The Jamaicans
type: MusicGroup
genre: reggae
genre: rocksteady
genre: roots reggae
genre: ska
description: 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
popularity: 11
followers: 4
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x500b2ffa4a294e17687368b794a1265a0e204fad6820b55a1b70fe0d279d646d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953616
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953616
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/17fb4364-e31f-478d-a63c-553a83bab601.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/17fb4364-e31f-478d-a63c-553a83bab601.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/17fb4364-e31f-478d-a63c-553a83bab601
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T08:58:35Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x500b2ffa4a294e17687368b794a1265a0e204fad6820b55a1b70fe0d279d646d","name":"The Jamaicans","registered_at":"2026-06-14T06:59:02Z","symbol":"NIM0374444","token_address":"0xb4aabe2376a3520040608d08c963c027f10a854e","type":"artist","uuid":"17fb4364-e31f-478d-a63c-553a83bab601"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: 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).
  date published: 2026-06-14T08:58:35Z
  text: {"copyright_id":"0x500b2ffa4a294e17687368b794a1265a0e204fad6820b55a1b70fe0d279d646d","name":"The Jamaicans","registered_at":"2026-06-14T06:59:02Z","symbol":"NIM0374444","token_address":"0xb4aabe2376a3520040608d08c963c027f10a854e","type":"artist","uuid":"17fb4364-e31f-478d-a63c-553a83bab601"}