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description: right|thumb|Kalkbrenner by Henri Grévedon, 1829 Friedrich Wilhelm Michael Kalkbrenner (7 November 1785 – 10 June 1849), also known as Frédéric Kalkbrenner, was a pianist, composer, piano teacher and
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album: Hummel - Kalkbrenner: Klavierkonzerte
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album: Classical Selection - Hummel & Kalkbrenner: Piano Concertos
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album: Kalkbrenner: Piano Concerto No. 1 - Hummel: Piano Concerto No. 4
album: Clara Schumann: Piano Concerto & Works by Hiller, Herz & Kalkbrenner (Hyperion Romantic Piano Concerto 78)
album: Kalkbrenner: Chamber Music
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album: Romantic Piano Etudes
album: Romantic Piano Concertos, Vol. 1
album: Tellefsen & Kalkbrenner: Piano Concertos (Hyperion Romantic Piano Concerto 86)
album: Kalkbrenner: Piano Concertos Nos. 2 & 3 (Hyperion Romantic Piano Concerto 56)
album: Piano Genius and Acrobats
album: Chopin & Field: Complete Nocturnes
album: Chopin: His Contemporaries and His Instruments
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album: 50 Variations on a Waltz by Diabelli
album: Nikolai Demidenko Live at Wigmore Hall
album: Kalkbrenner: 25 Grandes Etudes de Style et de Perfectionnement, Op. 143
album: Friedrich Kalkbrenner: Complete Piano Music Vol. 1
album: Kalkbrenner: 3 Piano Sonatas, Op. 4
album: Kalkbrenner: 3 Piano Sonatas
album: Kalkbrenner: Piano Concertos Nos. 1 & 4 (Hyperion Romantic Piano Concerto 41)
album: Kalkbrenner: Romantische Klaviermusik
album: Kalkbrenner: Grand Septuor, Op. 132 & Grand Quintetto, Op. 81
album: Beethoven: Diabelli Variations
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album: Cantar con los dedos. Chopin, Thalberg, Kalkbrenner, Bellini.
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album: Piano Recital: Dubourg, Evelyn - Schubert, F. / Diabelli, A. / Czapek, L.E. / Czerny, C. / Kalkbrenner, F. / Hummel, J.N. / Liszt, F. / Moscheles, I.
album: Szymanowska : Album
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album: ディアベリ変奏曲
album: Hommage a chopin
album: Diabelli Variations
album: Dans un salon de la Nouvelle Athènes (Live)
album: Piano Recital: Malan, Petronel - Heller, S. / Sgambati, G. / Kalkbrenner, F. / Seiss, I. / Raff, J. / Tausig, C. (Transfigured Beethoven)
album: 200 Years Diabelli Variations
album: Beethoven, Liszt & Others: Diabelli Variations
album: Biedermeier

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track: Piano Concerto No. 4 in E Major, Op. 110: II. Andante con moto

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date published: 2026-07-29T22:48:59Z

Piano Concerto No. 1 in D Minor, Op. 61: III. Rondo. Vivace
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Clara Schumann: Piano Concerto & Works by Hiller, Herz & Kalkbrenner (Hyperion Romantic Piano Concerto 78)
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track: Piano Concerto in A Minor, Op. 7: I. Allegro maestoso –
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  audio: Piano Concerto in A Minor, Op. 7: III. Finale. Allegro non troppo
track: Rondo de concert, Op. 27

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date published: 2026-07-08T03:20:19Z

Piano Concerto in A Minor, Op. 7: III. Finale. Allegro non troppo
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Rondo de concert, Op. 27
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subject of: OpenTimestamps Proof of Existence
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  subject of: OpenTimestamps Proof of Existence
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OTSVerificationAPI
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OpenTimestamps Proof of Existence
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date published: 2026-07-08T03:20:19Z

Piano Concerto No. 2 in E Minor, Op. 85: III. Rondo. Allegretto grazioso
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Piano Genius and Acrobats
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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-31T22:27:44Z
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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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track: Nocturne, Op. 121: No. 2 in F Major (A trois mains)
track: Les cloches du monestère, Op. 54: Nocturne in D-Flat Major
track: La Murmure. Nocturne in A-Flat Major
track: Nocturne, Op. 21: No. 1 in G Minor

