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genre: chamber music
genre: classical
genre: classical piano
description: thumb Lucas Debargue (born 23 October 1990) is a French pianist and composer. He was awarded fourth prize at the XV International Tchaikovsky Competition. Early life and education Lucas Debargue
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  track: Gaspard de la Nuit, M. 55: 3. Scarbo - Live
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album: Bach, Beethoven, Medtner
album: Schubert, Szymanowski
track: Lyric Pieces, Book III, Op.47: 3. Melody - Live
track: Sicilienne, Op. 78
track: Nostalgie du pays, extrait des Miniatures polonaises
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track: Quatuor pour la fin du Temps: I. Liturgie de cristal
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track: Quatuor pour la fin du Temps: V. Louange à l'éternité de Jésus
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track: Quatuor pour la fin du Temps: VIII. Louange à l'immortalité de Jésus
track: Piano Trio No. 1, Op. 8: II. Andante - Meno mosso - Moderato - Allegro - Prestissimo fantastico - Andante - Poco più mosso - Live from Verbier Festival / 2017
track: Piano Trio No. 1, Op. 8: I. Andante - Molto più mosso - Andante - Allegro - Più mosso - Adagio - Live from Verbier Festival / 2017
track: Piano Trio No. 1, Op. 8: III. Coda. Allegro - Allegro moderato - Allegro - Live from Verbier Festival / 2017

Lyric Pieces, Book III, Op.47: 3. Melody - Live
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Sicilienne, Op. 78
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Nostalgie du pays, extrait des Miniatures polonaises
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Piano Concerto No. 25 in C Major, K. 503: I. Allegro maestoso
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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additional property: TokenDeploymentConfirmed
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: Piano Concerto No. 25 in C Major, K. 503: I. Allegro maestoso
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Piano Concerto No. 25 in C Major, K. 503: Piano Concerto No. 25 in C Major, K. 503/II. Andante
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duration: PT7M24S
duration ms: 444040
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by artist: Wolfgang Amadeus Mozart
by artist: Martin Fröst
by artist: Lucas Debargue
by artist: Swedish Chamber Orchestra
in album: Mozart: Ecstasy & Abyss [LEIPZIG, 1789]
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genre: classical
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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: 2026-07-02T05:09:12Z
audio: Piano Concerto No. 25 in C Major, K. 503: Piano Concerto No. 25 in C Major, K. 503/II. Andante
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Piano Concerto No. 25 in C Major, K. 503: III. Allegretto
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explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Martin Fröst
by artist: Lucas Debargue
by artist: Swedish Chamber Orchestra
in album: Mozart: Ecstasy & Abyss [LEIPZIG, 1789]
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genre: classical
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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additional property: ProofProfileEvidenceStatus
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: Piano Concerto No. 25 in C Major, K. 503: III. Allegretto
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Quatuor pour la fin du Temps: I. Liturgie de cristal
type: MusicRecording
duration: PT2M42S
duration ms: 162653
explicit: false
by artist: Olivier Messiaen
by artist: Martin Fröst
by artist: Lucas Debargue
by artist: Torleif Thedéen
by artist: Janine Jansen
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genre: classical
genre: avant-garde
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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  date published: 2026-06-13T15:41:10Z
audio: Quatuor pour la fin du Temps: I. Liturgie de cristal
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Quatuor pour la fin du Temps: II. Vocalise, pour l'Ange qui annonce la fin du Temps
type: MusicRecording
duration: PT5M1S
duration ms: 301040
explicit: false
by artist: Olivier Messiaen
by artist: Martin Fröst
by artist: Lucas Debargue
by artist: Torleif Thedéen
by artist: Janine Jansen
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genre: classical
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  date published: 2026-07-02T03:55:08Z
audio: Quatuor pour la fin du Temps: II. Vocalise, pour l'Ange qui annonce la fin du Temps
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Quatuor pour la fin du Temps: V. Louange à l'éternité de Jésus
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genre: classical
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  date published: 2026-06-13T13:32:09Z
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Quatuor pour la fin du Temps: VI. Danse de la fureur, pour les sept trompettes
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genre: classical
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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  value: 2026-07-02T03:30:09+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2ec5272d86b19d82de1909d607617333919184efc199cfa795b6b5744666bd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11705917.
  date published: 2026-07-02T03:30:09Z
audio: Quatuor pour la fin du Temps: VI. Danse de la fureur, pour les sept trompettes
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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  additional property: Key Name
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Quatuor pour la fin du Temps: VII. Fouillis d'arcs-en-ciel, pour l'Ange qui annonce la fin du Temps
type: MusicRecording
duration: PT7M28S
duration ms: 448253
explicit: false
by artist: Olivier Messiaen
by artist: Martin Fröst
by artist: Lucas Debargue
by artist: Torleif Thedéen
by artist: Janine Jansen
in album: Messiaen: Quatuor pour la fin du temps (Quartet for the End of Time)
  type: MusicAlbum
  date published: 2017-11-03
genre: classical
genre: avant-garde
isrc code: USSM11705918
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
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11705918
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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a5a45a0167d4bec14dda9583e721b96a3d8adf727e7b9466e67f254f1eed61. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11705918.
  date published: 2026-07-02T03:55:08Z
audio: Quatuor pour la fin du Temps: VII. Fouillis d'arcs-en-ciel, pour l'Ange qui annonce la fin du Temps
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
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  additional property: Danceability
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Quatuor pour la fin du Temps: VIII. Louange à l'immortalité de Jésus
type: MusicRecording
duration: PT7M23S
duration ms: 443240
explicit: false
by artist: Olivier Messiaen
by artist: Lucas Debargue
by artist: Janine Jansen
in album: Messiaen: Quatuor pour la fin du temps (Quartet for the End of Time)
  type: MusicAlbum
  date published: 2017-11-03
genre: classical
genre: avant-garde
isrc code: USSM11705919
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
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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
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11705919
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:30:09+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
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additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
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additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-02T03:30:09+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36ea623df1f7064f61066ec7238e100986b72a7027f05b00adbf454df7306b2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11705919.
  date published: 2026-07-02T03:55:08Z
audio: Quatuor pour la fin du Temps: VIII. Louange à l'immortalité de Jésus
  type: AudioObject
  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: Danceability
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  additional property: Energy
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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  additional property: Key Name
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  additional property: Mode Name
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Piano Trio No. 1, Op. 8: II. Andante - Meno mosso - Moderato - Allegro - Prestissimo fantastico - Andante - Poco più mosso - Live from Verbier Festival / 2017
type: MusicRecording
duration: PT6M48S
duration ms: 408906
explicit: false
by artist: Dmitri Shostakovich
by artist: Janine Jansen
by artist: Mischa Maisky
by artist: Lucas Debargue
in album: Shostakovich: Piano Trio No. 1, Op. 8 (Live from Verbier Festival / 2017)
  type: MusicAlbum
  date published: 2020-07-17
isrc code: DEN961702392
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
  value: https://blockstream.info/api/block-height/957118
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961702392
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 957118
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-08T03:20:19+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa88c0a8eda1099d424c3f84a3eff5731cc5eea4dc0a0b80e37d756e88c2aed9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961702392.
  date published: 2026-07-08T03:22:41Z
audio: Piano Trio No. 1, Op. 8: II. Andante - Meno mosso - Moderato - Allegro - Prestissimo fantastico - Andante - Poco più mosso - Live from Verbier Festival / 2017
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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: Time Signature
    type: PropertyValue
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  additional property: Danceability
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  additional property: Speechiness
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  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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  additional property: Mode Name
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Piano Trio No. 1, Op. 8: I. Andante - Molto più mosso - Andante - Allegro - Più mosso - Adagio - Live from Verbier Festival / 2017
type: MusicRecording
duration: PT4M29S
duration ms: 269213
explicit: false
by artist: Dmitri Shostakovich
by artist: Janine Jansen
by artist: Mischa Maisky
by artist: Lucas Debargue
in album: Shostakovich: Piano Trio No. 1, Op. 8 (Live from Verbier Festival / 2017)
  type: MusicAlbum
  date published: 2020-07-17
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a49cfb7c46467e90b12f7a4e4ae0ac93ad06ad5aef97c2f98d16a5ed22a242. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961702391.
  date published: 2026-07-31T08:26:41Z
audio: Piano Trio No. 1, Op. 8: I. Andante - Molto più mosso - Andante - Allegro - Più mosso - Adagio - Live from Verbier Festival / 2017
  type: AudioObject
  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: 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
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
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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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isrc code: DEN961702391
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961702391
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960368
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T08:26:41+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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

