Johan de Leur
type: MusicGroup
popularity: 11
followers: 183
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xac5100c85b16cdfb063f6daa834051b30b8deb260f0b2c0a234b9fa3876a8af9
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953618
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953618
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1ca94bfd-7d9d-4b7e-989b-b9790897eda1.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1ca94bfd-7d9d-4b7e-989b-b9790897eda1.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1ca94bfd-7d9d-4b7e-989b-b9790897eda1
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T09:16:10Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xac5100c85b16cdfb063f6daa834051b30b8deb260f0b2c0a234b9fa3876a8af9","name":"Johan de Leur","registered_at":"2026-06-14T07:29:29Z","symbol":"NIM0381708","token_address":"0xd6c9599f7c5ac9b98791994f5fd2dddc51cddd02","type":"artist","uuid":"1ca94bfd-7d9d-4b7e-989b-b9790897eda1"}
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 0xac5100c85b16cdfb063f6daa834051b30b8deb260f0b2c0a234b9fa3876a8af9. Chain 2 (Bitcoin): anchored in block 953618 (2026-06-14T09:16:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ca94bfd-7d9d-4b7e-989b-b9790897eda1.json and https://artists.proofprofile.net/proofs/artist/1ca94bfd-7d9d-4b7e-989b-b9790897eda1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T09:16:10Z
  text: {"copyright_id":"0xac5100c85b16cdfb063f6daa834051b30b8deb260f0b2c0a234b9fa3876a8af9","name":"Johan de Leur","registered_at":"2026-06-14T07:29:29Z","symbol":"NIM0381708","token_address":"0xd6c9599f7c5ac9b98791994f5fd2dddc51cddd02","type":"artist","uuid":"1ca94bfd-7d9d-4b7e-989b-b9790897eda1"}
album: Ik Wil Mijn Stad Terug
  type: MusicAlbum
  date published: 2017-02-23
album: Wat Niet Weet, Wat Niet Deert
  type: MusicAlbum
  date published: 2020-02-16
  track: Wat Niet Weet, Wat Niet Deert
    type: MusicRecording
    duration: PT3M26S
    duration ms: 206242
    explicit: false
    by artist: Johan de Leur
    in album: Wat Niet Weet, Wat Niet Deert
      type: MusicAlbum
      date published: 2020-02-16
    isrc code: NLW6N1700035
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T01:43:50+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x1f3cb8fb022a646f74c94e539e1dcfe209e75ab9b1ab8838e083cce381fcbc40
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958805
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958805
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLW6N1700035
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T02:22:58Z
    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 0x1f3cb8fb022a646f74c94e539e1dcfe209e75ab9b1ab8838e083cce381fcbc40. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/NLW6N1700035.
      date published: 2026-07-20T02:22:58Z
    audio: Wat Niet Weet, Wat Niet Deert
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 137.962
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.855
      additional property: Energy
        type: PropertyValue
        value: 0.715
      additional property: Speechiness
        type: PropertyValue
        value: 0.039
      additional property: Acousticness
        type: PropertyValue
        value: 0.108
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.063
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.962
      additional property: Loudness (dB)
        type: PropertyValue
        value: -7.386
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Wanneer Een Amsterdammer Vrolijk Is En Zingt
  type: MusicAlbum
  date published: 2021-01-26
album: Ik wil mijn stad terug
  type: MusicAlbum
  date published: 2021-12-14
album: Snoepie
  type: MusicAlbum
  date published: 2023-11-17
album: Snoepie
  type: MusicAlbum
  date published: 2023-11-17