Wilhelm Kempff
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genre: chamber music
genre: classical
genre: classical piano
description: thumbnail|right|300px|Album cover for Wilhelm Kempff's recording of Beethoven Piano Sonatas on DG 139 935 (1965), which received the Grand Prix du Disque Wilhelm Walter Friedrich Kempff (25 November 1
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album: Originals Beethoven Box
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  date published: 1995-01-01
  track: Coriolan, Op. 62: Coriolan Overture, Op. 62
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    by artist: Ludwig van Beethoven
    by artist: Berliner Philharmoniker
    by artist: Herbert von Karajan
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      date published: 1995-01-01
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    genre: classical
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-02T03:30:09Z
    audio: Coriolan, Op. 62: Coriolan Overture, Op. 62
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  track: Piano Concerto No. 4 in G Major, Op. 58: I. Allegro moderato (Cadenza: Kempff)
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  track: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": I. Grave – Allegro di molto e con brio
  track: Symphony No. 5 in C Minor, Op. 67: I. Allegro con brio
  track: Symphony No. 5 in C Minor, Op. 67: II. Andante con moto
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  track: Symphony No. 5 in C Minor, Op. 67: IV. Allegro
  track: Symphony No. 9 in D Minor, Op. 125 "Choral": III. Adagio molto e cantabile
  track: Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": I. Allegro
  track: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": I. Adagio sostenuto
  track: Symphony No. 7 in A Major, Op. 92: I. Poco sostenuto - Vivace
  track: Symphony No. 9 in D Minor, Op. 125 "Choral": IVa-b. Presto – Allegro assai - Recorded 1962
  track: Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": II. Adagio un poco moto –
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  track: Symphony No. 9 in D Minor, Op. 125 "Choral": IVc-j. Presto. O Freunde nicht diese Töne – Prestissimo - Recorded 1962
  track: Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": III. Rondo. Allegro ma non troppo
  track: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": III. Presto agitato
  track: Symphony No. 7 in A Major, Op. 92: III. Presto - Assai meno presto
  track: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": I. Allegro con brio
  track: Symphony No. 7 in A Major, Op. 92: IV. Allegro con brio
  track: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": II. Introduzione. Adagio molto
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  track: Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": I. Allegro assai
  track: Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": II. Andante con moto
  track: Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": III. Allegro ma non troppo
album: Arrangements or Transfigurations
album: Schumann: Papillons; Arabeske; Piano Concerto (Wilhelm Kempff: Complete Decca Recordings, Vol. 5)
album: Mozart: Piano Concerto No. 9 'Jeunehomme'; Piano Concerto No. 15 (Wilhelm Kempff: Complete Decca Recordings, Vol. 3)
album: Wilhelm Kempff plays Brahms and Mozart
album: KEMPFF plays BEETHOVEN vol. II (Remastered 2025)
album: Kempff Plays Beethoven, Vol. 1
album: Wolfgang Amadeus Mozart: Piano Concertos Nos. 8 & 24, Piano Sonata No. 11, Fantasia No. 3
album: Kempff: Chamber Music
album: "Kempff Plays": Beethoven & Chopin
album: Wilhelm Kempff: Lieder
album: Liszt: Piano Concerto No. 1; Piano Concerto No. 2 (Wilhelm Kempff: Complete Decca Recordings, Vol. 9)
album: Liszt: Années de pèlerinage; Légendes (Wilhelm Kempff: Complete Decca Recordings, Vol. 8)
album: J.S. Bach; Handel; F. Couperin; Rameau; Beethoven (Wilhelm Kempff: Complete Decca Recordings, Vol. 1)
album: Chopin: Piano Sonata No. 3; Ballade No. 3; Andante spianato et Grande polonaise brillante; Fantaisie; Polonaise-fantaisie (Wilhelm Kempff: Complete Decca Recordings, Vol. 7)
album: Chopin: Piano Sonata No. 2; Impromptus; Berceuse; Barcarolle (Wilhelm Kempff: Complete Decca Recordings, Vol. 6)
album: Brahms: Rhapsodies, Op. 79; Intermezzi, Op. 117; Six Piano Pieces, Op. 118 (Wilhelm Kempff: Complete Decca Recordings, Vol. 10)
album: Brahms: Four Ballades, Op. 10; Eight Piano Pieces, Op. 76; Rhapsodies, Op. 79; Intermezzi, Op. 117 (Wilhelm Kempff: Complete Decca Recordings, Vol. 11)
album: Brahms: Fantasias (Seven Piano Pieces), Op. 116; Four Piano Pieces, Op. 119 [Wilhelm Kempff: Complete Decca Recordings, Vol. 12]
album: Beethoven: Sonata for Cello and Piano No. 1; Sonata for Cello and Piano No. 3; Violin Sonata No. 9 'Kreutzer' (Wilhelm Kempff: Complete Decca Recordings, Vol. 13)
album: A Bach Recital (Wilhelm Kempff: Complete Decca Recordings, Vol. 2)
album: Bach, Mozart, Schubert & Schumann: Works for Piano
album: Beethoven: Op.27 & Op.109 - Chopin: Nocturne Op.9 No.3 - Schubert: Impromptu Op.90 No.4 - Schumann: Kreisleriana, Op.16 (Previously Unreleased Piano Recordings)
album: Beethoven: Sonatas Nos. 7 - 12
album: Beethoven: Sonatas Nos. 20 - 26
album: Beethoven: Sonatas Nos. 13 - 19
album: Beethoven: Sonatas Nos. 1 - 6
album: Schumann, Beethoven & Brahms: Works for Solo Piano (Live)
album: Wilhelm Kempff: Piano Recital 1962 (Live)
album: Mozart: Works for Piano
album: Schubert: Piano Sonatas Nos. 16 & 21
album: Kempff plays Bach
album: Beethoven Piano Sonatas: The Complete Wartime 78-rpm Recordings

