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album: Hindemith: Quartet for Clarinet, Violin, Cello and Piano & Shostakovich: Piano Quintet in G Minor, Op. 57
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album: Spohr: Nonet in F Major, Op. 31 - Coker: Concertino for Bassoon and String Trio, Op. 31 - Barber: Summer Music, Op. 31 - Coker: Concertino (2022 Remastered Version)
  type: MusicAlbum
  date published: 2022-08-26
album: Brahms & Dvorák: Serenades
  type: MusicAlbum
  date published: 2016-06-14
album: Profanes Et Sacrées: 20th Century French Chamber Music
  type: MusicAlbum
  date published: 2011-11-01
album: Plain Song, Fantastic Dances: Chamber Music by American Composers
  type: MusicAlbum
  date published: 2011-01-19
album: Mozart Chamber Music for Winds and Strings
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      date published: 2026-07-30T01:32:48Z
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  track: Clarinet Quintet in A Major, K. 581: III. Menuetto
  track: Clarinet Quintet in A Major, K. 581: IV. Allegretto con variazioni
  track: Horn Quintet in E Flat Major, K. 407: I. Allegro
  track: Horn Quintet in E Flat Major, K. 407: II. Andante
  track: Horn Quintet in E Flat Major, K. 407: III. Rondo - Allegro
  track: Oboe Quartet in F Major, K. 370/ 368b: I. Allegro
  track: Oboe Quartet in F Major, K. 370/ 368b: II. Adagio
  track: Oboe Quartet in F Major, K. 370/ 368b: III. Rondeau - Allegro
  track: Flute Quartet in A Major, K. 298: I. Theme (Andante) and Variations
  track: Flute Quartet in A Major, K. 298: II. Menuetto
  track: Flute Quartet in A Major, K. 298: III. Rondeau - Allegretto grazioso
album: Schubert: Piano Trio, Op. 99 - Milhaud: Pastorale - Hindemith: Kleine Kammermusik, Op. 24, No. 2 (2022 Remastered Version)
album: The Boston Symphony Chamber Players Play Schubert, Brahms, Poulenc, Webern and Martinu (2022 Remastered Version)
album: The Boston Symphony Chamber Players Play Mozart, Brahms, Beethoven, Fine, Copland and Carter (2022 Remastered Version)
album: The Boston Symphony Chamber Players Play Mozart, Brahms, Schubert, Poulenc, Cograss, Villa-Lobos and Haieff (2022 Remastered Version)
album: Chamber Music Discussions with Peter Ustinov, Erich Leinsdorf and Joseph Silverstein (2022 Remastered Version)

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Clarinet Quintet in A Major, K. 581: III. Menuetto
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  date published: 2026-07-07T16:07:00Z
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
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Horn Quintet in E Flat Major, K. 407: I. Allegro
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  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Horn Quintet in E Flat Major, K. 407: II. Andante
type: MusicRecording
duration: PT6M27S
duration ms: 387733
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: The Boston Symphony Chamber Players
in album: Mozart Chamber Music for Winds and Strings
  type: MusicAlbum
  date published: 2007-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: USZXG0600606
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T03:29:29+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2fd29a6f8a6f73880ed83a1bbaa2a062085d91110d404bb9820c30202f575d5b
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/USZXG0600606
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 0x2fd29a6f8a6f73880ed83a1bbaa2a062085d91110d404bb9820c30202f575d5b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600606 — a six-check JSON result.
  date published: 2026-07-31T04:14:58Z
audio: Horn Quintet in E Flat Major, K. 407: II. Andante
  type: AudioObject
  additional property: Tempo (BPM)
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    value: 102.218
  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
    type: PropertyValue
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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)
    type: PropertyValue
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  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Horn Quintet in E Flat Major, K. 407: III. Rondo - Allegro
type: MusicRecording
duration: PT3M46S
duration ms: 226826
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: The Boston Symphony Chamber Players
in album: Mozart Chamber Music for Winds and Strings
  type: MusicAlbum
  date published: 2007-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: USZXG0600607
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T05:26:41+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3bff07bc75c72dfe75e8af7e0f28f276925c8600b773a894f5f79601066f03d8
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 960354
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960354
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600607
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T05:48:18Z
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 0x3bff07bc75c72dfe75e8af7e0f28f276925c8600b773a894f5f79601066f03d8. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600607 — a six-check JSON result.
  date published: 2026-07-31T05:48:18Z
audio: Horn Quintet in E Flat Major, K. 407: III. Rondo - Allegro
  type: AudioObject
  additional property: Tempo (BPM)
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    value: 136.095
  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
    value: 0.04
  additional property: Acousticness
    type: PropertyValue
    value: 0.993
  additional property: Instrumentalness
    type: PropertyValue
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  additional property: Liveness
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  additional property: Valence (Positivity)
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    value: 0.506
  additional property: Loudness (dB)
    type: PropertyValue
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  additional property: Key Name
    type: PropertyValue
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  additional property: Mode Name
    type: PropertyValue
    value: Major

Oboe Quartet in F Major, K. 370/ 368b: I. Allegro
type: MusicRecording
duration: PT7M3S
duration ms: 423853
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: The Boston Symphony Chamber Players
in album: Mozart Chamber Music for Winds and Strings
  type: MusicAlbum
  date published: 2007-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: USZXG0600608
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T04:57:03+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9ef2a139a91690b23067187e6aa660b1696b8629491f6c8fe42bd56c789ce117
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957118
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957118
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600608
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19Z
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 0x9ef2a139a91690b23067187e6aa660b1696b8629491f6c8fe42bd56c789ce117. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600608 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Oboe Quartet in F Major, K. 370/ 368b: I. Allegro
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 109.471
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.337
  additional property: Energy
    type: PropertyValue
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  additional property: Speechiness
    type: PropertyValue
    value: 0.054
  additional property: Acousticness
    type: PropertyValue
    value: 0.948
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.82
  additional property: Liveness
    type: PropertyValue
    value: 0.169
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.578
  additional property: Loudness (dB)
    type: PropertyValue
    value: -22.8
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Major

