Mark J
type: MusicGroup
popularity: 9
followers: 52
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x4a7909a91f72ff1ee6bec1dc38b3ce7fd8613feb59773160f06fbb249ad1c634
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/a735dbc5-c00b-4bbd-8553-a922dae8e048.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a735dbc5-c00b-4bbd-8553-a922dae8e048.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a735dbc5-c00b-4bbd-8553-a922dae8e048
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T08:57:02Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x4a7909a91f72ff1ee6bec1dc38b3ce7fd8613feb59773160f06fbb249ad1c634","name":"Mark J","registered_at":"2026-06-20T08:18:03Z","symbol":"NIM1563058","token_address":"0x222228b2a9df441208a8a22679aaafd5fbf91d10","type":"artist","uuid":"a735dbc5-c00b-4bbd-8553-a922dae8e048"}
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 0x4a7909a91f72ff1ee6bec1dc38b3ce7fd8613feb59773160f06fbb249ad1c634. 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/a735dbc5-c00b-4bbd-8553-a922dae8e048.json and https://artists.proofprofile.net/proofs/artist/a735dbc5-c00b-4bbd-8553-a922dae8e048.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T08:57:02Z
  text: {"copyright_id":"0x4a7909a91f72ff1ee6bec1dc38b3ce7fd8613feb59773160f06fbb249ad1c634","name":"Mark J","registered_at":"2026-06-20T08:18:03Z","symbol":"NIM1563058","token_address":"0x222228b2a9df441208a8a22679aaafd5fbf91d10","type":"artist","uuid":"a735dbc5-c00b-4bbd-8553-a922dae8e048"}
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  type: MusicAlbum
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  type: MusicAlbum
  date published: 2015-07-13
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  date published: 2020-11-09