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Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": I. Grave – Allegro di molto e con brio
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-22T13:34:27Z
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Symphony No. 5 in C Minor, Op. 67: I. Allegro con brio
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subject of: OpenTimestamps Proof of Existence
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by artist: Ludwig van Beethoven
by artist: Wiener Philharmoniker
by artist: Carlos Kleiber
in album: Originals Beethoven Box
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popularity: 25
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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  date published: 2026-06-13T13:32:09Z
audio: Symphony No. 5 in C Minor, Op. 67: II. Andante con moto
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Symphony No. 9 in D Minor, Op. 125 "Choral": I. Allegro ma non troppo, un poco maestoso
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duration: PT15M28S
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by artist: Ludwig van Beethoven
by artist: Berliner Philharmoniker
by artist: Herbert von Karajan
in album: Originals Beethoven Box
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popularity: 12
genre: classical
genre: classical-piano
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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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
audio: Symphony No. 9 in D Minor, Op. 125 "Choral": I. Allegro ma non troppo, un poco maestoso
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Piano Concerto No. 4 in G Major, Op. 58: II. Andante con moto
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duration: PT4M49S
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explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
by artist: Berliner Philharmoniker
by artist: Ferdinand Leitner
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 7
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightID
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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: 2026-07-22T14:03:35Z
audio: Piano Concerto No. 4 in G Major, Op. 58: II. Andante con moto
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Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio cantabile
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duration: PT4M55S
duration ms: 295000
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 7
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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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: 2026-07-29T19:35:34Z
audio: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio cantabile
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Symphony No. 5 in C Minor, Op. 67: III. Allegro
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duration: PT5M9S
duration ms: 309466
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by artist: Ludwig van Beethoven
by artist: Wiener Philharmoniker
by artist: Carlos Kleiber
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 34
genre: classical
genre: classical-piano
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: 2026-06-13T12:47:07Z
audio: Symphony No. 5 in C Minor, Op. 67: III. Allegro
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Symphony No. 9 in D Minor, Op. 125 "Choral": II. Scherzo. Molto vivace – Presto
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duration: PT11M0S
duration ms: 660000
explicit: false
by artist: Ludwig van Beethoven
by artist: Berliner Philharmoniker
by artist: Herbert von Karajan
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 12
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightID
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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
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  date published: 2026-07-02T03:30:09Z
audio: Symphony No. 9 in D Minor, Op. 125 "Choral": II. Scherzo. Molto vivace – Presto
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Piano Concerto No. 4 in G Major, Op. 58: III. Rondo. Vivace
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duration: PT10M29S
duration ms: 629000
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
by artist: Berliner Philharmoniker
by artist: Ferdinand Leitner
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 7
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056101733
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e2a5d106e35b98229fc99eaaac45683a9be9366474242723dfedd7752e4c02. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEF056101733.
  date published: 2026-07-22T15:38:35Z
audio: Piano Concerto No. 4 in G Major, Op. 58: III. Rondo. Vivace
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Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": III. Rondo. Allegro
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duration ms: 271000
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by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 6
genre: classical
genre: classical-piano
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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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-06T06:56:49Z
audio: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": III. Rondo. Allegro
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Symphony No. 5 in C Minor, Op. 67: IV. Allegro
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duration: PT10M50S
duration ms: 650533
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by artist: Ludwig van Beethoven
by artist: Wiener Philharmoniker
by artist: Carlos Kleiber
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 26
genre: classical
genre: classical-piano
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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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-13T12:53:06Z
audio: Symphony No. 5 in C Minor, Op. 67: IV. Allegro
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Symphony No. 9 in D Minor, Op. 125 "Choral": III. Adagio molto e cantabile
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duration: PT16M25S
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explicit: false
by artist: Ludwig van Beethoven
by artist: Berliner Philharmoniker
by artist: Herbert von Karajan
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 10
genre: classical
genre: classical-piano
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: 2026-07-02T03:55:08Z
audio: Symphony No. 9 in D Minor, Op. 125 "Choral": III. Adagio molto e cantabile
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Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": I. Allegro
type: MusicRecording
duration: PT20M15S
duration ms: 1215000
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
by artist: Berliner Philharmoniker
by artist: Ferdinand Leitner
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 8
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056101752
additional property: CopyrightID
additional property: CopyrightStatus
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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
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  date published: 2026-07-22T03:48:36Z
audio: Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": I. Allegro
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": I. Adagio sostenuto
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duration: PT6M0S
duration ms: 360600
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 8
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056500171
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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
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  date published: 2026-07-08T03:20:19Z
audio: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": I. Adagio sostenuto
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Symphony No. 7 in A Major, Op. 92: I. Poco sostenuto - Vivace
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duration: PT13M36S
duration ms: 816000
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by artist: Wiener Philharmoniker
by artist: Carlos Kleiber
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popularity: 20
genre: classical
genre: classical-piano
genre: chamber-music
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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
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  date published: 2026-06-13T15:41:10Z
audio: Symphony No. 7 in A Major, Op. 92: I. Poco sostenuto - Vivace
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Symphony No. 9 in D Minor, Op. 125 "Choral": IVa-b. Presto – Allegro assai - Recorded 1962
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duration: PT6M22S
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by artist: Berliner Philharmoniker
by artist: Herbert von Karajan
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popularity: 11
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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  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 0x8392be11448cf54fabeb99cdf19869d99c09642fd1c0643ebc00b6497e8eef89. 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/DEF056201687.
  date published: 2026-07-02T03:55:08Z
audio: Symphony No. 9 in D Minor, Op. 125 "Choral": IVa-b. Presto – Allegro assai - Recorded 1962
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Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": II. Adagio un poco moto –
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duration: PT7M34S
duration ms: 454906
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
by artist: Berliner Philharmoniker
by artist: Ferdinand Leitner
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 7
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056101753
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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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
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  date published: 2026-07-22T17:48:40Z
audio: Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": II. Adagio un poco moto –
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": II. Allegretto
type: MusicRecording
duration: PT2M19S
duration ms: 139400
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 5
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056500172
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
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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: 2026-07-07T18:39:05Z
audio: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": II. Allegretto
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Symphony No. 7 in A Major, Op. 92: II. Allegretto
type: MusicRecording
duration: PT8M9S
duration ms: 489000
explicit: false
by artist: Ludwig van Beethoven
by artist: Wiener Philharmoniker
by artist: Carlos Kleiber
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 32
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF057601361
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
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057601361
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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  date published: 2026-06-13T12:47:07Z
audio: Symphony No. 7 in A Major, Op. 92: II. Allegretto
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  additional property: Tempo (BPM)
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  additional property: Liveness
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  additional property: Valence (Positivity)
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Symphony No. 9 in D Minor, Op. 125 "Choral": IVc-j. Presto. O Freunde nicht diese Töne – Prestissimo - Recorded 1962
type: MusicRecording
duration: PT17M31S
duration ms: 1051933
explicit: false
by artist: Ludwig van Beethoven
by artist: Gundula Janowitz
by artist: Hilde Rössel Majdan
by artist: Waldemar Kmentt
by artist: Walter Berry
by artist: Wiener Singverein
by artist: Berliner Philharmoniker
by artist: Herbert von Karajan
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 11
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056201688
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/DEF056201688
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
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  date published: 2026-07-02T03:30:09Z
audio: Symphony No. 9 in D Minor, Op. 125 "Choral": IVc-j. Presto. O Freunde nicht diese Töne – Prestissimo - Recorded 1962
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": III. Rondo. Allegro ma non troppo
type: MusicRecording
duration: PT10M36S
duration ms: 636093
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
by artist: Berliner Philharmoniker
by artist: Ferdinand Leitner
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 7
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056101754
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/960117
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056101754
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 0x0ec0c8ffb1de73699859f140e3d49a0cb3ffebdfb2693b6beaa1327962c4104a. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056101754.
  date published: 2026-07-29T14:28:24Z
audio: Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": III. Rondo. Allegro ma non troppo
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  additional property: Tempo (BPM)
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  additional property: Mode (Major/Minor)
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  additional property: Acousticness
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": III. Presto agitato
type: MusicRecording
duration: PT5M30S
duration ms: 330000
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 7
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056500173
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/DEF056500173
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 0xe4baa70d9ac1ac43452659643a8e5b88818f0fb23ae7f4c8d365952b3462a16b. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEF056500173.
  date published: 2026-07-29T13:09:35Z
audio: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": III. Presto agitato
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Symphony No. 7 in A Major, Op. 92: III. Presto - Assai meno presto
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duration: PT8M15S
duration ms: 495000
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by artist: Ludwig van Beethoven
by artist: Wiener Philharmoniker
by artist: Carlos Kleiber
in album: Originals Beethoven Box
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popularity: 27
genre: classical
genre: classical-piano
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: 2026-06-13T13:32:09Z
audio: Symphony No. 7 in A Major, Op. 92: III. Presto - Assai meno presto
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Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": I. Allegro con brio
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explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 6
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400271
additional property: CopyrightID
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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: 2026-07-29T15:38:18Z
audio: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": I. Allegro con brio
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Symphony No. 7 in A Major, Op. 92: IV. Allegro con brio
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duration: PT8M36S
duration ms: 516000
explicit: false
by artist: Ludwig van Beethoven
by artist: Wiener Philharmoniker
by artist: Carlos Kleiber
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 18
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF057601364
additional property: CopyrightID
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additional property: CopyrightRegisteredAt
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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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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-13T13:32:09Z
audio: Symphony No. 7 in A Major, Op. 92: IV. Allegro con brio
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Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": II. Introduzione. Adagio molto
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duration: PT3M5S
duration ms: 185040
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 5
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400272
additional property: CopyrightID
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additional property: CopyrightRegisteredAt
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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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  date published: 2026-07-29T19:35:34Z
audio: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": II. Introduzione. Adagio molto
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Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": III. Rondo. Allegretto moderato – Prestissimo
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duration: PT9M46S
duration ms: 586960
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
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  date published: 1995-01-01
popularity: 5
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400273
additional property: CopyrightID
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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 0x02c37c321462fef795c72776d7e2e18841ad828642608288d221827cde398152. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400273.
  date published: 2026-07-29T19:35:34Z
audio: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": III. Rondo. Allegretto moderato – Prestissimo
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Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": I. Allegro assai
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duration: PT9M52S
duration ms: 592000
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
  type: MusicAlbum
  date published: 1995-01-01
popularity: 5
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400291
additional property: CopyrightID
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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/DEF056400291
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 0x388af80b6abab40c9d1ee6eab763e4d5852c6e6d6d85795a670a5fb6a3415503. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400291.
  date published: 2026-07-08T03:20:19Z
audio: Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": I. Allegro assai
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Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": II. Andante con moto
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duration ms: 360840
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Originals Beethoven Box
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popularity: 4
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightID
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additional property: CopyrightRegisteredAt
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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
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Arrangements or Transfigurations
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Schumann: Papillons; Arabeske; Piano Concerto (Wilhelm Kempff: Complete Decca Recordings, Vol. 5)
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Mozart: Piano Concerto No. 9 'Jeunehomme'; Piano Concerto No. 15 (Wilhelm Kempff: Complete Decca Recordings, Vol. 3)
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Wilhelm Kempff plays Brahms and Mozart
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  audio: Piano Sonata No. 14 in C sharp minor, Op. 271 Moonlight III. Presto agitato
track: Piano Concerto No. 5 in e Flat Major, Op. 73 Emperor I. Allegro
track: Piano Concerto No. 5 in e Flat Major, Op. 73 Emperor II. Adagio un poco mosso
track: Piano Concerto No. 5 in e Flat Major, Op. 73 Emperor III. Rondo Allegro