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OTSVerifyInstructions
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OpenTimestamps Proof of Existence
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date published: 2026-07-31T19:53:13Z

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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T15:42:38Z
audio: Nocturne, Op. 121: No. 2 in F Major (A trois mains)
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Les cloches du monestère, Op. 54: Nocturne in D-Flat Major
type: MusicRecording
duration: PT5M13S
duration ms: 313320
explicit: false
by artist: Louis James Alfred Lefébure-Wély
by artist: Bart Van Oort
in album: Chopin & Field: Complete Nocturnes
  type: MusicAlbum
  date published: 2006
isrc code: NLY330601475
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
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY330601475
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
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ed9721363ad44ddfff0925c00b0b26f559c1efd6236ce6d406d3b8e4f46eac. 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/NLY330601475 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Les cloches du monestère, Op. 54: Nocturne in D-Flat Major
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La Murmure. Nocturne in A-Flat Major
type: MusicRecording
duration: PT3M3S
duration ms: 183773
explicit: false
by artist: Maria Szymanowska
by artist: Bart Van Oort
in album: Chopin & Field: Complete Nocturnes
  type: MusicAlbum
  date published: 2006
isrc code: NLY330601480
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/NLY330601480
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T00:39:11Z
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 0x02e67dd656464c5add960dc3c5e40712a3bbc91c23f31cbbe30aa76e2742c151. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/NLY330601480 — a six-check JSON result.
  date published: 2026-07-30T00:39:11Z
audio: La Murmure. Nocturne in A-Flat Major
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  additional property: Tempo (BPM)
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  additional property: Mode (Major/Minor)
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Nocturne, Op. 21: No. 1 in G Minor
type: MusicRecording
duration: PT4M54S
duration ms: 294880
explicit: false
by artist: Ignacy Feliks Dobrzyński
by artist: Bart Van Oort
in album: Chopin & Field: Complete Nocturnes
  type: MusicAlbum
  date published: 2006
genre: classical-piano
isrc code: NLY330601481
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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  value: https://blockstream.info/api/block-height/960236
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY330601481
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 0x5791830e8641ce8053a6c4a9ff734625e4eaf33b94a1f3278835169e98d5ff81. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLY330601481 — a six-check JSON result.
  date published: 2026-07-30T09:37:10Z
audio: Nocturne, Op. 21: No. 1 in G Minor
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  additional property: Tempo (BPM)
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Chopin: His Contemporaries and His Instruments
type: MusicAlbum
date published: 2010
track: Nocturne in E-Flat Major, Op. 9 No. 2
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  duration: PT4M7S
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  by artist: Bart Van Oort
  in album: Chopin: His Contemporaries and His Instruments
    type: MusicAlbum
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  genre: classical
  genre: early-romantic-era
  genre: polish-classical
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  additional property: CopyrightID
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  additional property: OTSVerificationAPI
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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 0x294ae553db1c7c107c083f1f90e4b45ba3936b3d7fbbdfe33e3bd5d9fd45c6b1. 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/NLY331010853 — a six-check JSON result.
    date published: 2026-07-08T03:20:19Z
  audio: Nocturne in E-Flat Major, Op. 9 No. 2
    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
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.137
    additional property: Loudness (dB)
      type: PropertyValue
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    additional property: Key Name
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    additional property: Mode Name
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track: Nocturne in F Major, Op. 6 No. 2 (Soireés Musicales)
  type: MusicRecording
  duration: PT5M8S
  duration ms: 308920
  explicit: false
  by artist: Clara Schumann
  by artist: Bart Van Oort
  in album: Chopin: His Contemporaries and His Instruments
    type: MusicAlbum
    date published: 2010
  genre: classical
  genre: early-romantic-era
  genre: german-romanticism
  isrc code: NLY331010876
  additional property: CopyrightID
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  additional property: OTSVerificationAPI
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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 0x8133a8a718168a44980809c2b0ce79d8c718e7a1bbcd1792436baca291704f61. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331010876 — a six-check JSON result.
    date published: 2026-07-02T03:55:08Z
  audio: Nocturne in F Major, Op. 6 No. 2 (Soireés Musicales)
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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: 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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    additional property: Key Name
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track: Nocturne in D-Flat Major, Op. 54 "Les Cloches du Monastère"
  type: MusicRecording
  duration: PT5M13S
  duration ms: 313320
  explicit: false
  by artist: Louis James Alfred Lefébure-Wély
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    type: MusicAlbum
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  additional property: OTSBitcoinBlock
  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
  additional property: OTSTimestamp
  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Nocturne in D-Flat Major, Op. 54 "Les Cloches du Monastère"

