Roger "Montego Joe" Sanders (born 1929, New York City; d. June 28, 2010, Brooklyn, New York City) was an American jazz percussionist and drummer. Career Sanders as a teenager played with a number of
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 0xbc303e88f53de82a17f5f8c3e1802a4dc957bd2f2021c5665832b87b1af1b308. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d0d0e0d-f022-4f86-a08b-532d268689c8.json and https://artists.proofprofile.net/proofs/artist/9d0d0e0d-f022-4f86-a08b-532d268689c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).