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Piano Sonata No. 14 in C sharp minor, Op. 271 Moonlight III. Presto agitato
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Piano Concerto No. 5 in e Flat Major, Op. 73 Emperor I. Allegro
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Piano Concerto No. 5 in e Flat Major, Op. 73 Emperor II. Adagio un poco mosso
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track: Piano Sonata No. 30 in E Major, Op. 109: III. Gesangvoll, mit innigster Empfindung. Andante molto cantabile ed espressivo

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Piano Sonata No. 29 in B-Flat Major, Op. 106 "Hammerklavier": III. Adagio sostenuto
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Piano Sonata No. 29 in B-Flat Major, Op. 106 "Hammerklavier": IV. Introduzione. Largo - Fuga. Allegro risoluto
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Piano Sonata No. 30 in E Major, Op. 109: III. Gesangvoll, mit innigster Empfindung. Andante molto cantabile ed espressivo
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Wolfgang Amadeus Mozart: Piano Concertos Nos. 8 & 24, Piano Sonata No. 11, Fantasia No. 3
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    date published: 2026-07-02T03:55:08Z
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  audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Tema
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation I
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation II
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation III
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation IV.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation V.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VI.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VII. Canone all'Ottava
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VIII.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation IX.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation X.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XI.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XII.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XIII.
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XIV. Minore
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XV. Maggiore. Largo
track: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Finale. Alla Fuga. Allegro con brio
track: Impromptu No. 2 in F-Sharp Major, Op. 36
track: 6 Piano Variations in F Major, Op. 34: Thema (Adagio)
track: 6 Piano Variations in F Major, Op. 34: Variation I.
track: 6 Piano Variations in F Major, Op. 34: Variation II. (Allegro ma non troppo)
track: 6 Piano Variations in F Major, Op. 34: Variation III. (Allegretto)
track: 6 Piano Variations in F Major, Op. 34: Variation IV. (Tempo di menuetto)
track: 6 Piano Variations in F Major, Op. 34: Variation V. Marcia (Allegretto)
track: 6 Piano Variations in F Major, Op. 34: Variation VI. Coda (Allegretto)
track: Impromptu No. 3 in G-Flat Major, Op. 51
track: 6 Bagatelles, Op. 126: No. 1 Andante con moto
track: 6 Bagatelles, Op. 126: No. 2 Allegro
track: 6 Bagatelles, Op. 126: No. 3 Andante
track: 6 Bagatelles, Op. 126: No. 4 Presto
track: 6 Bagatelles, Op. 126: 5. Quasi Allegretto
track: 6 Bagatelles, Op. 126: No. 6 Presto - Andante amabile e con moto
track: Fantaisie-impromptu in C-Sharp Minor, Op. 66
track: Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: I. Andante - Allegro - Tempo I
track: Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: II. Allegro molto e vivace
track: Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: III. Adagio con espressione
track: Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: IV. Allegro vivace - Tempo I - Presto
track: Berceuse in D-Flat Major, Op. 57
track: Piano Sonata No. 19 in G Minor, Op. 49, No. 1: I. Andante
track: Piano Sonata No. 19 in G Minor, Op. 49, No. 1: II. Rondo (Allegro)
track: Piano Sonata No. 20 in G Major, Op. 49, No. 2: I. Allegro ma non troppo
track: Piano Sonata No. 20 in G Major, Op. 49, No. 2: II. Tempo di Menuetto
track: Ballade No. 3 in A-Flat Major, Op. 47
track: Piano Sonata No. 2 in B-Flat Minor, Op. 35: I. Grave – Doppio movimento
track: Piano Sonata No. 2 in B-Flat Minor, Op. 35: II. Scherzo – Più lento
track: Piano Sonata No. 2 in B-Flat Minor, Op. 35: III. Marche funèbre. Lento
track: Piano Sonata No. 2 in B-Flat Minor, Op. 35: IV. Finale. Presto
track: Piano Sonata No. 25 in G Major, Op. 79: I. Presto alla tedesca

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date published: 2026-07-02T03:55:08Z

