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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-08T03:22:41Z
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      date published: 2026-07-02T03:55:08Z
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  track: Brahms: Clarinet Quintet in B Minor, Op. 115: III. Andantino
  track: Brahms: Clarinet Quintet in B Minor, Op. 115: IV. Con moto
  track: Brahms: String Quintet No. 2 in G Major, Op. 111: I. Allegro non troppo, ma con brio
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album: Lefevre: Clarinet Quartets Nos. 1-4
album: Gubaidulina: Repentance
album: Haydn: Die sieben letzten Worte unseres Erlösers am Kreuze - Mozart: Quartett KV 370
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album: Marx: Works for Piano Quartet
album: Schumann: Piano Quartets
album: Stamitz, C.: Viola Concerto, Op. 1 / Hoffmeister, F.A.: Viola Concerto in D Major / Zelter, C.F.: Viola Concerto in E-Flat Major
album: Mozart: Flute Quartets Nos. 1 - 4
album: Mendelssohn: Trio for Violin, Viola and Piano - Sonatas for Viola and Clarinet
album: 100 Best Chamber Music
album: Festliches Osterkonzert 2024
album: Work - Schumann
album: Ostern Kirchenmusik
album: Discovery of a Romanticist, Vol. 1
album: Mozart: Das Beste - Klassik die man gehört muss
album: The Complete Warner Classics Recordings
album: Sleeping - Schumann
album: Die Playlist für Ostern: klassisch & festlich
album: Mozart: Die beste Playlist
album: Mozart zu Ostern
album: Mozart zum Träumen und Entspannen
album: Kiel: Piano Quartets Nos. 1-3
album: Juon, P.: Piano Quartets Nos. 1 and 2
album: Mozart zum Muttertag
album: Schumann: Chamber Music, Vol. 3
album: December Strings
album: Hintergrundmusik zum gemütlichen Osterfrühstück
album: Schelb: Chamber Music

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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T11:07:37Z
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subject of: OpenTimestamps Proof of Existence
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Brahms: String Quintet No. 2 in G Major, Op. 111: I. Allegro non troppo, ma con brio
type: MusicRecording
duration: PT12M42S
duration ms: 762026
explicit: false
by artist: Johannes Brahms
by artist: Alban Berg Quartett
by artist: Hariolf Schlichtig
in album: Brahms: Klarinettenquintett, Op. 115 & Streichquintett Nr. 2, Op. 111
  type: MusicAlbum
  date published: 1999-01-01
genre: classical
genre: german-romanticism
genre: classical-piano
genre: late-romantic-era
genre: chamber-music
genre: orchestral
isrc code: GBAYC9802557
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: OTSHash
additional property: OTSBitcoinBlock
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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
  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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c8248d095638b08677f25b26c0f9aac1fc64c271b688289f84ab745555ff54. 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/GBAYC9802557 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Brahms: String Quintet No. 2 in G Major, Op. 111: I. Allegro non troppo, ma con brio
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Brahms: String Quintet No. 2 in G Major, Op. 111: II. Adagio
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duration: PT7M1S
duration ms: 421133
explicit: false
by artist: Johannes Brahms
by artist: Alban Berg Quartett
by artist: Hariolf Schlichtig
in album: Brahms: Klarinettenquintett, Op. 115 & Streichquintett Nr. 2, Op. 111
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  date published: 1999-01-01
genre: classical
genre: german-romanticism
genre: classical-piano
genre: late-romantic-era
genre: chamber-music
genre: orchestral
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additional property: CopyrightID
additional property: CopyrightStatus
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additional property: OTSBitcoinBlock
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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 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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6109c21582466cf0977b7139123cfd526850951f15fbf5826d2944339c6b141. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBAYC9802558 — a six-check JSON result.