OTSHash
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OTSBitcoinBlock
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value: 957118

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/957118

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331010877

OTSTimestamp
type: PropertyValue
value: 2026-07-08T03:20:19Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8128b6e1d48c1ce05a7cfb01667f79192398dbfdbc1038b32c512f46a18f06. 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/NLY331010877 — a six-check JSON result.
date published: 2026-07-08T03:20:19Z

Nocturne in D-Flat Major, Op. 54 "Les Cloches du Monastère"
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additional property: Tempo (BPM)
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additional property: Musical Key
  type: PropertyValue
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additional property: Mode (Major/Minor)
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additional property: Time Signature
  type: PropertyValue
  value: 5
additional property: Danceability
  type: PropertyValue
  value: 0.354
additional property: Energy
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additional property: Speechiness
  type: PropertyValue
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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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additional property: Key Name
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additional property: Mode Name
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Nocturnes Part: 4
type: MusicAlbum
date published: 2006-12-20
track: Nocturne Alla Field In B Flat Major
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  by artist: Camille Pleyel
  by artist: Peter Arts
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    type: MusicAlbum
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  isrc code: NLN580541305
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  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xa2fb464ed08e1dd3cfc508edad61f5887dcb2f0ae9ec002fd403514928c9e83c
  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/NLN580541305
  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 0xa2fb464ed08e1dd3cfc508edad61f5887dcb2f0ae9ec002fd403514928c9e83c. 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/NLN580541305 — a six-check JSON result.
    date published: 2026-07-08T03:20:19Z
  audio: Nocturne Alla Field In B Flat Major
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 95.946
    additional property: Musical Key
      type: PropertyValue
      value: 10
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.291
    additional property: Energy
      type: PropertyValue
      value: 0.033
    additional property: Speechiness
      type: PropertyValue
      value: 0.045
    additional property: Acousticness
      type: PropertyValue
      value: 0.994
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.912
    additional property: Liveness
      type: PropertyValue
      value: 0.077
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.138
    additional property: Loudness (dB)
      type: PropertyValue
      value: -30.506
    additional property: Key Name
      type: PropertyValue
      value: Bb
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Nocturne In F Major, Op. 121 No 2 (A Trois Mains)
  type: MusicRecording
  duration: PT4M2S
  duration ms: 242000
  explicit: false
  by artist: Bart Van Oort
  by artist: Friedrich Kalkbrenner
  by artist: Agnieszka Chabowska
  by artist: Peter Arts
  in album: Nocturnes Part: 4
    type: MusicAlbum
    date published: 2006-12-20
  isrc code: NLN580541307
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-31T16:51:26+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x76d0f1071f6fa0ea55ed7b0c6453ed041892685b070d7d8b7d35c8f49186ff05
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 960441
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960441
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580541307
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-31T17:29:52Z
  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 0x76d0f1071f6fa0ea55ed7b0c6453ed041892685b070d7d8b7d35c8f49186ff05. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLN580541307 — a six-check JSON result.
    date published: 2026-07-31T17:29:52Z
  audio: Nocturne In F Major, Op. 121 No 2 (A Trois Mains)
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 95.567
    additional property: Musical Key
      type: PropertyValue
      value: 5
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.361
    additional property: Energy
      type: PropertyValue
      value: 0.042
    additional property: Speechiness
      type: PropertyValue
      value: 0.036
    additional property: Acousticness
      type: PropertyValue
      value: 0.993
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.92
    additional property: Liveness
      type: PropertyValue
      value: 0.108
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.228
    additional property: Loudness (dB)
      type: PropertyValue
      value: -30.583
    additional property: Key Name
      type: PropertyValue
      value: F
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Nocturne In F Major, Op 6, No 2 From: Soireés Musicales
  type: MusicRecording
  duration: PT5M7S
  duration ms: 307500
  explicit: false
  by artist: Bart Van Oort
  by artist: Clara Schumann
  by artist: Peter Arts
  in album: Nocturnes Part: 4
    type: MusicAlbum
    date published: 2006-12-20
  isrc code: NLN580541308
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-06T18:48:35+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x84e5512ad4286ebbf61ad8b9dbfee9d8f843e7205dfb6c0be60ab368b71688c2
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 957118
  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
  additional property: OTSTimestamp
  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Nocturne In F Major, Op 6, No 2 From: Soireés Musicales
track: Les Cloches Du Monestère Nocturne In D Flat Major, Op. 54
track: La Murmure. Nocturne In A Flat Major.
track: Nocturne In G Minor, Op. 21 No 1

