Jack Fina (August 13, 1913 – May 14, 1970) was a bandleader, songwriter, and pianist. Fina was born in Passaic, New Jersey, and educated at the New York College of Music and was a student of August F
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 0x59fb2215880b70f169401f9b94167674838b4159abb9dccb112cb7c320625b5f. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56eecbce-8f8a-43d5-a6bd-2dca32183d52.json and https://artists.proofprofile.net/proofs/artist/56eecbce-8f8a-43d5-a6bd-2dca32183d52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).