Piano Trio No. 1, Op. 8: III. Coda. Allegro - Allegro moderato - Allegro - Live from Verbier Festival / 2017
type: MusicRecording
duration: PT1M45S
duration ms: 105042
explicit: false
by artist: Dmitri Shostakovich
by artist: Janine Jansen
by artist: Mischa Maisky
by artist: Lucas Debargue
in album: Shostakovich: Piano Trio No. 1, Op. 8 (Live from Verbier Festival / 2017)
  type: MusicAlbum
  date published: 2020-07-17
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca825bac775d7e52310739bdda9e1a9a5d48a0933143fa80b96c31a31bfc2bf. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961702393.
  date published: 2026-07-31T13:04:34Z
audio: Piano Trio No. 1, Op. 8: III. Coda. Allegro - Allegro moderato - Allegro - Live from Verbier Festival / 2017
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
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    value: 0
  additional property: Mode (Major/Minor)
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  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
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
    type: PropertyValue
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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isrc code: DEN961702393
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961702393
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  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

Instrumentalness
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value: 0.931

Liveness
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value: 0.709

Valence (Positivity)
type: PropertyValue
value: 0.038

Loudness (dB)
type: PropertyValue
value: -19.702

Key Name
type: PropertyValue
value: F#

Mode Name
type: PropertyValue
value: Major

Bach, Beethoven, Medtner
type: MusicAlbum
date published: 2016-09-23
track: Toccata in C Minor, BWV 911: Toccata
  type: MusicRecording
  duration: PT3M35S
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  explicit: false
  by artist: Lucas Debargue
  in album: Bach, Beethoven, Medtner
    type: MusicAlbum
    date published: 2016-09-23
  genre: chamber music
  genre: classical
  genre: classical piano
  isrc code: USSM11604999
  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
    value: https://blockstream.info/api/block-height/958544
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11604999
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-18T12:14:37Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
  subject of: OpenTimestamps Proof of Existence
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