8039-edd2-4d46-b94a-7b21abfde124.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).