Leonard Maassen
type: MusicGroup
popularity: 6
followers: 504
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb288b657aeb7888c0e83af24735b32fbe6bcd949bc8fdc06cd777752a7694a3e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953911
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953911
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/194cf386-fdd3-4b24-b711-74e96fd32911.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/194cf386-fdd3-4b24-b711-74e96fd32911.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/194cf386-fdd3-4b24-b711-74e96fd32911
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T08:03:10Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb288b657aeb7888c0e83af24735b32fbe6bcd949bc8fdc06cd777752a7694a3e","name":"Leonard Maassen","registered_at":"2026-06-15T22:14:25Z","symbol":"NIM0848155","token_address":"0x3f5005baeea50fcd7dfcdb91f14044c77993e99a","type":"artist","uuid":"194cf386-fdd3-4b24-b711-74e96fd32911"}
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 0xb288b657aeb7888c0e83af24735b32fbe6bcd949bc8fdc06cd777752a7694a3e. Chain 2 (Bitcoin): anchored in block 953911 (2026-06-16T08:03:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/194cf386-fdd3-4b24-b711-74e96fd32911.json and https://artists.proofprofile.net/proofs/artist/194cf386-fdd3-4b24-b711-74e96fd32911.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T08:03:10Z
  text: {"copyright_id":"0xb288b657aeb7888c0e83af24735b32fbe6bcd949bc8fdc06cd777752a7694a3e","name":"Leonard Maassen","registered_at":"2026-06-15T22:14:25Z","symbol":"NIM0848155","token_address":"0x3f5005baeea50fcd7dfcdb91f14044c77993e99a","type":"artist","uuid":"194cf386-fdd3-4b24-b711-74e96fd32911"}
album: Knote Strasse
  type: MusicAlbum
  date published: 2021-03-12
  track: Knote Strasse
    type: MusicRecording
    duration: PT5M3S
    duration ms: 303294
    explicit: false
    by artist: Leonard Maassen
    in album: Knote Strasse
      type: MusicAlbum
      date published: 2021-03-12
    isrc code: DEZC62175874
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-04T23:47:55+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xe8db29472051a88b1ec35479e42766c7ea32a744056521a332f1bd040f36860e
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956725
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956725
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZC62175874
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T01:12:41Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8db29472051a88b1ec35479e42766c7ea32a744056521a332f1bd040f36860e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZC62175874.
      date published: 2026-07-05T01:12:41Z
    audio: Knote Strasse
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 130.015
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.759
      additional property: Energy
        type: PropertyValue
        value: 0.371
      additional property: Speechiness
        type: PropertyValue
        value: 0.065
      additional property: Acousticness
        type: PropertyValue
        value: 0.035
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.8
      additional property: Liveness
        type: PropertyValue
        value: 0.152
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.178
      additional property: Loudness (dB)
        type: PropertyValue
        value: -12.579
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: El Amor
  type: MusicAlbum
  date published: 2021-04-02
album: Kukicha
  type: MusicAlbum
  date published: 2021-04-23
album: Lillies EP
  type: MusicAlbum
  date published: 2021-05-14
album: Colours
  type: MusicAlbum
  date published: 2024-02-16
album: Take Me To Space
  type: MusicAlbum
  date published: 2024-03-22
album: Inside Cycles
  type: MusicAlbum
  date published: 2024-04-26
album: last time when we spoke on the phone
  type: MusicAlbum
  date published: 2025-03-14