Jan Bach (December 11, 1937 – October 30, 2020) was an American composer. He taught at the University of Tampa (Florida) from 1965 to 1966 and at Northern Illinois University in DeKalb, Illinois (musi
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 0xb6f0d5bdaa4b4792c782f3b0f3d9719bf7c0b14ec60fc650976ee0485467d6c3. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0545cbab-1a72-43d6-9a66-46daa30f01c1.json and https://artists.proofprofile.net/proofs/artist/0545cbab-1a72-43d6-9a66-46daa30f01c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).