Amstel Quartet
type: MusicGroup
genre: minimalism
popularity: 14
followers: 1639
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3a0d87c93f435baa9130fb9675dcecc739a8db246bd3a949685583f0edb65362
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953817
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953817
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/faed1fb5-2cd2-4dbf-a9de-c7a08f2ea515.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/faed1fb5-2cd2-4dbf-a9de-c7a08f2ea515.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/faed1fb5-2cd2-4dbf-a9de-c7a08f2ea515
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T18:10:31Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x3a0d87c93f435baa9130fb9675dcecc739a8db246bd3a949685583f0edb65362","name":"Amstel Quartet","registered_at":"2026-06-15T06:55:11Z","symbol":"NIM0717134","token_address":"0x16e4946c3057ce9229d156677918217ded45d0a7","type":"artist","uuid":"faed1fb5-2cd2-4dbf-a9de-c7a08f2ea515"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0d87c93f435baa9130fb9675dcecc739a8db246bd3a949685583f0edb65362. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/faed1fb5-2cd2-4dbf-a9de-c7a08f2ea515.json and https://artists.proofprofile.net/proofs/artist/faed1fb5-2cd2-4dbf-a9de-c7a08f2ea515.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T18:10:31Z
  text: {"copyright_id":"0x3a0d87c93f435baa9130fb9675dcecc739a8db246bd3a949685583f0edb65362","name":"Amstel Quartet","registered_at":"2026-06-15T06:55:11Z","symbol":"NIM0717134","token_address":"0x16e4946c3057ce9229d156677918217ded45d0a7","type":"artist","uuid":"faed1fb5-2cd2-4dbf-a9de-c7a08f2ea515"}
album: Dufourt: Les courants polyphoniques d'après Klee (Live at the Waalse Kerk, Amsterdam, December 7th 2019)
  type: MusicAlbum
  date published: 2021-01-29
album: American Dream
  type: MusicAlbum
  date published: 2020-11-03
  track: May
    type: MusicRecording
    duration: PT7M43S
    duration ms: 463506
    explicit: false
    by artist: Michael Torke
    by artist: Amstel Quartet
    in album: American Dream
      type: MusicAlbum
      date published: 2020-11-03
    popularity: 2
    genre: minimalism
    isrc code: NLSB72000258
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-31T03:40:30+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xd28b1fb6e121a86eadf9ac4216535632cdf305f524878712ef8010e9390051c5
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960344
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960344
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSB72000258
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-31T04:14:58Z
    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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28b1fb6e121a86eadf9ac4216535632cdf305f524878712ef8010e9390051c5. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLSB72000258.
      date published: 2026-07-31T04:14:58Z
    audio: May
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 118.112
      additional property: Musical Key
        type: PropertyValue
        value: 8
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.508
      additional property: Energy
        type: PropertyValue
        value: 0.184
      additional property: Speechiness
        type: PropertyValue
        value: 0.04
      additional property: Acousticness
        type: PropertyValue
        value: 0.993
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.904
      additional property: Liveness
        type: PropertyValue
        value: 0.095
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.434
      additional property: Loudness (dB)
        type: PropertyValue
        value: -20.202
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
        type: PropertyValue
        value: Major