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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-22T12:33:25Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation I
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-06T06:56:49Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation II
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  date published: 2026-07-02T03:55:08Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation III
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15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation IV.
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T19:35:34Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation IV.
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15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation V.
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duration: PT0M46S
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by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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genre: classical
genre: classical-piano
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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: 2026-07-02T03:55:08Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation V.
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15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VI.
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duration: PT0M46S
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by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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genre: classical
genre: classical-piano
genre: chamber-music
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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: 2026-07-02T03:55:08Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VI.
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15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VII. Canone all'Ottava
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-07T16:07:00Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VII. Canone all'Ottava
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15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VIII.
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genre: classical
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation VIII.
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15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation IX.
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genre: classical
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-22T11:35:32Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation IX.
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15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation X.
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additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xbb0ab2822b40ddac66ac35d489f1f7a6dd27cdfd635f2b0e290aaa81ca449d54
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057100013
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0ab2822b40ddac66ac35d489f1f7a6dd27cdfd635f2b0e290aaa81ca449d54. 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/DEF057100013.
  date published: 2026-07-02T03:55:08Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation X.
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 107.472
  additional property: Musical Key
    type: PropertyValue
    value: 11
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.305
  additional property: Energy
    type: PropertyValue
    value: 0.126
  additional property: Speechiness
    type: PropertyValue
    value: 0.05
  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.933
  additional property: Liveness
    type: PropertyValue
    value: 0.255
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.214
  additional property: Loudness (dB)
    type: PropertyValue
    value: -27.486
  additional property: Key Name
    type: PropertyValue
    value: B
  additional property: Mode Name
    type: PropertyValue
    value: Minor

15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XI.
type: MusicRecording
duration: PT0M45S
duration ms: 45693
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF057100014
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-27T06:53:19+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd5bce856d70496ca5e7f708286f539f16553155df7ef70576937474c220c4077
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057100014
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bce856d70496ca5e7f708286f539f16553155df7ef70576937474c220c4077. 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/DEF057100014.
  date published: 2026-07-02T03:55:08Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XI.
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 114.846
  additional property: Musical Key
    type: PropertyValue
    value: 3
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.7
  additional property: Energy
    type: PropertyValue
    value: 0.088
  additional property: Speechiness
    type: PropertyValue
    value: 0.058
  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.941
  additional property: Liveness
    type: PropertyValue
    value: 0.159
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.288
  additional property: Loudness (dB)
    type: PropertyValue
    value: -33.642
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major

15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XII.
type: MusicRecording
duration: PT0M41S
duration ms: 41706
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF057100015
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-22T13:46:29+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xae73cbc83e6fecb46eed4c6f97434ae0342a21683f632dde3db60e051faf35d0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 959137
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/959137
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057100015
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-22T14:03:35Z
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 0xae73cbc83e6fecb46eed4c6f97434ae0342a21683f632dde3db60e051faf35d0. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEF057100015.
  date published: 2026-07-22T14:03:35Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XII.
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 118.509
  additional property: Musical Key
    type: PropertyValue
    value: 3
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.511
  additional property: Energy
    type: PropertyValue
    value: 0.085
  additional property: Speechiness
    type: PropertyValue
    value: 0.038
  additional property: Acousticness
    type: PropertyValue
    value: 0.996
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.818
  additional property: Liveness
    type: PropertyValue
    value: 0.122
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.504
  additional property: Loudness (dB)
    type: PropertyValue
    value: -28.816
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major

15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XIII.
type: MusicRecording
duration: PT0M39S
duration ms: 39626
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF057100016
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-22T14:42:06+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2cdf09b3a3ce437dae14c8a075e5424e56f3012530c34419abe3760a8a390396
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 959145
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/959145
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057100016
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-22T15:39:05Z
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 0x2cdf09b3a3ce437dae14c8a075e5424e56f3012530c34419abe3760a8a390396. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/DEF057100016.
  date published: 2026-07-22T15:39:05Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XIII.
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 162.059
  additional property: Musical Key
    type: PropertyValue
    value: 3
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.408
  additional property: Energy
    type: PropertyValue
    value: 0.253
  additional property: Speechiness
    type: PropertyValue
    value: 0.071
  additional property: Acousticness
    type: PropertyValue
    value: 0.994
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.915
  additional property: Liveness
    type: PropertyValue
    value: 0.113
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.867
  additional property: Loudness (dB)
    type: PropertyValue
    value: -25.35
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major

15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XIV. Minore
type: MusicRecording
duration: PT0M59S
duration ms: 59560
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF057100017
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-29T11:50:59+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x114186e9cdb076ca2b9b15dd0dbb314df23423675003ae0e0ae4f93f5c309020
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960105
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960105
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057100017
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-29T12:35:17Z
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 0x114186e9cdb076ca2b9b15dd0dbb314df23423675003ae0e0ae4f93f5c309020. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEF057100017.
  date published: 2026-07-29T12:35:17Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XIV. Minore
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 100.399
  additional property: Musical Key
    type: PropertyValue
    value: 11
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.312
  additional property: Energy
    type: PropertyValue
    value: 0.007
  additional property: Speechiness
    type: PropertyValue
    value: 0.067
  additional property: Acousticness
    type: PropertyValue
    value: 0.996
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.916
  additional property: Liveness
    type: PropertyValue
    value: 0.114
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.218
  additional property: Loudness (dB)
    type: PropertyValue
    value: -35.07
  additional property: Key Name
    type: PropertyValue
    value: B
  additional property: Mode Name
    type: PropertyValue
    value: Major

15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XV. Maggiore. Largo
type: MusicRecording
duration: PT4M12S
duration ms: 252413
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF057100018
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-27T07:12:09+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8dc3e20e530bb304e9daa0e288bd898a3f03a768d36e14b5a03216dc4deec6e8
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057100018
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc3e20e530bb304e9daa0e288bd898a3f03a768d36e14b5a03216dc4deec6e8. 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/DEF057100018.
  date published: 2026-07-02T03:55:08Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Variation XV. Maggiore. Largo
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 138.816
  additional property: Musical Key
    type: PropertyValue
    value: 3
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.385
  additional property: Energy
    type: PropertyValue
    value: 0.033
  additional property: Speechiness
    type: PropertyValue
    value: 0.044
  additional property: Acousticness
    type: PropertyValue
    value: 0.99
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.917
  additional property: Liveness
    type: PropertyValue
    value: 0.096
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.075
  additional property: Loudness (dB)
    type: PropertyValue
    value: -30.965
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major

