Mark Campbell
type: MusicGroup
genre: avant-garde
genre: choral
description: Mark or Marc Campbell may refer to: Mark Campbell (defensive tackle) (born 1972), American football player Mark Campbell (tight end) (born 1975), American football player Mark Campbell (footballer) (b
popularity: 3
followers: 76
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3bff69662da744b107c1cb81981cbd6e4685314ee703b1886a9ef0a9c4901a11
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954346
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954346
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/94b5c45e-502f-4d0f-80ac-c0f879cfb031.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/94b5c45e-502f-4d0f-80ac-c0f879cfb031.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/94b5c45e-502f-4d0f-80ac-c0f879cfb031
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x3bff69662da744b107c1cb81981cbd6e4685314ee703b1886a9ef0a9c4901a11","name":"Mark Campbell","registered_at":"2026-06-17T17:32:36Z","symbol":"NIM1468099","token_address":"0xaf4fe9c4f6c9105c1192b86248b0ca440d2a463b","type":"artist","uuid":"94b5c45e-502f-4d0f-80ac-c0f879cfb031"}
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 0x3bff69662da744b107c1cb81981cbd6e4685314ee703b1886a9ef0a9c4901a11. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/94b5c45e-502f-4d0f-80ac-c0f879cfb031.json and https://artists.proofprofile.net/proofs/artist/94b5c45e-502f-4d0f-80ac-c0f879cfb031.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0x3bff69662da744b107c1cb81981cbd6e4685314ee703b1886a9ef0a9c4901a11","name":"Mark Campbell","registered_at":"2026-06-17T17:32:36Z","symbol":"NIM1468099","token_address":"0xaf4fe9c4f6c9105c1192b86248b0ca440d2a463b","type":"artist","uuid":"94b5c45e-502f-4d0f-80ac-c0f879cfb031"}
album: Jennie. 1989. West 4th Street, New York
  type: MusicAlbum
  date published: 2022-01-28
album: The Nothing Lamp
  type: MusicAlbum
  date published: 2022-02-11