Jeffrey David Bradetich (born 1957) is an American professor and performer of double bass. He currently teaches at the University of North Texas College of Music. Bradetich made his New York City deb
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 0x07ce7601be533f9299c938b12fabf65a230343f81293192ab347588b0e9ffbf2. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4b88ad1-9ee9-482a-9cb1-cccb8ed63e54.json and https://artists.proofprofile.net/proofs/artist/d4b88ad1-9ee9-482a-9cb1-cccb8ed63e54.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Double Bass Portraits - A Musical Exhibition