15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Finale. Alla Fuga. Allegro con brio
type: MusicRecording
duration: PT4M51S
duration ms: 291386
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF057100019
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-29T13:50:40+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7669eaff3015d58b8e593ad809fd28990775ffc042086d26cc10e323712cb423
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960117
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960117
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057100019
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-29T14:28:24Z
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 0x7669eaff3015d58b8e593ad809fd28990775ffc042086d26cc10e323712cb423. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057100019.
  date published: 2026-07-29T14:28:24Z
audio: 15 Variations and Fugue in E-Flat Major, Op. 35, "Eroica Variations": Finale. Alla Fuga. Allegro con brio
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 132.832
  additional property: Musical Key
    type: PropertyValue
    value: 3
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.339
  additional property: Energy
    type: PropertyValue
    value: 0.093
  additional property: Speechiness
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Impromptu No. 2 in F-Sharp Major, Op. 36
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by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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genre: early-romantic-era
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T11:07:37Z
audio: Impromptu No. 2 in F-Sharp Major, Op. 36
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6 Piano Variations in F Major, Op. 34: Thema (Adagio)
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duration: PT1M22S
duration ms: 82853
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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genre: classical
genre: classical-piano
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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: 2026-07-29T19:35:34Z
audio: 6 Piano Variations in F Major, Op. 34: Thema (Adagio)
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6 Piano Variations in F Major, Op. 34: Variation I.
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duration: PT1M31S
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by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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genre: classical
genre: classical-piano
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T11:07:37Z
audio: 6 Piano Variations in F Major, Op. 34: Variation I.
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6 Piano Variations in F Major, Op. 34: Variation II. (Allegro ma non troppo)
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duration: PT1M5S
duration ms: 65800
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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genre: classical
genre: classical-piano
genre: chamber-music
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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: 2026-07-08T03:20:19Z
audio: 6 Piano Variations in F Major, Op. 34: Variation II. (Allegro ma non troppo)
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6 Piano Variations in F Major, Op. 34: Variation III. (Allegretto)
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duration: PT1M9S
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explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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genre: classical
genre: classical-piano
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-07T16:07:00Z
audio: 6 Piano Variations in F Major, Op. 34: Variation III. (Allegretto)
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6 Piano Variations in F Major, Op. 34: Variation IV. (Tempo di menuetto)
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by artist: Wilhelm Kempff
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genre: classical
genre: classical-piano
genre: chamber-music
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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: 2026-07-08T03:20:19Z
audio: 6 Piano Variations in F Major, Op. 34: Variation IV. (Tempo di menuetto)
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6 Piano Variations in F Major, Op. 34: Variation V. Marcia (Allegretto)
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T03:35:13Z
audio: 6 Piano Variations in F Major, Op. 34: Variation V. Marcia (Allegretto)
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6 Piano Variations in F Major, Op. 34: Variation VI. Coda (Allegretto)
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by artist: Wilhelm Kempff
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genre: classical
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T19:35:34Z
audio: 6 Piano Variations in F Major, Op. 34: Variation VI. Coda (Allegretto)
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Impromptu No. 3 in G-Flat Major, Op. 51
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duration: PT5M42S
duration ms: 342333
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by artist: Frédéric Chopin
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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  date published: 2025-03-03
genre: classical
genre: early-romantic-era
genre: polish-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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824221ee7b3b0b967e317a6726480dfbb4f445a3924780526a0494ad612348ca. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075842007.
  date published: 2026-07-06T06:56:49Z
audio: Impromptu No. 3 in G-Flat Major, Op. 51
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6 Bagatelles, Op. 126: No. 1 Andante con moto
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duration: PT3M8S
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explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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  date published: 2025-03-03
genre: classical
genre: classical-piano
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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: 2026-07-29T13:09:35Z
audio: 6 Bagatelles, Op. 126: No. 1 Andante con moto
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6 Bagatelles, Op. 126: No. 2 Allegro
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duration: PT1M53S
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by artist: Wilhelm Kempff
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genre: classical
genre: classical-piano
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T02:05:19Z
audio: 6 Bagatelles, Op. 126: No. 2 Allegro
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6 Bagatelles, Op. 126: No. 3 Andante
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explicit: false
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by artist: Wilhelm Kempff
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genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400363
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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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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: 6 Bagatelles, Op. 126: No. 3 Andante
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6 Bagatelles, Op. 126: No. 4 Presto
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duration: PT3M28S
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by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightRegisteredAt
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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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subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03b449c645f9ba78aaa843219f3cfd49fc89eac74354c8290a51c986dd2c3f5. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/DEF056400364.
  date published: 2026-07-07T16:54:37Z
audio: 6 Bagatelles, Op. 126: No. 4 Presto
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6 Bagatelles, Op. 126: 5. Quasi Allegretto
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duration: PT1M25S
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by artist: Wilhelm Kempff
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genre: classical
genre: classical-piano
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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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6 Bagatelles, Op. 126: No. 6 Presto - Andante amabile e con moto
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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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Fantaisie-impromptu in C-Sharp Minor, Op. 66
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T19:35:34Z
audio: Fantaisie-impromptu in C-Sharp Minor, Op. 66
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Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: I. Andante - Allegro - Tempo I
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T22:48:59Z
audio: Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: I. Andante - Allegro - Tempo I
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Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: II. Allegro molto e vivace
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T03:35:13Z
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Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: III. Adagio con espressione
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-07T14:41:13Z
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Piano Sonata No. 13 in E-Flat Major, Op. 27, No. 1: IV. Allegro vivace - Tempo I - Presto
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T14:53:07Z
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Berceuse in D-Flat Major, Op. 57
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duration ms: 286466
explicit: false
by artist: Frédéric Chopin
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
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  date published: 2025-03-03
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: GBF075842009
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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
  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 0x18b2c6ecbad2494ca731ab32400be68341f562eb54f2b619647fcd424b9c9a2b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBF075842009.
  date published: 2026-07-30T01:32:48Z
audio: Berceuse in D-Flat Major, Op. 57
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Piano Sonata No. 19 in G Minor, Op. 49, No. 1: I. Andante
type: MusicRecording
duration: PT4M5S
duration ms: 245840
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400251
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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/DEF056400251
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T01:32:48Z
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 0x04936f46fcbadc730b9fc8a83e50e204b2a0b38f2803a71034197331478ea054. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DEF056400251.
  date published: 2026-07-30T01:32:48Z
audio: Piano Sonata No. 19 in G Minor, Op. 49, No. 1: I. Andante
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Piano Sonata No. 19 in G Minor, Op. 49, No. 1: II. Rondo (Allegro)
type: MusicRecording
duration: PT3M52S
duration ms: 232133
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400252
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
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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 0x88fae6ef91a28a027f9e5ea2cd03dbd451fe24b75679deb8e318597cfab678af. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400252.
  date published: 2026-07-30T02:05:19Z
audio: Piano Sonata No. 19 in G Minor, Op. 49, No. 1: II. Rondo (Allegro)
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Piano Sonata No. 20 in G Major, Op. 49, No. 2: I. Allegro ma non troppo
type: MusicRecording
duration: PT4M32S
duration ms: 272973
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400261
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: 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 0x6c39d64c1241b6684203eada38aaea60a057a2ebb313b8494e4211b444fe7774. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEF056400261.
  date published: 2026-07-30T22:27:30Z
audio: Piano Sonata No. 20 in G Major, Op. 49, No. 2: I. Allegro ma non troppo
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Piano Sonata No. 20 in G Major, Op. 49, No. 2: II. Tempo di Menuetto
type: MusicRecording
duration: PT3M51S
duration ms: 231080
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400262
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
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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 0x23a358e051e1adc299d230a24b78f8034b9e9ecfc6b8edf86a30255f2bf61422. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DEF056400262.
  date published: 2026-07-30T19:11:09Z
audio: Piano Sonata No. 20 in G Major, Op. 49, No. 2: II. Tempo di Menuetto
  type: AudioObject
  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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    type: PropertyValue
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  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Ballade No. 3 in A-Flat Major, Op. 47
type: MusicRecording
duration: PT7M2S
duration ms: 422106
explicit: false
by artist: Frédéric Chopin
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: GBF075842017
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
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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 0xe27a44b324450ebb5fa2f69e0f63360f0aa0665a4d29f25a99d2d3989cd5813b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075842017.
  date published: 2026-07-30T15:42:38Z
audio: Ballade No. 3 in A-Flat Major, Op. 47
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  additional property: Tempo (BPM)
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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: Valence (Positivity)
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  additional property: Loudness (dB)
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Piano Sonata No. 2 in B-Flat Minor, Op. 35: I. Grave – Doppio movimento
type: MusicRecording
duration: PT7M14S
duration ms: 434333
explicit: false
by artist: Frédéric Chopin
by artist: Wilhelm Kempff
in album: "Kempff Plays": Beethoven & Chopin
  type: MusicAlbum
  date published: 2025-03-03
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: GBF075842001
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: 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
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83756d82ed2402bc4f280b47a00b170900d676db12c7a6a794fb442f692c71a. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/GBF075842001.
  date published: 2026-07-30T07:51:46Z
audio: Piano Sonata No. 2 in B-Flat Minor, Op. 35: I. Grave – Doppio movimento
  type: AudioObject
  additional property: Tempo (BPM)
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Piano Sonata No. 2 in B-Flat Minor, Op. 35: II. Scherzo – Più lento
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Piano Sonata No. 2 in B-Flat Minor, Op. 35: III. Marche funèbre. Lento
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Piano Sonata No. 2 in B-Flat Minor, Op. 35: IV. Finale. Presto
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Piano Sonata No. 25 in G Major, Op. 79: I. Presto alla tedesca
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subject of: OpenTimestamps Proof of Existence
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Wilhelm Kempff: Lieder
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Liszt: Piano Concerto No. 1; Piano Concerto No. 2 (Wilhelm Kempff: Complete Decca Recordings, Vol. 9)
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Liszt: Années de pèlerinage; Légendes (Wilhelm Kempff: Complete Decca Recordings, Vol. 8)
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J.S. Bach; Handel; F. Couperin; Rameau; Beethoven (Wilhelm Kempff: Complete Decca Recordings, Vol. 1)
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Chopin: Piano Sonata No. 3; Ballade No. 3; Andante spianato et Grande polonaise brillante; Fantaisie; Polonaise-fantaisie (Wilhelm Kempff: Complete Decca Recordings, Vol. 7)
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Chopin: Piano Sonata No. 2; Impromptus; Berceuse; Barcarolle (Wilhelm Kempff: Complete Decca Recordings, Vol. 6)
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-31T17:29:52Z
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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: 2026-07-08T03:20:19Z
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  subject of: OpenTimestamps Proof of Existence
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track: Cello Sonata No. 3 in A Major, Op. 69: II. Scherzo. Allegro molto
track: Cello Sonata No. 3 in A Major, Op. 69: III. Adagio cantabile - Allegro vivace
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OpenTimestamps Proof of Existence
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date published: 2026-07-31T00:26:26Z

