Joseph Rupert Benjamin (November 4, 1919 – January 26, 1974) was an American jazz bassist. Born in Atlantic City, New Jersey, Benjamin played with many jazz musicians in a variety of idioms. Early in
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 0x44010a1f9d066e8235fe378380666807595b9b7d63a1103187cf02306254635a. Chain 2 (Bitcoin): anchored in block 954019 (2026-06-16T23:44:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/36d32e56-1b22-4b14-92cb-46c8dee287a7.json and https://artists.proofprofile.net/proofs/artist/36d32e56-1b22-4b14-92cb-46c8dee287a7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).