  date published: 2026-07-30T14:36:16Z
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Brahms: String Quintet No. 2 in G Major, Op. 111: III. Un poco Allegretto
type: MusicRecording
duration: PT5M21S
duration ms: 321973
explicit: false
by artist: Johannes Brahms
by artist: Alban Berg Quartett
by artist: Hariolf Schlichtig
in album: Brahms: Klarinettenquintett, Op. 115 & Streichquintett Nr. 2, Op. 111
  type: MusicAlbum
  date published: 1999-01-01
genre: classical
genre: german-romanticism
genre: classical-piano
genre: late-romantic-era
genre: chamber-music
genre: orchestral
isrc code: GBAYC9802559
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9802559
additional property: OTSTimestamp
  type: PropertyValue
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd9ef893cec5bbbb5f09f78996de80cb1f0623664855162b3949443f5afd59a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBAYC9802559 — a six-check JSON result.
  date published: 2026-07-30T15:42:38Z
audio: Brahms: String Quintet No. 2 in G Major, Op. 111: III. Un poco Allegretto
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Brahms: String Quintet No. 2 in G Major, Op. 111: IV. Vivace ma non troppo presto
type: MusicRecording
duration: PT5M29S
duration ms: 329826
explicit: false
by artist: Johannes Brahms
by artist: Alban Berg Quartett
by artist: Hariolf Schlichtig
in album: Brahms: Klarinettenquintett, Op. 115 & Streichquintett Nr. 2, Op. 111
  type: MusicAlbum
  date published: 1999-01-01
genre: classical
genre: german-romanticism
genre: classical-piano
genre: late-romantic-era
genre: chamber-music
genre: orchestral
isrc code: GBAYC9802560
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9802560
additional property: OTSTimestamp
  type: PropertyValue
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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 0x166cc14ea1bf39aace69570658b4d33160dbfd12e3531b9266510b7e38d44245. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBAYC9802560 — a six-check JSON result.
  date published: 2026-07-30T21:35:24Z
audio: Brahms: String Quintet No. 2 in G Major, Op. 111: IV. Vivace ma non troppo presto
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Lefèvre: Clarinet Quartets and Sonatas
type: MusicAlbum
date published: 2010-11-16

Lefevre: Clarinet Quartets Nos. 1-4
type: MusicAlbum
date published: 2009-07-28

Gubaidulina: Repentance
type: MusicAlbum
date published: 2014-08-05
track: Repentance
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  by artist: Sofia Gubaidulina
  by artist: Wen-Sinn Yang
  by artist: Franz Halász
  by artist: Jacob Kellermann
  by artist: Lucas Brar
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    type: MusicAlbum
    date published: 2014-08-05
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEV1456010
  additional property: OTSTimestamp
    type: PropertyValue
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  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 0x1b04e0419910d66254626274858b5bc74807d0b1c0eac45bda79b555853d4528. 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/SEAEV1456010 — a six-check JSON result.
    date published: 2026-07-08T03:20:19Z
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    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Speechiness
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track: Serenade
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  duration: PT2M45S
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  additional property: OTSVerificationAPI
    type: PropertyValue
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  additional property: OTSTimestamp
    type: PropertyValue
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  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 0xfc965e600629f6e41397310a05c4e53a9e66e07ddbde35c25d437e58c54b3ed0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/SEAEV1456020 — a six-check JSON result.
    date published: 2026-07-31T12:24:41Z
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    additional property: Mode (Major/Minor)
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Haydn: Die sieben letzten Worte unseres Erlösers am Kreuze - Mozart: Quartett KV 370
type: MusicAlbum
date published: 2014-04-01

Bach: Sonatas for Viola and Piano, BWV 1027 - 1029
type: MusicAlbum
date published: 2011-06-01
track: Ich ruf' zu dir, Herr Jesu Christ, BWV 639 (Arr. for Viola and Piano)
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  by artist: Yumi Sekiya
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    date published: 2011-06-01
  genre: classical
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track: Mozart: Flute Quartet No. 2 in G Major, K. 285a: II. Tempo di menuetto
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track: Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (a) Thema. Andante
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track: Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (c) Variation II
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track: Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (e) Variation IV
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track: Mozart: Flute Quartet No. 4 in A Major, K. 298: III. Rondeau. Allegretto grazioso

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  additional property: Speechiness
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    value: 0.046
  additional property: Acousticness
    type: PropertyValue
    value: 0.98
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.869
  additional property: Liveness
    type: PropertyValue
    value: 0.225
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.103
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.644
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 2 in G Major, K. 285a: II. Tempo di menuetto
type: MusicRecording
duration: PT3M23S
duration ms: 203933
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901377
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T00:53:09+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf2c1ddff1d9566d7b6ec8dde2ea8fe7d43de73376600ed078986b2b98dfd160a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960183
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960183
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9901377
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T01:10:20Z
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 0xf2c1ddff1d9566d7b6ec8dde2ea8fe7d43de73376600ed078986b2b98dfd160a. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/GBAYC9901377 — a six-check JSON result.
