Joseph Harold Negri (born June 10, 1926) is an American jazz guitarist and educator. He appeared as himself and as "Handyman Negri" in the Neighborhood of Make-Believe segments on Mister Rogers' Neigh
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 0xe5ee223cdb421284f44d9a71180cf8b0d444b591760dd4b64c7650cbd86d18a0. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/875d19ea-da2c-40e0-b415-835bcae06097.json and https://artists.proofprofile.net/proofs/artist/875d19ea-da2c-40e0-b415-835bcae06097.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).