The Jamaicans were a ska/rocksteady group formed in Jamaica in 1967, consisting of members Tommy Cowan, Norris Weir, Derrick Brown and Martin Williams. Career The Jamaicans originally started out 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 0x500b2ffa4a294e17687368b794a1265a0e204fad6820b55a1b70fe0d279d646d. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17fb4364-e31f-478d-a63c-553a83bab601.json and https://artists.proofprofile.net/proofs/artist/17fb4364-e31f-478d-a63c-553a83bab601.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).