  date published: 2026-07-30T01:10:20Z
audio: Mozart: Flute Quartet No. 2 in G Major, K. 285a: II. Tempo di menuetto
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 134.577
  additional property: Musical Key
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    value: 7
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    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
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  additional property: Acousticness
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    value: 0.981
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.837
  additional property: Liveness
    type: PropertyValue
    value: 0.077
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.566
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.825
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 3 in C Major, K. 285b: I. Allegro
type: MusicRecording
duration: PT8M34S
duration ms: 514159
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901379
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T01:38:34+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x08ebe487f62acc2f726f547e9dceb342e5b8a88aa9ba910789a02424705ea1fd
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960191
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960191
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9901379
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T01:51:26Z
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 0x08ebe487f62acc2f726f547e9dceb342e5b8a88aa9ba910789a02424705ea1fd. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/GBAYC9901379 — a six-check JSON result.
  date published: 2026-07-30T01:51:26Z
audio: Mozart: Flute Quartet No. 3 in C Major, K. 285b: I. Allegro
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 141.918
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.459
  additional property: Energy
    type: PropertyValue
    value: 0.113
  additional property: Speechiness
    type: PropertyValue
    value: 0.042
  additional property: Acousticness
    type: PropertyValue
    value: 0.978
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.915
  additional property: Liveness
    type: PropertyValue
    value: 0.071
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.426
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.637
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (a) Thema. Andantino
type: MusicRecording
duration: PT1M20S
duration ms: 80840
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901380
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T00:48:31+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfeb36c9d4222c3014534dd185870aff466614ae6652725ebb99348a7c0a4cee2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960183
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960183
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9901380
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T01:10:20Z
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 0xfeb36c9d4222c3014534dd185870aff466614ae6652725ebb99348a7c0a4cee2. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/GBAYC9901380 — a six-check JSON result.
  date published: 2026-07-30T01:10:20Z
audio: Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (a) Thema. Andantino
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 91.362
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.316
  additional property: Energy
    type: PropertyValue
    value: 0.056
  additional property: Speechiness
    type: PropertyValue
    value: 0.053
  additional property: Acousticness
    type: PropertyValue
    value: 0.965
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.837
  additional property: Liveness
    type: PropertyValue
    value: 0.272
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.233
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.113
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (b) Variation I
type: MusicRecording
duration: PT1M17S
duration ms: 77293
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901381
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T03:40:12+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa2556c741159f08568a33323e6d0df45c8403dc3fa3c8cebd05ec8ab5d8c3a64
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/GBAYC9901381
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 0xa2556c741159f08568a33323e6d0df45c8403dc3fa3c8cebd05ec8ab5d8c3a64. 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/GBAYC9901381 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (b) Variation I
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 120.105
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.442
  additional property: Energy
    type: PropertyValue
    value: 0.149
  additional property: Speechiness
    type: PropertyValue
    value: 0.047
  additional property: Acousticness
    type: PropertyValue
    value: 0.984
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.915
  additional property: Liveness
    type: PropertyValue
    value: 0.185
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.548
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.858
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (c) Variation II
type: MusicRecording
duration: PT1M14S
duration ms: 74173
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901382
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T03:55:14+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x4b1f74c4c0d172328026ae3ee7f5e80995276346ccbbb5485ebbbd1d532516c6
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/GBAYC9901382
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 0x4b1f74c4c0d172328026ae3ee7f5e80995276346ccbbb5485ebbbd1d532516c6. 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/GBAYC9901382 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (c) Variation II
