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genre: chamber music
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  track: Clarinet Quintet in A Major, K. 581: I. Allegro
  track: Clarinet Quintet in A Major, K. 581: II. Larghetto
  track: Clarinet Quintet in A Major, K. 581: III. Menuetto - Trio I - Trio II
  track: Clarinet Quintet in A Major, K. 581: IV. Allegretto con variazioni
  track: String Quartet No.15 in D Minor, K. 421: I. Allegro moderato
  track: String Quartet No.15 in D Minor, K. 421: II. Andante
  track: String Quartet No.15 in D Minor, K. 421: III. Menuetto - Trio (Allegretto)
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album: Schubert: String Quintet, Op. 163
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album: Ravel & Debussy: String Quartets
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  track: Piano Quintet in F Minor, Op. 34: II. Andante, un poco adagio
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Clarinet Quintet in A Major, K. 581: I. Allegro
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popularity: 20
genre: classical
genre: classical-era
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  date published: 2026-06-13T15:41:10Z
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Clarinet Quintet in A Major, K. 581: II. Larghetto
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  date published: 2026-06-13T13:32:09Z
audio: Clarinet Quintet in A Major, K. 581: II. Larghetto
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Clarinet Quintet in A Major, K. 581: III. Menuetto - Trio I - Trio II
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popularity: 14
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  date published: 2026-07-02T03:30:09Z
audio: Clarinet Quintet in A Major, K. 581: III. Menuetto - Trio I - Trio II
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Clarinet Quintet in A Major, K. 581: IV. Allegretto con variazioni
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popularity: 14
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additional property: OTSVerifyInstructions
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  date published: 2026-07-02T03:30:09Z
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String Quartet No.15 in D Minor, K. 421: I. Allegro moderato
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  date published: 2026-07-02T03:30:09Z
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String Quartet No.15 in D Minor, K. 421: II. Andante
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by artist: Arcanto Quartett
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genre: classical-era
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additional property: OTSVerifyInstructions
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  date published: 2026-07-02T11:34:59Z
audio: String Quartet No.15 in D Minor, K. 421: II. Andante
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String Quartet No.15 in D Minor, K. 421: III. Menuetto - Trio (Allegretto)
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by artist: Arcanto Quartett
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additional property: OTSVerifyInstructions
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  date published: 2026-07-02T05:09:12Z
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String Quartet No.15 in D Minor, K. 421: IV. Allegretto ma non troppo
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by artist: Arcanto Quartett
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popularity: 8
genre: classical
genre: classical-era
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T05:09:12Z
audio: String Quartet No.15 in D Minor, K. 421: IV. Allegretto ma non troppo
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String Quintet in C Major, Op. 163 D. 956: II. Adagio
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by artist: Olivier Marron
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genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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  date published: 2026-07-08T03:53:27Z
audio: String Quintet in C Major, Op. 163 D. 956: II. Adagio
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String Quintet in C Major, Op. 163 D. 956: I. Allegro ma non troppo
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duration: PT19M27S
duration ms: 1167653
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by artist: Arcanto Quartett
by artist: Olivier Marron
in album: Schubert: String Quintet, Op. 163
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genre: classical
genre: classical-piano
genre: chamber-music
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  date published: 2026-08-01T00:10:46Z
audio: String Quintet in C Major, Op. 163 D. 956: I. Allegro ma non troppo
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additional property: OTSVerifyInstructions
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  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

String Quartet No. 1 in C Minor, Op. 51: Two String Quartets, Op. 51, String Quartet No. 1 in C Minor: I. Allegro
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genre: classical
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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  date published: 2026-07-08T03:20:19Z
audio: String Quartet No. 1 in C Minor, Op. 51: Two String Quartets, Op. 51, String Quartet No. 1 in C Minor: I. Allegro
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Piano Quintet in F Minor, Op. 34: II. Andante, un poco adagio
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duration: PT8M28S
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genre: classical
genre: german-romanticism
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140732060
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19+00:00
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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 957118
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-08T03:20:19+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05254fb2c36c340570faa3abaa09ae53576014dd6a137066f1f8821ca2995f6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FRZ140732060.
  date published: 2026-07-08T03:53:27Z
audio: Piano Quintet in F Minor, Op. 34: II. Andante, un poco adagio
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    value: 114.398
  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
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  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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    value: -25.578
  additional property: Key Name
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    value: Ab
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    type: PropertyValue
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