Callkoen
type: MusicGroup
genre: rocksteady
genre: ska
popularity: 2
followers: 391
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xcf23f294c7f4cc1846cce4f91f2aea94886051fb2e04f065b6598ea8e25bbfc2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954023
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954023
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/37e697b3-386f-4ade-b0eb-3d4924127489.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/37e697b3-386f-4ade-b0eb-3d4924127489.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/37e697b3-386f-4ade-b0eb-3d4924127489
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T23:57:23Z
additional property: OTSCanonicalRecord
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 0xcf23f294c7f4cc1846cce4f91f2aea94886051fb2e04f065b6598ea8e25bbfc2. Chain 2 (Bitcoin): anchored in block 954023 (2026-06-16T23:57:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37e697b3-386f-4ade-b0eb-3d4924127489.json and https://artists.proofprofile.net/proofs/artist/37e697b3-386f-4ade-b0eb-3d4924127489.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T23:57:23Z
album: No Soul
  type: MusicAlbum
  date published: 2019-05-06
album: Zomerfruit
  type: MusicAlbum
  date published: 2019-05-06
album: Wakker
  type: MusicAlbum
  date published: 2019-05-06
album: Serieus
  type: MusicAlbum
  date published: 2019-05-06
album: Legalitijd
  type: MusicAlbum
  date published: 2023-05-26
album: Smonken
  type: MusicAlbum
  date published: 2023-06-18
album: Zomerfruit
  type: MusicAlbum
  date published: 2023-06-23
album: Doe Maar Wat
  type: MusicAlbum
  date published: 2024-05-24