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Cello Sonata No. 3 in A Major, Op. 69: II. Scherzo. Allegro molto
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Cello Sonata No. 3 in A Major, Op. 69: III. Adagio cantabile - Allegro vivace
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Cello Sonata No. 3 in A Major, Op. 69: IV. Allegro vivace
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Violin Sonata No. 9 in A Major, Op. 47 "Kreutzer": I. Adagio sostenuto - Presto
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Violin Sonata No. 9 in A Major, Op. 47 "Kreutzer": II. Andante con variazioni
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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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    date published: 2026-07-08T03:20:19Z
  audio: Nun komm, der Heiden Heiland, BWV 659 (Arr. Kempff for Piano)
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track: Herz und Mund und Tat und Leben, BWV 147: Jesus bleibet meine Freude (Arr. Kempff for Piano)
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  by artist: Wilhelm Kempff
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  genre: classical
  genre: classical-piano
  genre: early-music
  genre: baroque
  genre: chamber-music
  genre: concerto
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  additional property: OTSVerificationAPI
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  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Herz und Mund und Tat und Leben, BWV 147: Jesus bleibet meine Freude (Arr. Kempff for Piano)
track: In dulci jubilo, BWV 729 (Arr. Kempff for Piano)
track: Nun freut euch, liebe Christen g'mein, BWV 734 (Arr. Kempff for Piano)
track: Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (Arr. Kempff for Piano)

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CopyrightChainExplorerURL
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OTSBitcoinBlock
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OTSBitcoinBlockVerifyURL
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OTSVerificationAPI
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value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075310930

OTSTimestamp
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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 0x9c95c446c76e14ddf1dd0f04a6d4d636a6de059a714cccc1b1331f563d1f01fd. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBF075310930.
date published: 2026-07-31T19:53:13Z

Herz und Mund und Tat und Leben, BWV 147: Jesus bleibet meine Freude (Arr. Kempff for Piano)
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additional property: Acousticness
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additional property: Liveness
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additional property: Valence (Positivity)
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In dulci jubilo, BWV 729 (Arr. Kempff for Piano)
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duration: PT2M6S
duration ms: 126113
explicit: false
by artist: Johann Sebastian Bach
by artist: Wilhelm Kempff
in album: A Bach Recital (Wilhelm Kempff: Complete Decca Recordings, Vol. 2)
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genre: classical
genre: classical-piano
genre: early-music
genre: baroque
genre: chamber-music
genre: concerto
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additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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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 0x0aaa4e081d9bff7f49dad5a41dc24484e3b865a8ac611b268104e5f6110e9972. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBBBA5350132.
  date published: 2026-07-08T03:39:04Z
audio: In dulci jubilo, BWV 729 (Arr. Kempff for Piano)
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Nun freut euch, liebe Christen g'mein, BWV 734 (Arr. Kempff for Piano)
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duration: PT1M45S
duration ms: 105668
explicit: false
by artist: Johann Sebastian Bach
by artist: Wilhelm Kempff
in album: A Bach Recital (Wilhelm Kempff: Complete Decca Recordings, Vol. 2)
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genre: classical
genre: classical-piano
genre: early-music
genre: baroque
genre: chamber-music
genre: concerto
isrc code: GBBBA5350133
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
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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 0x225b726af53efd7aa1afb7370d0f69d4c39010cc8b6579ef9782dc02e398a3aa. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBBBA5350133.
  date published: 2026-07-31T21:25:57Z
audio: Nun freut euch, liebe Christen g'mein, BWV 734 (Arr. Kempff for Piano)
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Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (Arr. Kempff for Piano)
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duration: PT4M17S
duration ms: 257972
explicit: false
by artist: Johann Sebastian Bach
by artist: Wilhelm Kempff
in album: A Bach Recital (Wilhelm Kempff: Complete Decca Recordings, Vol. 2)
  type: MusicAlbum
  date published: 2022-05-13
genre: classical
genre: classical-piano
genre: early-music
genre: baroque
genre: chamber-music
genre: concerto
isrc code: GBBBA5350134
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
additional property: CopyrightChainExplorerURL
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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 0x0e482adf425d34125cc7b38ef0085db722876f9477a297ca4a066e0947ef9e80. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5350134.
  date published: 2026-07-31T02:19:15Z
audio: Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (Arr. Kempff for Piano)
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Bach, Mozart, Schubert & Schumann: Works for Piano
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date published: 2022-01-14

