Stefan de Keijzer
type: MusicGroup
popularity: 6
followers: 101
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6a8ab10882819b4aeb9efc33aba3306e6434c3e3beedc87131c8f273a6469123
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953842
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953842
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/00f8890e-3775-482a-b8f9-bccc0664f018.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/00f8890e-3775-482a-b8f9-bccc0664f018.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/00f8890e-3775-482a-b8f9-bccc0664f018
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T22:22:30Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x6a8ab10882819b4aeb9efc33aba3306e6434c3e3beedc87131c8f273a6469123","name":"Stefan de Keijzer","registered_at":"2026-06-15T13:46:49Z","symbol":"NIM0727053","token_address":"0x5fe22d89e37132b97ece32f7f97254ba5bccd1b6","type":"artist","uuid":"00f8890e-3775-482a-b8f9-bccc0664f018"}
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 0x6a8ab10882819b4aeb9efc33aba3306e6434c3e3beedc87131c8f273a6469123. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00f8890e-3775-482a-b8f9-bccc0664f018.json and https://artists.proofprofile.net/proofs/artist/00f8890e-3775-482a-b8f9-bccc0664f018.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T22:22:30Z
  text: {"copyright_id":"0x6a8ab10882819b4aeb9efc33aba3306e6434c3e3beedc87131c8f273a6469123","name":"Stefan de Keijzer","registered_at":"2026-06-15T13:46:49Z","symbol":"NIM0727053","token_address":"0x5fe22d89e37132b97ece32f7f97254ba5bccd1b6","type":"artist","uuid":"00f8890e-3775-482a-b8f9-bccc0664f018"}
album: De Hele Wereld Mag het Weten
  type: MusicAlbum
  date published: 2023-09-29
album: Zo Ver Weg
  type: MusicAlbum
  date published: 2024-04-26
  track: Zo Ver Weg
    type: MusicRecording
    duration: PT3M7S
    duration ms: 187497
    explicit: false
    by artist: Stefan de Keijzer
    in album: Zo Ver Weg
      type: MusicAlbum
      date published: 2024-04-26
    isrc code: NLG6P2400014
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-04T09:51:20+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xaeec99b25c909b7aa01e2fd99749d53f30635d6679b322259a15162fa96e15b5
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956639
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956639
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLG6P2400014
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-04T11:19:20Z
    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 0xaeec99b25c909b7aa01e2fd99749d53f30635d6679b322259a15162fa96e15b5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLG6P2400014.
      date published: 2026-07-04T11:19:20Z
    audio: Zo Ver Weg
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 136.09
      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: 0.733
      additional property: Energy
        type: PropertyValue
        value: 0.875
      additional property: Speechiness
        type: PropertyValue
        value: 0.047
      additional property: Acousticness
        type: PropertyValue
        value: 0.456
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.057
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.589
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.309
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Proost Op Het Leven
  type: MusicAlbum
  date published: 2024-10-11
album: Geluk Is Niet Te Koop
  type: MusicAlbum
  date published: 2025-05-16