Gert-Jan & Hanneke Scherff
type: MusicGroup
genre: children's music
popularity: 7
followers: 267
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xad2ea7a3647413bbe3e8999dcb3245e4163125974c0fbf2d870b327ef06d018b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954693
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954693
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e9d5bc4d-c582-419b-be25-42452f5e9768.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e9d5bc4d-c582-419b-be25-42452f5e9768.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e9d5bc4d-c582-419b-be25-42452f5e9768
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T11:50:32Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xad2ea7a3647413bbe3e8999dcb3245e4163125974c0fbf2d870b327ef06d018b","name":"Gert-Jan & Hanneke Scherff","registered_at":"2026-06-21T09:47:36Z","symbol":"NIM1891965","token_address":"0x6dacab8e794b7f0015487bbb26d2762f358e85a2","type":"artist","uuid":"e9d5bc4d-c582-419b-be25-42452f5e9768"}
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 0xad2ea7a3647413bbe3e8999dcb3245e4163125974c0fbf2d870b327ef06d018b. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9d5bc4d-c582-419b-be25-42452f5e9768.json and https://artists.proofprofile.net/proofs/artist/e9d5bc4d-c582-419b-be25-42452f5e9768.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T11:50:32Z
  text: {"copyright_id":"0xad2ea7a3647413bbe3e8999dcb3245e4163125974c0fbf2d870b327ef06d018b","name":"Gert-Jan & Hanneke Scherff","registered_at":"2026-06-21T09:47:36Z","symbol":"NIM1891965","token_address":"0x6dacab8e794b7f0015487bbb26d2762f358e85a2","type":"artist","uuid":"e9d5bc4d-c582-419b-be25-42452f5e9768"}
album: Confetti
  type: MusicAlbum
  date published: 2009
album: Goud!
  type: MusicAlbum
  date published: 2010
album: Surprise
  type: MusicAlbum
  date published: 2015-07-01
album: Popcorn
  type: MusicAlbum
  date published: 2018-02-02
album: Gratis
  type: MusicAlbum
  date published: 2018-02-03
album: Land in zicht
  type: MusicAlbum
  date published: 2020-03-29
album: Windkracht 10
  type: MusicAlbum
  date published: 2022-06-24
  track: Windkracht 10
    type: MusicRecording
    duration: PT3M43S
    duration ms: 223773
    explicit: false
    by artist: Gert-Jan & Hanneke Scherff
    in album: Windkracht 10
      type: MusicAlbum
      date published: 2022-06-24
    genre: children's music
    isrc code: NLL152203701
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-06T00:01:24+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x73de385a853751cad767db313b40bedc4596ee65d322de8abf1784ff30e02bac
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956856
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956856
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLL152203701
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-06T01:25:57Z
    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 0x73de385a853751cad767db313b40bedc4596ee65d322de8abf1784ff30e02bac. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLL152203701.
      date published: 2026-07-06T01:25:57Z
    audio: Windkracht 10
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 137.984
      additional property: Musical Key
        type: PropertyValue
        value: 8
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.657
      additional property: Energy
        type: PropertyValue
        value: 0.675
      additional property: Speechiness
        type: PropertyValue
        value: 0.127
      additional property: Acousticness
        type: PropertyValue
        value: 0.06
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.334
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.497
      additional property: Loudness (dB)
        type: PropertyValue
        value: -11.396
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Kerstparty
  type: MusicAlbum
  date published: 2023-02-15
album: Blauw Bloed
  type: MusicAlbum
  date published: 2024-08-25
album: Onder de loep
  type: MusicAlbum
  date published: 2025-08-09