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 139.427
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.406
  additional property: Energy
    type: PropertyValue
    value: 0.064
  additional property: Speechiness
    type: PropertyValue
    value: 0.048
  additional property: Acousticness
    type: PropertyValue
    value: 0.957
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.82
  additional property: Liveness
    type: PropertyValue
    value: 0.204
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.602
  additional property: Loudness (dB)
    type: PropertyValue
    value: -23.375
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (d) Variation III
type: MusicRecording
duration: PT1M17S
duration ms: 77426
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901383
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T22:13:04+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfa1319691a5980e7939c36aedb34cb54d0eda15c76424f87d2a7afda8b952bf1
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/GBAYC9901383
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 0xfa1319691a5980e7939c36aedb34cb54d0eda15c76424f87d2a7afda8b952bf1. 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/GBAYC9901383 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (d) Variation III
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 136.427
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.329
  additional property: Energy
    type: PropertyValue
    value: 0.064
  additional property: Speechiness
    type: PropertyValue
    value: 0.038
  additional property: Acousticness
    type: PropertyValue
    value: 0.959
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.773
  additional property: Liveness
    type: PropertyValue
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  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.443
  additional property: Loudness (dB)
    type: PropertyValue
    value: -22.854
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (e) Variation IV
type: MusicRecording
duration: PT1M24S
duration ms: 84666
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901384
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T15:11:38+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x255d4ccdb53904d9178ecf8e317eabfc779cfa563b45aa918d2919c26b17cc3a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960273
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960273
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9901384
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T15:42:38Z
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 0x255d4ccdb53904d9178ecf8e317eabfc779cfa563b45aa918d2919c26b17cc3a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBAYC9901384 — a six-check JSON result.
  date published: 2026-07-30T15:42:38Z
audio: Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (e) Variation IV
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 137.172
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.478
  additional property: Energy
    type: PropertyValue
    value: 0.032
  additional property: Speechiness
    type: PropertyValue
    value: 0.045
  additional property: Acousticness
    type: PropertyValue
    value: 0.987
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.213
  additional property: Liveness
    type: PropertyValue
    value: 0.135
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.309
  additional property: Loudness (dB)
    type: PropertyValue
    value: -28.107
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (f) Variation V. Adagio
type: MusicRecording
duration: PT2M19S
duration ms: 139106
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901385
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T05:13:51+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x08c7c839621a75b94afa392e50ba4cfb1a35a2cce1cf06c2a5c86df2f5c0560b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960212
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960212
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9901385
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T05:43:45Z
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 0x08c7c839621a75b94afa392e50ba4cfb1a35a2cce1cf06c2a5c86df2f5c0560b. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GBAYC9901385 — a six-check JSON result.
  date published: 2026-07-30T05:43:45Z
audio: Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (f) Variation V. Adagio
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 136.959
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.245
  additional property: Energy
    type: PropertyValue
    value: 0.063
  additional property: Speechiness
    type: PropertyValue
    value: 0.046
  additional property: Acousticness
    type: PropertyValue
    value: 0.947
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.756
  additional property: Liveness
    type: PropertyValue
    value: 0.309
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.039
  additional property: Loudness (dB)
    type: PropertyValue
    value: -25.318
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (g) Variation VI. Allegro
type: MusicRecording
duration: PT1M0S
duration ms: 60960
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901386
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T14:45:47+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xeda7b2716ddb0ae0309327fa362172b170308f77f4ae80e4dee160f44f706b67
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960268
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960268
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9901386
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T14:53:07Z
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 0xeda7b2716ddb0ae0309327fa362172b170308f77f4ae80e4dee160f44f706b67. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/GBAYC9901386 — a six-check JSON result.
