Femke Vernij
type: MusicGroup
genre: nederpop
popularity: 8
followers: 226
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdfa8036dc9408e0bbfaf54f8eac00d885ca2b60a6ab4bdbd1807390e24982715
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954728
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954728
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f7fb03b6-ae5a-4b70-8d97-c26a97be6ecd.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f7fb03b6-ae5a-4b70-8d97-c26a97be6ecd.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/f7fb03b6-ae5a-4b70-8d97-c26a97be6ecd
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T18:08:38Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdfa8036dc9408e0bbfaf54f8eac00d885ca2b60a6ab4bdbd1807390e24982715","name":"Femke Vernij","registered_at":"2026-06-21T16:05:33Z","symbol":"NIM1967141","token_address":"0xb7eaf1d21217d06edc0f977161a074ce448878b1","type":"artist","uuid":"f7fb03b6-ae5a-4b70-8d97-c26a97be6ecd"}
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 0xdfa8036dc9408e0bbfaf54f8eac00d885ca2b60a6ab4bdbd1807390e24982715. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7fb03b6-ae5a-4b70-8d97-c26a97be6ecd.json and https://artists.proofprofile.net/proofs/artist/f7fb03b6-ae5a-4b70-8d97-c26a97be6ecd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T18:08:38Z
  text: {"copyright_id":"0xdfa8036dc9408e0bbfaf54f8eac00d885ca2b60a6ab4bdbd1807390e24982715","name":"Femke Vernij","registered_at":"2026-06-21T16:05:33Z","symbol":"NIM1967141","token_address":"0xb7eaf1d21217d06edc0f977161a074ce448878b1","type":"artist","uuid":"f7fb03b6-ae5a-4b70-8d97-c26a97be6ecd"}
album: Kortebroekendag
  type: MusicAlbum
  date published: 2022-10-28
album: Kledingkast
  type: MusicAlbum
  date published: 2023-01-13
album: Ikea
  type: MusicAlbum
  date published: 2024-09-10
album: Holiday
  type: MusicAlbum
  date published: 2024-09-20
album: Oma in de Sterren
  type: MusicAlbum
  date published: 2024-10-17
album: Mannengriep
  type: MusicAlbum
  date published: 2025-02-15
  track: Mannengriep
    type: MusicRecording
    duration: PT3M20S
    duration ms: 200913
    explicit: false
    by artist: Femke Vernij
    in album: Mannengriep
      type: MusicAlbum
      date published: 2025-02-15
    genre: nederpop
    isrc code: QZES62580235
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T17:11:57+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x32cb3ab24cd67480903e144936b261ff2a8165ae8d541a6aad1ec771fa1453cd
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958180
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958180
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES62580235
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T20:10:26Z
    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 0x32cb3ab24cd67480903e144936b261ff2a8165ae8d541a6aad1ec771fa1453cd. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:10:26Z), 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/QZES62580235.
      date published: 2026-07-15T20:10:26Z
    audio: Mannengriep
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 179.848
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.605
      additional property: Energy
        type: PropertyValue
        value: 0.623
      additional property: Speechiness
        type: PropertyValue
        value: 0.163
      additional property: Acousticness
        type: PropertyValue
        value: 0.744
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.102
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.424
      additional property: Loudness (dB)
        type: PropertyValue
        value: -7.285
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Arnhem aan Zee (Extended)
  type: MusicAlbum
  date published: 2025-03-14