Oboe Quartet in F Major, K. 370/ 368b: II. Adagio
type: MusicRecording
duration: PT2M55S
duration ms: 175533
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: The Boston Symphony Chamber Players
in album: Mozart Chamber Music for Winds and Strings
  type: MusicAlbum
  date published: 2007-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: USZXG0600609
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T05:45:18+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x1278f200ef97374c4ff0e7e60a22dadca74a35315e4e26d09a3826e519666ff0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956889
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956889
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600609
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-06T06:56:49Z
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 0x1278f200ef97374c4ff0e7e60a22dadca74a35315e4e26d09a3826e519666ff0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600609 — a six-check JSON result.
  date published: 2026-07-06T06:56:49Z
audio: Oboe Quartet in F Major, K. 370/ 368b: II. Adagio
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 107.075
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.269
  additional property: Energy
    type: PropertyValue
    value: 0.057
  additional property: Speechiness
    type: PropertyValue
    value: 0.045
  additional property: Acousticness
    type: PropertyValue
    value: 0.962
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.876
  additional property: Liveness
    type: PropertyValue
    value: 0.354
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.09
  additional property: Loudness (dB)
    type: PropertyValue
    value: -25.33
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Oboe Quartet in F Major, K. 370/ 368b: III. Rondeau - Allegro
type: MusicRecording
duration: PT4M32S
duration ms: 272226
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: The Boston Symphony Chamber Players
in album: Mozart Chamber Music for Winds and Strings
  type: MusicAlbum
  date published: 2007-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: USZXG0600610
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T01:53:41+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6d7b0d9778022499abd1d1f0a6b584719417d710b6ba2e69c01014385c6b1bb5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960334
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960334
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600610
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T02:19:15Z
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 0x6d7b0d9778022499abd1d1f0a6b584719417d710b6ba2e69c01014385c6b1bb5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600610 — a six-check JSON result.
  date published: 2026-07-31T02:19:15Z
audio: Oboe Quartet in F Major, K. 370/ 368b: III. Rondeau - Allegro
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 93.302
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.343
  additional property: Energy
    type: PropertyValue
    value: 0.097
  additional property: Speechiness
    type: PropertyValue
    value: 0.054
  additional property: Acousticness
    type: PropertyValue
    value: 0.951
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.913
  additional property: Liveness
    type: PropertyValue
    value: 0.109
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.605
  additional property: Loudness (dB)
    type: PropertyValue
    value: -23.138
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Major

Flute Quartet in A Major, K. 298: I. Theme (Andante) and Variations
type: MusicRecording
duration: PT6M28S
duration ms: 388893
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: The Boston Symphony Chamber Players
in album: Mozart Chamber Music for Winds and Strings
  type: MusicAlbum
  date published: 2007-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: USZXG0600611
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-27T09:40:14+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0bd6c4a090e5e85327cad02e955f15a53f4f3c648639ce9e7fcd07bfc11a2ae4
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600611
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
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 0x0bd6c4a090e5e85327cad02e955f15a53f4f3c648639ce9e7fcd07bfc11a2ae4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600611 — a six-check JSON result.
  date published: 2026-07-02T03:55:08Z
audio: Flute Quartet in A Major, K. 298: I. Theme (Andante) and Variations
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 165.992
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.197
  additional property: Energy
    type: PropertyValue
    value: 0.087
  additional property: Speechiness
    type: PropertyValue
    value: 0.047
  additional property: Acousticness
    type: PropertyValue
    value: 0.981
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.549
  additional property: Liveness
    type: PropertyValue
    value: 0.089
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.385
  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.667
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Major

Flute Quartet in A Major, K. 298: II. Menuetto
type: MusicRecording
duration: PT2M25S
duration ms: 145640
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: The Boston Symphony Chamber Players
in album: Mozart Chamber Music for Winds and Strings
  type: MusicAlbum
  date published: 2007-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: USZXG0600612
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T18:33:24+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x94f928a2c7848d2fa6d4b7bbecf1b522c218adaae01d84e69997298fe2e72c32
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957120
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957120
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZXG0600612
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:22:41Z
additional property: OTSVerifyInstructions
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Flute Quartet in A Major, K. 298: III. Rondeau - Allegretto grazioso
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Schubert: Piano Trio, Op. 99 - Milhaud: Pastorale - Hindemith: Kleine Kammermusik, Op. 24, No. 2 (2022 Remastered Version)
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date published: 1970-08-01

The Boston Symphony Chamber Players Play Schubert, Brahms, Poulenc, Webern and Martinu (2022 Remastered Version)
type: MusicAlbum
date published: 1969-08-01

The Boston Symphony Chamber Players Play Mozart, Brahms, Beethoven, Fine, Copland and Carter (2022 Remastered Version)
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date published: 1966-09-01

The Boston Symphony Chamber Players Play Mozart, Brahms, Schubert, Poulenc, Cograss, Villa-Lobos and Haieff (2022 Remastered Version)
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date published: 1966-08-01

Chamber Music Discussions with Peter Ustinov, Erich Leinsdorf and Joseph Silverstein (2022 Remastered Version)
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date published: 1966