  date published: 2026-07-30T14:53:07Z
audio: Mozart: Flute Quartet No. 3 in C Major, K. 285b: II. (g) Variation VI. Allegro
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 114.903
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.694
  additional property: Energy
    type: PropertyValue
    value: 0.186
  additional property: Speechiness
    type: PropertyValue
    value: 0.055
  additional property: Acousticness
    type: PropertyValue
    value: 0.973
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.877
  additional property: Liveness
    type: PropertyValue
    value: 0.106
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.88
  additional property: Loudness (dB)
    type: PropertyValue
    value: -23.478
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (a) Thema. Andante
type: MusicRecording
duration: PT1M14S
duration ms: 74066
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901388
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-29T18:52:39+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9f872db925289479ee563cec9e5e5e8d798918a757993863f7a60beba3652483
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960138
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960138
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9901388
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-29T19:35:34Z
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 0x9f872db925289479ee563cec9e5e5e8d798918a757993863f7a60beba3652483. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAYC9901388 — a six-check JSON result.
  date published: 2026-07-29T19:35:34Z
audio: Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (a) Thema. Andante
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 113.22
  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: 0.191
  additional property: Energy
    type: PropertyValue
    value: 0.052
  additional property: Speechiness
    type: PropertyValue
    value: 0.045
  additional property: Acousticness
    type: PropertyValue
    value: 0.989
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.898
  additional property: Liveness
    type: PropertyValue
    value: 0.162
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.301
  additional property: Loudness (dB)
    type: PropertyValue
    value: -28.238
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (b) Variation I
type: MusicRecording
duration: PT1M6S
duration ms: 66533
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901389
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T20:15:16+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd3b3c51cf3fd8f527af4d85c13c1ccc259c70ef5b54f4a50d82a0563b9bcfebc
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/GBAYC9901389
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 0xd3b3c51cf3fd8f527af4d85c13c1ccc259c70ef5b54f4a50d82a0563b9bcfebc. 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/GBAYC9901389 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (b) Variation I
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 136.982
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 6
  additional property: Danceability
    type: PropertyValue
    value: 0.363
  additional property: Energy
    type: PropertyValue
    value: 0.144
  additional property: Speechiness
    type: PropertyValue
    value: 0.051
  additional property: Acousticness
    type: PropertyValue
    value: 0.988
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.934
  additional property: Liveness
    type: PropertyValue
    value: 0.086
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.681
  additional property: Loudness (dB)
    type: PropertyValue
    value: -23.88
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (c) Variation II
type: MusicRecording
duration: PT1M5S
duration ms: 65173
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901390
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T09:14:33+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x5d6864f4793a436f524f4a8c35623e8ee90070a3ac104a3ce95aa7fe7d99e1bc
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960240
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960240
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9901390
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T09:57:33Z
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 0x5d6864f4793a436f524f4a8c35623e8ee90070a3ac104a3ce95aa7fe7d99e1bc. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBAYC9901390 — a six-check JSON result.
  date published: 2026-07-30T09:57:33Z
audio: Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (c) Variation II
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 130.455
  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: 0.245
  additional property: Energy
    type: PropertyValue
    value: 0.14
  additional property: Speechiness
    type: PropertyValue
    value: 0.043
  additional property: Acousticness
    type: PropertyValue
    value: 0.969
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.836
  additional property: Liveness
    type: PropertyValue
    value: 0.128
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.532
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.845
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Major

Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (d) Variation III
type: MusicRecording
duration: PT1M9S
duration ms: 69426
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Emmanuel Pahud