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/957118

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580541308

OTSTimestamp
type: PropertyValue
value: 2026-07-08T03:20:19Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e5512ad4286ebbf61ad8b9dbfee9d8f843e7205dfb6c0be60ab368b71688c2. 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/NLN580541308 — a six-check JSON result.
date published: 2026-07-08T03:20:19Z

Nocturne In F Major, Op 6, No 2 From: Soireés Musicales
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 92.025
additional property: Musical Key
  type: PropertyValue
  value: 5
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 1
additional property: Time Signature
  type: PropertyValue
  value: 6
additional property: Danceability
  type: PropertyValue
  value: 0.366
additional property: Energy
  type: PropertyValue
  value: 0.032
additional property: Speechiness
  type: PropertyValue
  value: 0.047
additional property: Acousticness
  type: PropertyValue
  value: 0.995
additional property: Instrumentalness
  type: PropertyValue
  value: 0.89
additional property: Liveness
  type: PropertyValue
  value: 0.075
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.062
additional property: Loudness (dB)
  type: PropertyValue
  value: -29.338
additional property: Key Name
  type: PropertyValue
  value: F
additional property: Mode Name
  type: PropertyValue
  value: Major

Les Cloches Du Monestère Nocturne In D Flat Major, Op. 54
type: MusicRecording
duration: PT5M12S
duration ms: 312000
explicit: false
by artist: Bart Van Oort
by artist: Louis James Alfred Lefébure-Wély
by artist: Peter Arts
in album: Nocturnes Part: 4
  type: MusicAlbum
  date published: 2006-12-20
isrc code: NLN580541309
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T21:07:04+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7cd8d2d8e71e4b529d1a2a9cc304088db79c82b1c07c812420c89437691224a1
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/NLN580541309
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 0x7cd8d2d8e71e4b529d1a2a9cc304088db79c82b1c07c812420c89437691224a1. 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/NLN580541309 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Les Cloches Du Monestère Nocturne In D Flat Major, Op. 54
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 90.232
  additional property: Musical Key
    type: PropertyValue
    value: 8
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.411
  additional property: Energy
    type: PropertyValue
    value: 0.014
  additional property: Speechiness
    type: PropertyValue
    value: 0.038
  additional property: Acousticness
    type: PropertyValue
    value: 0.992
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.866
  additional property: Liveness
    type: PropertyValue
    value: 0.094
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.134
  additional property: Loudness (dB)
    type: PropertyValue
    value: -34.399
  additional property: Key Name
    type: PropertyValue
    value: Ab
  additional property: Mode Name
    type: PropertyValue
    value: Major

