Holger Kass
type: MusicGroup
popularity: 4
followers: 5
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb43f1ddc9ab5eb5a27d3fa88046521c76e8cb02fae3556d93a24ced46a29faf0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954587
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954587
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b8c68290-a98d-4d88-b6c5-3284b5e1ac14.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b8c68290-a98d-4d88-b6c5-3284b5e1ac14.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b8c68290-a98d-4d88-b6c5-3284b5e1ac14
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T19:10:41Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb43f1ddc9ab5eb5a27d3fa88046521c76e8cb02fae3556d93a24ced46a29faf0","name":"Holger Kass","registered_at":"2026-06-20T16:13:45Z","symbol":"NIM1650598","token_address":"0xd9d9d455194ad3c419b822cac117069c2179b9ef","type":"artist","uuid":"b8c68290-a98d-4d88-b6c5-3284b5e1ac14"}
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 0xb43f1ddc9ab5eb5a27d3fa88046521c76e8cb02fae3556d93a24ced46a29faf0. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8c68290-a98d-4d88-b6c5-3284b5e1ac14.json and https://artists.proofprofile.net/proofs/artist/b8c68290-a98d-4d88-b6c5-3284b5e1ac14.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T19:10:41Z
  text: {"copyright_id":"0xb43f1ddc9ab5eb5a27d3fa88046521c76e8cb02fae3556d93a24ced46a29faf0","name":"Holger Kass","registered_at":"2026-06-20T16:13:45Z","symbol":"NIM1650598","token_address":"0xd9d9d455194ad3c419b822cac117069c2179b9ef","type":"artist","uuid":"b8c68290-a98d-4d88-b6c5-3284b5e1ac14"}
album: Alles reine Kopfsache [5 Phänomene aus der Hirnforschung, mit denen Sie alles schaffen, was Sie wollen! (Ungekürzt)]
  type: MusicAlbum
  date published: 2020-09-25
album: Der Spion in meiner Tasche [Was das Handy mit uns macht und wie wir es trotzdem benutzen können (Ungekürzt)]
  type: MusicAlbum
  date published: 2021-03-05
album: Cashbook [Geldverdienen mit Facebook, Instagram, YouTube und Co. (Ungekürzt)]
  type: MusicAlbum
  date published: 2022-03-25