Beethoven: Op.27 & Op.109 - Chopin: Nocturne Op.9 No.3 - Schubert: Impromptu Op.90 No.4 - Schumann: Kreisleriana, Op.16 (Previously Unreleased Piano Recordings)
type: MusicAlbum
date published: 2021-05-21

Beethoven: Sonatas Nos. 7 - 12
type: MusicAlbum
date published: 2019-09-13
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  duration: PT8M44S
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  by artist: Ludwig van Beethoven
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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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    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 0xefb5914ed112008d01824baed8c21c9ed0211514115e11bc7786813d41c09a27. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEF056400182.
    date published: 2026-07-31T18:48:12Z
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track: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": I. Grave (Allegro di molto e con brio)
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  genre: classical
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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
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track: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": III. Rondo (Allegro)

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date published: 2026-07-29T23:52:38Z

Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio cantabile
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subject of: OpenTimestamps Proof of Existence
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  subject of: 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: 2026-07-31T18:48:12Z
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track: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": II. Introduzione (Adagio molto)
track: Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": I. Allegro assai
track: Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": III. Allegro ma non troppo
track: Piano Sonata No. 26 in E-Flat Major, Op. 81a "Les Adieux": I. Das Lebewohl (Adagio - Allegro)

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OpenTimestamps Proof of Existence
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date published: 2026-07-31T06:42:11Z

Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": I. Allegro con brio
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Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": II. Introduzione (Adagio molto)
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T12:24:41Z
audio: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": II. Introduzione (Adagio molto)
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Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": I. Allegro assai
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  date published: 2026-07-08T03:20:19Z
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Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": III. Allegro ma non troppo
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  date published: 2026-07-31T18:48:12Z
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Piano Sonata No. 26 in E-Flat Major, Op. 81a "Les Adieux": I. Das Lebewohl (Adagio - Allegro)
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track: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
track: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": II. Allegretto
track: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": III. Presto agitato
track: Piano Sonata No. 15 in D Major, Op. 28 -"Pastorale": II. Andante
track: Piano Sonata No. 17 in D Minor, Op. 31 No. 2 "The Tempest": I. Largo - Allegro
track: Piano Sonata No. 17 in D Minor, Op. 31 No. 2 "The Tempest": III. Allegretto

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OpenTimestamps Proof of Existence
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
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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 0x49a0d488b99dd25deb0abe7142a90645f76f054fcb2f844679406eb2de0834b8. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEF056500171.
  date published: 2026-07-07T16:07:00Z
audio: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": II. Allegretto
type: MusicRecording
duration: PT2M19S
duration ms: 139800
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 13 - 19
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  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056500172
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additional property: CopyrightRegisteredAt
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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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  date published: 2026-07-08T03:20:19Z
audio: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": II. Allegretto
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": III. Presto agitato
type: MusicRecording
duration: PT5M35S
duration ms: 335826
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 13 - 19
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056500173
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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
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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 0xe4baa70d9ac1ac43452659643a8e5b88818f0fb23ae7f4c8d365952b3462a16b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056500173.
  date published: 2026-07-29T19:35:34Z
audio: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": III. Presto agitato
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Piano Sonata No. 15 in D Major, Op. 28 -"Pastorale": II. Andante
type: MusicRecording
duration: PT6M20S
duration ms: 380666
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 13 - 19
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056500182
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
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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 0xc842d2ad86cb3683007078e87730e7a00d4e84859a8f9672fd42d2e70e96edf4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056500182.
  date published: 2026-07-08T03:20:19Z
audio: Piano Sonata No. 15 in D Major, Op. 28 -"Pastorale": II. Andante
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Piano Sonata No. 17 in D Minor, Op. 31 No. 2 "The Tempest": I. Largo - Allegro
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duration: PT8M22S
duration ms: 502333
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 13 - 19
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genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400231
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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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
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  date published: 2026-07-08T03:22:41Z
audio: Piano Sonata No. 17 in D Minor, Op. 31 No. 2 "The Tempest": I. Largo - Allegro
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Piano Sonata No. 17 in D Minor, Op. 31 No. 2 "The Tempest": III. Allegretto
type: MusicRecording
duration: PT7M8S
duration ms: 428240
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 13 - 19
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  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400233
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: OTSHash
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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 0x96a45656572378973d5cbfb4158056712953361c5c290ceebfb2e573a5ebc760. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400233.
  date published: 2026-07-29T19:35:34Z
audio: Piano Sonata No. 17 in D Minor, Op. 31 No. 2 "The Tempest": III. Allegretto
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Beethoven: Sonatas Nos. 1 - 6
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date published: 2019-09-13
track: Piano Sonata No. 1 in F Minor, Op. 2 No. 1: I. Allegro
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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
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b03b3773cd90143c59bd74628faa61e8f88878972032385d9b03924a29f380. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEF056400122.
    date published: 2026-07-29T13:09:35Z
  audio: Piano Sonata No. 1 in F Minor, Op. 2 No. 1: I. Allegro
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  genre: classical
  genre: classical-piano
  genre: chamber-music
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  additional property: OTSVerificationAPI
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    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400121
  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 0x2a0454ad31a6435ed549e8982bf283c2840e40a4fad1494dbf58902e852a76c7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400121.
    date published: 2026-07-30T15:42:38Z
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  by artist: Ludwig van Beethoven
  by artist: Wilhelm Kempff
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  genre: classical
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  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
  additional property: OTSTimestamp
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  subject of: OpenTimestamps Proof of Existence
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track: Piano Sonata No. 1 in F Minor, Op. 2 No. 1: IV. Prestissimo
track: Piano Sonata No. 2 in A Major, Op. 2 No. 2: I. Allegro vivace
track: Piano Sonata No. 2 in A Major, Op. 2 No. 2: II. Largo appassionato
track: Piano Sonata No. 2 in A Major, Op. 2 No. 2: III. Scherzo (Allegretto)
track: Piano Sonata No. 2 in A Major, Op. 2 No. 2: IV. Rondo (Grazioso)
track: Piano Sonata No. 3 in C Major, Op. 2 No. 3: I. Allegro con brio
track: Piano Sonata No. 3 in C Major, Op. 2 No. 3: II. Adagio
track: Piano Sonata No. 3 in C Major, Op. 2 No. 3: III. Scherzo. Allegro
track: Piano Sonata No. 3 in C Major, Op. 2 No. 3: IV. Allegro assai
track: Piano Sonata No. 4 in E-Flat Major, Op. 7: I. Allegro molto e con brio
track: Piano Sonata No. 5 in C Minor, Op. 10 No. 1: II. Adagio molto
track: Piano Sonata No. 6 in F Major, Op. 10 No. 2: II. Allegretto
track: Piano Sonata No. 6 in F Major, Op. 10 No. 2: III. Presto

CopyrightChainExplorerURL
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value: https://explorer.copyrightchains.com/tx/0xe5ff73d24800b1ef6e96a8b88efa26635ed4b9a8de95ba07bb5d071e2753b9a5

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OTSBitcoinBlock
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OTSBitcoinBlockVerifyURL
type: PropertyValue
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OTSVerificationAPI
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OTSTimestamp
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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 0xe5ff73d24800b1ef6e96a8b88efa26635ed4b9a8de95ba07bb5d071e2753b9a5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400123.
date published: 2026-07-30T09:57:33Z

