Mark Holden
type: MusicGroup
description: Mark Ronald Holden (born 27 April 1954) is an Australian singer, actor, TV personality, record producer, songwriter, and barrister. He was a pop star in the 1970s and had four top 20 hit singles, "Nev
popularity: 2
followers: 428
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0e78945fa94931b5213cd915dd2927fc249f1a04931e8e84c3433530deede9ed
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/84450614-1510-4c48-bb5a-3b651f499457.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/84450614-1510-4c48-bb5a-3b651f499457.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/84450614-1510-4c48-bb5a-3b651f499457
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x0e78945fa94931b5213cd915dd2927fc249f1a04931e8e84c3433530deede9ed","name":"Mark Holden","registered_at":"2026-06-17T11:36:14Z","symbol":"NIM1383125","token_address":"0x4c58ae4c92d8a61fa728f2f4fd44da6a0b9ec2d3","type":"artist","uuid":"84450614-1510-4c48-bb5a-3b651f499457"}
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 0x0e78945fa94931b5213cd915dd2927fc249f1a04931e8e84c3433530deede9ed. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84450614-1510-4c48-bb5a-3b651f499457.json and https://artists.proofprofile.net/proofs/artist/84450614-1510-4c48-bb5a-3b651f499457.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0x0e78945fa94931b5213cd915dd2927fc249f1a04931e8e84c3433530deede9ed","name":"Mark Holden","registered_at":"2026-06-17T11:36:14Z","symbol":"NIM1383125","token_address":"0x4c58ae4c92d8a61fa728f2f4fd44da6a0b9ec2d3","type":"artist","uuid":"84450614-1510-4c48-bb5a-3b651f499457"}
album: Live At The George Ballroom
  type: MusicAlbum
  date published: 2005