by artist: Christoph Poppen
by artist: Hariolf Schlichtig
by artist: Jean-Guihen Queyras
in album: Mozart: Flute Quartets Nos. 1 - 4
  type: MusicAlbum
  date published: 1999-08-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: GBAYC9901391
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T04:02:35+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x71a7640bf5c4a503dfba2bee7628ec9b80e8688f36742bd48e2ccea6b214309a
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/GBAYC9901391
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:22:41Z
additional property: OTSVerifyInstructions
  type: PropertyValue
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subject of: OpenTimestamps Proof of Existence
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Mozart: Flute Quartet No. 4 in A Major, K. 298: I. (e) Variation IV
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Mozart: Flute Quartet No. 4 in A Major, K. 298: III. Rondeau. Allegretto grazioso
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  date published: 2026-07-30T17:23:26Z
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Mendelssohn: Trio for Violin, Viola and Piano - Sonatas for Viola and Clarinet
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100 Best Chamber Music
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    date published: 2026-07-06T06:56:49Z
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track: Mozart: Eine kleine Nachtmusik, K. 525: II. Romance. Andante
track: Beethoven: Septet in E-Flat Major, Op. 20: III. Tempo di menuetto
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track: Beethoven: String Quartet No. 7 in F Major, Op. 59 No. 1 "Razumovsky": I. Allegro
track: The Earle of Essex Galiard from Lachrimae, or Seaven Teares
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track: Bach, JS: Gottes Zeit ist die allerbeste Zeit, BWV 106 "Actus Tragicus": No. 1, Sonatina
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track: Beethoven: Cello Sonata No. 3 in A Major, Op. 69: I. Allegro ma non tanto (Excerpt)
track: Ricercare del duodecimo tuono a 4 (Madrigali et ricercari, 1589) - 1989 Remastered Version
track: String Quartet No.17 in B flat "Hunt" K458: I. Allegro vivace assai (extract)
track: Beethoven: String Quartet No. 4 in C Minor, Op. 18 No. 4: III. Menuetto. Allegretto
track: Boccherini: String Quintet in E Major, Op. 11 No. 5, G. 275: III. Minuetto
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track: Bach, JS: Concerto for Flute, Violin and Harpsichord in A Minor, BWV 1044: II. Adagio ma non tanto e dolce
track: Mozart: Violin Sonata No. 21 in E Minor, K. 304: II. Tempo di menuetto
track: Beethoven: Violin Sonata No. 9 in A Major, Op. 47 "Kreutzer": I. Adagio sostenuto - Presto (Excerpt)
track: Bach, JS: Viola da Gamba Sonata No. 3 in G Minor, BWV 1029: I. Vivace
track: Haydn: String Quartet in B-Flat Major, Op. 76 No. 4, Hob. III:78 "Sunrise": I. Allegro con spirito (Excerpt)
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track: Lachrimae Antiquae from Lachrimae, or Seaven Teares
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track: Schubert: Arpeggione Sonata in A Minor, D. 821: I. Allegro moderato (Excerpt)
track: Bach, JS: Sonata No. 1 in B-Flat Major: I. — (After Trio Sonata No. 1, BWV 525)
track: Haydn: The Seven Last Words, Op. 51, Hob. XX/1B: Sonata VII. "Pater, in manus tuas commendo spiritum meum"
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track: Mozart: Divertimento in D Major, K. 136 "Salzburg Symphony No. 1": I. Allegro
track: Boccherini: Guitar Quintet No. 4 in D Major, G. 448 "Fandango": IV. Fandango (Excerpt)
track: Mozart: Serenade for Winds No. 10 in B-Flat Major, K. 361 "Gran partita": III. Adagio
track: Purcell: Fantasias and In nomines: No. 1 in D Minor, Z. 732
track: Mozart: Serenade No. 6 in D Major, K. 239 "Serenata Notturna": I. Marcia. Maestoso
track: Vivaldi: The Four Seasons, Violin Concerto in E Major, Op. 8 No. 1, RV 269 "Spring": I. Allegro
track: Handel: Violin Sonata in G Major, HWV 358
track: Bach, JS: Musikalisches Opfer, BWV 1079: Sonata sopr' il soggetto Reale. IV. Allegro
track: Bach, JS: Violin Sonata in E Minor, BWV 1023: I. — & II. Adagio ma non tanto
track: Gluck: Orphée et Eurydice, Wq. 41, Act 2: Danse des ombres heureuses

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Beethoven: Violin Sonata No. 5 in F Major, Op. 24 "Spring": I. Allegro (Excerpt)
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by artist: Daniel Barenboim
by artist: Pinchas Zukerman
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popularity: 2
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Bach, JS: Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano
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duration: PT2M24S
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by artist: Johann Sebastian Bach
by artist: Michel Debost/Lionel Rogg
by artist: Michel Debost
by artist: Lionel Rogg
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  date published: 2012-10-29
popularity: 5
genre: classical
genre: classical-piano
genre: early-music
genre: baroque
genre: chamber-music
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T21:57:12Z
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Mozart: Eine kleine Nachtmusik, K. 525: IV. Rondo. Allegro
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duration: PT4M10S