La Murmure. Nocturne In A Flat Major.
type: MusicRecording
duration: PT3M2S
duration ms: 182500
explicit: false
by artist: Bart Van Oort
by artist: Peter Arts
by artist: Maria Szymanowska
in album: Nocturnes Part: 4
  type: MusicAlbum
  date published: 2006-12-20
isrc code: NLN580541314
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T12:11:07+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6dd3e8a851aa540e1a18e7a722d707f0b2e0633128444f5993de827caca8c3ff
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/NLN580541314
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 0x6dd3e8a851aa540e1a18e7a722d707f0b2e0633128444f5993de827caca8c3ff. 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/NLN580541314 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: La Murmure. Nocturne In A Flat Major.
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 99.81
  additional property: Musical Key
    type: PropertyValue
    value: 8
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.251
  additional property: Energy
    type: PropertyValue
    value: 0.065
  additional property: Speechiness
    type: PropertyValue
    value: 0.04
  additional property: Acousticness
    type: PropertyValue
    value: 0.993
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.888
  additional property: Liveness
    type: PropertyValue
    value: 0.096
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.153
  additional property: Loudness (dB)
    type: PropertyValue
    value: -32.202
  additional property: Key Name
    type: PropertyValue
    value: Ab
  additional property: Mode Name
    type: PropertyValue
    value: Major

Nocturne In G Minor, Op. 21 No 1
type: MusicRecording
duration: PT4M53S
duration ms: 293500
explicit: false
by artist: Bart Van Oort
by artist: Peter Arts
by artist: Ignacy Feliks Dobrzyński
in album: Nocturnes Part: 4
  type: MusicAlbum
  date published: 2006-12-20
isrc code: NLN580541315
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T00:34:40+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xbed8036945c88ec4b6a347907f5a2d82191900ca32e1e618465518961d01007a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960334
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960334
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580541315
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T02:19:15Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed8036945c88ec4b6a347907f5a2d82191900ca32e1e618465518961d01007a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580541315 — a six-check JSON result.
  date published: 2026-07-31T02:19:15Z
audio: Nocturne In G Minor, Op. 21 No 1
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 99.828
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.348
  additional property: Energy
    type: PropertyValue
    value: 0.043
  additional property: Speechiness
    type: PropertyValue
    value: 0.037
  additional property: Acousticness
    type: PropertyValue
    value: 0.993
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.945
  additional property: Liveness
    type: PropertyValue
    value: 0.093
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.187
  additional property: Loudness (dB)
    type: PropertyValue
    value: -30.406
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Minor

50 Variations on a Waltz by Diabelli
type: MusicAlbum
date published: 2013-05-01

Nikolai Demidenko Live at Wigmore Hall
type: MusicAlbum
date published: 1993-10-01

Kalkbrenner: 25 Grandes Etudes de Style et de Perfectionnement, Op. 143
type: MusicAlbum
date published: 2019-11-29

Friedrich Kalkbrenner: Complete Piano Music Vol. 1
type: MusicAlbum
date published: 2015-10-20

Kalkbrenner: 3 Piano Sonatas, Op. 4
type: MusicAlbum
date published: 2015-06-30
track: Piano Sonata in G Minor, Op. 4 No. 1: III. Rondo: Presto
  type: MusicRecording
  duration: PT6M10S
  duration ms: 370155
  explicit: false
  by artist: Friedrich Kalkbrenner
  by artist: Luigi Gerosa
  in album: Kalkbrenner: 3 Piano Sonatas, Op. 4
    type: MusicAlbum
    date published: 2015-06-30
  isrc code: ITN321515366
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-31T00:43:30+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xf8599347462be6d43bff71b7785900f2a3fe42a1d0707f4c699349d1d2a6f967
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 960334
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960334
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN321515366
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-31T02:19:15Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
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    date published: 2026-07-31T02:19:15Z
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Kalkbrenner: Romantische Klaviermusik
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Kalkbrenner: Grand Septuor, Op. 132 & Grand Quintetto, Op. 81
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Beethoven: Diabelli Variations
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Diabelli's Waltz - The Complete Variations
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Cantar con los dedos. Chopin, Thalberg, Kalkbrenner, Bellini.
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Best of Beethoven
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Piano Recital: Dubourg, Evelyn - Schubert, F. / Diabelli, A. / Czapek, L.E. / Czerny, C. / Kalkbrenner, F. / Hummel, J.N. / Liszt, F. / Moscheles, I.
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type: MusicAlbum
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