Het Noordzee duo
type: MusicGroup
genre: polka
popularity: 4
followers: 126
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xcf6b054cf3dabfa8d744e427ee4e9d023bd480b6d964abed613adb1063565869
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/9ac7008f-755e-4989-8839-8a1b4717226f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9ac7008f-755e-4989-8839-8a1b4717226f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9ac7008f-755e-4989-8839-8a1b4717226f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xcf6b054cf3dabfa8d744e427ee4e9d023bd480b6d964abed613adb1063565869","name":"Het Noordzee duo","registered_at":"2026-06-17T19:56:29Z","symbol":"NIM1498314","token_address":"0xcd876f348228b6679ab7349391bcf7fea69e2810","type":"artist","uuid":"9ac7008f-755e-4989-8839-8a1b4717226f"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6b054cf3dabfa8d744e427ee4e9d023bd480b6d964abed613adb1063565869. 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/9ac7008f-755e-4989-8839-8a1b4717226f.json and https://artists.proofprofile.net/proofs/artist/9ac7008f-755e-4989-8839-8a1b4717226f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0xcf6b054cf3dabfa8d744e427ee4e9d023bd480b6d964abed613adb1063565869","name":"Het Noordzee duo","registered_at":"2026-06-17T19:56:29Z","symbol":"NIM1498314","token_address":"0xcd876f348228b6679ab7349391bcf7fea69e2810","type":"artist","uuid":"9ac7008f-755e-4989-8839-8a1b4717226f"}
album: Ik heb van jou gehouden
  type: MusicAlbum
  date published: 2001
album: Het Sleutelgat
  type: MusicAlbum
  date published: 2001
album: Ik heb van jou gehouden
  type: MusicAlbum
  date published: 2001
album: Die mooie tijd
  type: MusicAlbum
  date published: 2002
album: Die mooie tijd
  type: MusicAlbum
  date published: 2002
album: Het leven kan zo mooi zijn
  type: MusicAlbum
  date published: 2006
album: Het leven kan zo mooi zijn
  type: MusicAlbum
  date published: 2006