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by artist: Wolfgang Amadeus Mozart
by artist: London Mozart Players
by artist: Jane Glover
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  type: MusicAlbum
  date published: 2012-10-29
popularity: 3
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T04:47:22Z
audio: Mozart: Eine kleine Nachtmusik, K. 525: IV. Rondo. Allegro
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Beethoven: String Quartet No. 7 in F Major, Op. 59 No. 1 "Razumovsky": I. Allegro
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duration: PT9M29S
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by artist: Ludwig van Beethoven
by artist: Alban Berg Quartett
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popularity: 2
genre: classical
genre: classical-piano
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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 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
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  date published: 2026-07-30T14:36:16Z
audio: Beethoven: String Quartet No. 7 in F Major, Op. 59 No. 1 "Razumovsky": I. Allegro
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The Earle of Essex Galiard from Lachrimae, or Seaven Teares
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by artist: Fretwork
by artist: Christopher Wilson
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popularity: 5
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-07T14:18:56Z
audio: The Earle of Essex Galiard from Lachrimae, or Seaven Teares
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Mozart: String Quintet No. 4 in G Minor, K. 516: III. Adagio ma non troppo (Excerpt)
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by artist: Alban Berg Quartett
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popularity: 2
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
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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 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
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  date published: 2026-07-08T03:20:19Z
audio: Mozart: String Quintet No. 4 in G Minor, K. 516: III. Adagio ma non troppo (Excerpt)
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Beethoven: Piano Trio No. 4 in B-Flat Major, Op. 11 "Gassenhauer": II. Adagio
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by artist: Nash Ensemble
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popularity: 2
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSVerificationAPI
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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Bach, JS: Gottes Zeit ist die allerbeste Zeit, BWV 106 "Actus Tragicus": No. 1, Sonatina
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Haydn: String Quartet in C Major, Op. 76 No. 3, Hob. III:77 "Emperor": II. Poco adagio, cantabile (Excerpt)
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  date published: 2026-07-08T03:20:19Z
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Beethoven: String Quartet No. 1 in F Major, Op. 18 No. 1: II. Adagio affettuoso ed appassionato (Excerpt)
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  date published: 2026-07-08T03:20:19Z
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Telemann: Tafelmusik, Pt. 3, Oboe Sonata in G Minor, TWV 41:g6: VI. Allegro
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Mozart: Divertimento No. 17 in D Major, K. 334/320b: III. Menuetto - Trio
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Beethoven: Cello Sonata No. 3 in A Major, Op. 69: I. Allegro ma non tanto (Excerpt)
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Ricercare del duodecimo tuono a 4 (Madrigali et ricercari, 1589) - 1989 Remastered Version
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String Quartet No.17 in B flat "Hunt" K458: I. Allegro vivace assai (extract)
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Beethoven: String Quartet No. 4 in C Minor, Op. 18 No. 4: III. Menuetto. Allegretto
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Boccherini: String Quintet in E Major, Op. 11 No. 5, G. 275: III. Minuetto
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Mozart: Flute Quartet No. 1 in D Major, K. 285: I. Allegro (Excerpt)
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Beethoven: Piano Trio No. 5 in D Major, Op. 70 No. 1 "Ghost": II. Largo assai ed espressivo (Excerpt)
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Bach, JS: Concerto for Flute, Violin and Harpsichord in A Minor, BWV 1044: II. Adagio ma non tanto e dolce
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  date published: 2026-07-30T00:16:15Z
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Mozart: Violin Sonata No. 21 in E Minor, K. 304: II. Tempo di menuetto
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  date published: 2026-07-30T12:45:34Z
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Beethoven: Violin Sonata No. 9 in A Major, Op. 47 "Kreutzer": I. Adagio sostenuto - Presto (Excerpt)
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Bach, JS: Viola da Gamba Sonata No. 3 in G Minor, BWV 1029: I. Vivace
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Haydn: String Quartet in B-Flat Major, Op. 76 No. 4, Hob. III:78 "Sunrise": I. Allegro con spirito (Excerpt)
