The Mark Four
type: MusicGroup
genre: garage rock
description: The Mark Four was an English rock band from Hertfordshire, England. that was formed in 1961. Members included Kenny Pickett (vocals), Eddie Phillips (guitar), John Dalton (bass guitar), Mick Thompson
popularity: 2
followers: 371
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3193dc3d42893d3e2efd86cbd2902b3dac1da15406ef3d691164e4ba20f43beb
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954533
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954533
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a380250f-35ec-49fc-a88d-b41baa190130.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a380250f-35ec-49fc-a88d-b41baa190130.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a380250f-35ec-49fc-a88d-b41baa190130
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T08:57:02Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x3193dc3d42893d3e2efd86cbd2902b3dac1da15406ef3d691164e4ba20f43beb","name":"The Mark Four","registered_at":"2026-06-20T06:42:27Z","symbol":"NIM1542708","token_address":"0xaa963b3401e32587334e39a6142a875d31a6f49d","type":"artist","uuid":"a380250f-35ec-49fc-a88d-b41baa190130"}
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 0x3193dc3d42893d3e2efd86cbd2902b3dac1da15406ef3d691164e4ba20f43beb. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a380250f-35ec-49fc-a88d-b41baa190130.json and https://artists.proofprofile.net/proofs/artist/a380250f-35ec-49fc-a88d-b41baa190130.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T08:57:02Z
  text: {"copyright_id":"0x3193dc3d42893d3e2efd86cbd2902b3dac1da15406ef3d691164e4ba20f43beb","name":"The Mark Four","registered_at":"2026-06-20T06:42:27Z","symbol":"NIM1542708","token_address":"0xaa963b3401e32587334e39a6142a875d31a6f49d","type":"artist","uuid":"a380250f-35ec-49fc-a88d-b41baa190130"}
album: The Creation
  type: MusicAlbum
  date published: 1980-10-01