Vermeer Quartet
type: MusicGroup
genre: chamber music
description: The Vermeer Quartet was a string quartet founded in 1969 at the Marlboro Music Festival in Vermont and active until 2007. Background They performed in North and South America, Europe, the Far East, a
popularity: 10
followers: 433
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x53d3c55bdabc1f093f76cfa93d991d8385dab77d23c40e30a4f2fb449b5f29dd
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/693463b7-5365-4ecf-96e9-4d8c3dff54fe.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/693463b7-5365-4ecf-96e9-4d8c3dff54fe.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/693463b7-5365-4ecf-96e9-4d8c3dff54fe
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x53d3c55bdabc1f093f76cfa93d991d8385dab77d23c40e30a4f2fb449b5f29dd","name":"Vermeer Quartet","registered_at":"2026-06-17T02:22:01Z","symbol":"NIM1250946","token_address":"0xc83754809b2e5bafa581a70cc35f06ec6a6a1f81","type":"artist","uuid":"693463b7-5365-4ecf-96e9-4d8c3dff54fe"}
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 0x53d3c55bdabc1f093f76cfa93d991d8385dab77d23c40e30a4f2fb449b5f29dd. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/693463b7-5365-4ecf-96e9-4d8c3dff54fe.json and https://artists.proofprofile.net/proofs/artist/693463b7-5365-4ecf-96e9-4d8c3dff54fe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x53d3c55bdabc1f093f76cfa93d991d8385dab77d23c40e30a4f2fb449b5f29dd","name":"Vermeer Quartet","registered_at":"2026-06-17T02:22:01Z","symbol":"NIM1250946","token_address":"0xc83754809b2e5bafa581a70cc35f06ec6a6a1f81","type":"artist","uuid":"693463b7-5365-4ecf-96e9-4d8c3dff54fe"}
album: Concerts Under The Dome
  type: MusicAlbum
  date published: 1994-03-01
album: Bliss: Oboe Quintet / Britten: Phantasy / String Quartet No. 3
  type: MusicAlbum
  date published: 2006-01-01
album: Bliss: Oboe Quintet / Britten: Phantasy / String Quartet No. 3
  type: MusicAlbum
  date published: 2006-01-01
album: Vermeer Quartet - Death and the Maiden: Schubert, Beethoven, Dvořák, Mendelssohn
  type: MusicAlbum
  date published: 2025-01-30
  track: Schubert: String Quartet No. 14 in D Minor, D. 810 "Death and the Maiden": III. Scherzo. Allegro molto - Trio
    type: MusicRecording
    duration: PT4M6S
    duration ms: 246293
    explicit: false
    by artist: Vermeer Quartet
    in album: Vermeer Quartet - Death and the Maiden: Schubert, Beethoven, Dvořák, Mendelssohn
      type: MusicAlbum
      date published: 2025-01-30
    genre: chamber music
    isrc code: DEA808301903
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T04:15:48+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xca4ae673cf8bd2c11c2319c04e7f8adf1bfb28aab60eda9c8116d19a5c418953
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956772
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956772
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA808301903
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T10:01:46Z
    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 0xca4ae673cf8bd2c11c2319c04e7f8adf1bfb28aab60eda9c8116d19a5c418953. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEA808301903.
      date published: 2026-07-05T10:01:46Z
    audio: Schubert: String Quartet No. 14 in D Minor, D. 810 "Death and the Maiden": III. Scherzo. Allegro molto - Trio
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 125.039
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.492
      additional property: Energy
        type: PropertyValue
        value: 0.057
      additional property: Speechiness
        type: PropertyValue
        value: 0.045
      additional property: Acousticness
        type: PropertyValue
        value: 0.95
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.848
      additional property: Liveness
        type: PropertyValue
        value: 0.092
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.379
      additional property: Loudness (dB)
        type: PropertyValue
        value: -19.645
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Major
  track: Dvořák: String Quartet No. 12 in F Major, Op. 96, B. 179 "American": III. Molto vivace
    type: MusicRecording
    duration: PT4M0S
    duration ms: 240733
    explicit: false
    by artist: Vermeer Quartet
    in album: Vermeer Quartet - Death and the Maiden: Schubert, Beethoven, Dvořák, Mendelssohn
      type: MusicAlbum
      date published: 2025-01-30
    genre: chamber music
    isrc code: DEA802400118
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T12:02:59+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xeb58c7f140ed3d7656612ee26c37fbaac1629b4a62b34694cd42559a1879aa09
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958880
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958880
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA802400118
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T15:04:01Z
    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 0xeb58c7f140ed3d7656612ee26c37fbaac1629b4a62b34694cd42559a1879aa09. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:04:01Z), 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/DEA802400118.
      date published: 2026-07-20T15:04:01Z
    audio: Dvořák: String Quartet No. 12 in F Major, Op. 96, B. 179 "American": III. Molto vivace
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 101.955
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 1
      additional property: Danceability
        type: PropertyValue
        value: 0.411
      additional property: Energy
        type: PropertyValue
        value: 0.07
      additional property: Speechiness
        type: PropertyValue
        value: 0.041
      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name

Acousticness
type: PropertyValue
value: 0.835

Instrumentalness
type: PropertyValue
value: 0.859

Liveness
type: PropertyValue
value: 0.079

Valence (Positivity)
type: PropertyValue
value: 0.39

Loudness (dB)
type: PropertyValue
value: -20.536

Key Name
type: PropertyValue
value: F

Mode Name
type: PropertyValue
value: Major