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Schubert: String Quartet No. 13 in A Minor, Op. 29, D. 804 "Rosamunde": II. Andante
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Lachrimae Antiquae from Lachrimae, or Seaven Teares
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Mozart: Clarinet Quintet in A Major, K. 581 "Stadler": I. Allegro
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Mozart: Clarinet Quintet in A Major, K. 581 "Stadler": I. Allegro
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Schubert: Arpeggione Sonata in A Minor, D. 821: I. Allegro moderato (Excerpt)
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T07:28:30Z
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Bach, JS: Sonata No. 1 in B-Flat Major: I. — (After Trio Sonata No. 1, BWV 525)
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T01:10:20Z
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Haydn: The Seven Last Words, Op. 51, Hob. XX/1B: Sonata VII. "Pater, in manus tuas commendo spiritum meum"
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T12:45:34Z
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Schubert: String Quartet No. 14 in D Minor, D. 810 "Death and the Maiden": II. Andante con moto (Excerpt)
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Bach, JS: Brandenburg Concerto No. 5 in D Major, BWV 1050: II. Affettuoso
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-07T15:12:44Z
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Mozart: Divertimento in D Major, K. 136 "Salzburg Symphony No. 1": I. Allegro
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subject of: OpenTimestamps Proof of Existence
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Boccherini: Guitar Quintet No. 4 in D Major, G. 448 "Fandango": IV. Fandango (Excerpt)
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Mozart: Serenade for Winds No. 10 in B-Flat Major, K. 361 "Gran partita": III. Adagio
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  date published: 2026-07-08T03:20:19Z
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Purcell: Fantasias and In nomines: No. 1 in D Minor, Z. 732
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Mozart: Serenade No. 6 in D Major, K. 239 "Serenata Notturna": I. Marcia. Maestoso
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Vivaldi: The Four Seasons, Violin Concerto in E Major, Op. 8 No. 1, RV 269 "Spring": I. Allegro
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Handel: Violin Sonata in G Major, HWV 358
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Bach, JS: Musikalisches Opfer, BWV 1079: Sonata sopr' il soggetto Reale. IV. Allegro
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Festliches Osterkonzert 2024
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Work - Schumann
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track: Piano Concerto in A Minor, Op. 54: I. Allegro affettuoso
track: Waldszenen, Op. 82: VII. Der Vogel als Prophet
track: Waldszenen, Op. 82: No. 9, Abschied
track: 3 Romances, Op. 94: III. Nicht schnell
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T06:42:11Z
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Waldszenen, Op. 82: VII. Der Vogel als Prophet
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by artist: Moura Lympany
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T05:09:12Z
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Waldszenen, Op. 82: No. 9, Abschied
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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3 Romances, Op. 94: III. Nicht schnell
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T08:26:41Z
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Ave Maria
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T12:24:41Z
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Albumblätter, Op. 124: No. 6, Wiegenliedchen
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
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Arabeske in C Major, Op. 18
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T18:48:12Z
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Cello Concerto in A Minor, Op. 129: III. Sehr lebhaft
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audio: Cello Concerto in A Minor, Op. 129: III. Sehr lebhaft
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Kinderszenen, Op. 15: XII. Kind im Einschlummern
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subject of: OpenTimestamps Proof of Existence
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Papillons Op. 2: 1.
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subject of: OpenTimestamps Proof of Existence
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Ostern Kirchenmusik
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track: Messiah, HWV 56, Pt. 1 Scene 4: Pifa (Pastoral Symphony). Larghetto
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Discovery of a Romanticist, Vol. 1
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Mozart: Das Beste - Klassik die man gehört muss
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The Complete Warner Classics Recordings
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Sleeping - Schumann
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track: Fantasie in C Major, Op. 17: III. Langsam getragen - Durchweg leise zu halten
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