Piano Sonata No. 1 in F Minor, Op. 2 No. 1: III. Menuetto (Allegretto)
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: 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: 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 Sonata No. 1 in F Minor, Op. 2 No. 1: IV. Prestissimo
type: MusicRecording
duration: PT5M2S
duration ms: 302493
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400124
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/DEF056400124
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 0x90bfc37b615d1f1085bff2137db223ac730d4b5e091a98d496b951326eb4563a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400124.
  date published: 2026-07-30T10:42:33Z
audio: Piano Sonata No. 1 in F Minor, Op. 2 No. 1: IV. Prestissimo
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  additional property: Tempo (BPM)
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Piano Sonata No. 2 in A Major, Op. 2 No. 2: I. Allegro vivace
type: MusicRecording
duration: PT7M13S
duration ms: 433066
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400131
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/DEF056400131
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 0x8f786dfa4519b31d3bf26b0ef1f997211ea4bb90fe054f573a6d5170887f704e. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400131.
  date published: 2026-07-31T10:20:10Z
audio: Piano Sonata No. 2 in A Major, Op. 2 No. 2: I. Allegro vivace
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Piano Sonata No. 2 in A Major, Op. 2 No. 2: II. Largo appassionato
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duration: PT6M40S
duration ms: 400160
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400132
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
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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
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e46cd81de8024fcc85477abea8805a38f0c0fdb24922361121676b7d6a75d3. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400132.
  date published: 2026-07-31T06:42:11Z
audio: Piano Sonata No. 2 in A Major, Op. 2 No. 2: II. Largo appassionato
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Piano Sonata No. 2 in A Major, Op. 2 No. 2: III. Scherzo (Allegretto)
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duration: PT3M23S
duration ms: 203280
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
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genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400133
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
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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 0x773d476ff662800da3992ed2c71f7ca9e59300a5a2b0eda944e1dec2c93d08a5. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEF056400133.
  date published: 2026-07-31T20:22:46Z
audio: Piano Sonata No. 2 in A Major, Op. 2 No. 2: III. Scherzo (Allegretto)
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Piano Sonata No. 2 in A Major, Op. 2 No. 2: IV. Rondo (Grazioso)
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explicit: false
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in album: Beethoven: Sonatas Nos. 1 - 6
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genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400134
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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  value: 2026-07-31T03:15:04Z
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 0xf5c839ea22ef1196ee8d8504486fec6898f34df0d6ae4e24e3fe15007d22a3db. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEF056400134.
  date published: 2026-07-31T03:15:04Z
audio: Piano Sonata No. 2 in A Major, Op. 2 No. 2: IV. Rondo (Grazioso)
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  additional property: Tempo (BPM)
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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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    value: 0.993
  additional property: Instrumentalness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.828
  additional property: Key Name
    type: PropertyValue
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  additional property: Mode Name
    type: PropertyValue
    value: Major

Piano Sonata No. 3 in C Major, Op. 2 No. 3: I. Allegro con brio
type: MusicRecording
duration: PT9M53S
duration ms: 593066
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400141
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T03:56:56+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x19ad7b83933f21f0be9ad3e2f1c3ac7c751eb48e27257e6870be5fcec8611e98
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 960344
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960344
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400141
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T04:14:58Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ad7b83933f21f0be9ad3e2f1c3ac7c751eb48e27257e6870be5fcec8611e98. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400141.
  date published: 2026-07-31T04:14:58Z
audio: Piano Sonata No. 3 in C Major, Op. 2 No. 3: I. Allegro con brio
  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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    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.388
  additional property: Energy
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    value: 0.062
  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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    value: 0.334
  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.498
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

Piano Sonata No. 3 in C Major, Op. 2 No. 3: II. Adagio
type: MusicRecording
duration: PT7M4S
duration ms: 424280
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400142
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T02:59:21+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2fbf434a817d272e17e728c7f7c8e562e66424cf13280953441fab0c6c33ed63
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960340
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960340
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400142
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T03:15:04Z
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 0x2fbf434a817d272e17e728c7f7c8e562e66424cf13280953441fab0c6c33ed63. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEF056400142.
  date published: 2026-07-31T03:15:04Z
audio: Piano Sonata No. 3 in C Major, Op. 2 No. 3: II. Adagio
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 120.326
  additional property: Musical Key
    type: PropertyValue
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  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.384
  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.932
  additional property: Liveness
    type: PropertyValue
    value: 0.1
  additional property: Valence (Positivity)
    type: PropertyValue
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -33.841
  additional property: Key Name
    type: PropertyValue
    value: E
  additional property: Mode Name
    type: PropertyValue
    value: Major

Piano Sonata No. 3 in C Major, Op. 2 No. 3: III. Scherzo. Allegro
type: MusicRecording
duration: PT3M19S
duration ms: 199066
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400143
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-08T00:16:58+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x4d7bbecd96954f078425bc4b1fdf4e48ac70ad3375905c1f7873732cea63f1b9
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/DEF056400143
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:22:41Z
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 0x4d7bbecd96954f078425bc4b1fdf4e48ac70ad3375905c1f7873732cea63f1b9. 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/DEF056400143.
  date published: 2026-07-08T03:22:41Z
audio: Piano Sonata No. 3 in C Major, Op. 2 No. 3: III. Scherzo. Allegro
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 133.526
  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: 0.493
  additional property: Energy
    type: PropertyValue
    value: 0.051
  additional property: Speechiness
    type: PropertyValue
    value: 0.047
  additional property: Acousticness
    type: PropertyValue
    value: 0.994
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.888
  additional property: Liveness
    type: PropertyValue
    value: 0.102
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.694
  additional property: Loudness (dB)
    type: PropertyValue
    value: -28.213
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Piano Sonata No. 3 in C Major, Op. 2 No. 3: IV. Allegro assai
type: MusicRecording
duration: PT5M23S
duration ms: 323720
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400144
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T22:32:44+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x439a727980de9f72a87252a89e8b6c318d45bda032962a98470d26f62f9a023e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960478
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960478
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400144
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T23:30:38Z
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 0x439a727980de9f72a87252a89e8b6c318d45bda032962a98470d26f62f9a023e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400144.
  date published: 2026-07-31T23:30:38Z
audio: Piano Sonata No. 3 in C Major, Op. 2 No. 3: IV. Allegro assai
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 130.89
  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: 0.41
  additional property: Energy
    type: PropertyValue
    value: 0.091
  additional property: Speechiness
    type: PropertyValue
    value: 0.045
  additional property: Acousticness
    type: PropertyValue
    value: 0.992
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.882
  additional property: Liveness
    type: PropertyValue
    value: 0.083
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.49
  additional property: Loudness (dB)
    type: PropertyValue
    value: -27.989
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Piano Sonata No. 4 in E-Flat Major, Op. 7: I. Allegro molto e con brio
type: MusicRecording
duration: PT9M3S
duration ms: 543973
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400151
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-08-01T00:26:05+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x84b0a67dc577ad09150ce73ede31358d754565db3bff6a28aeee116180e573b1
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960489
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960489
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400151
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-08-01T00:40:43Z
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 0x84b0a67dc577ad09150ce73ede31358d754565db3bff6a28aeee116180e573b1. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEF056400151.
  date published: 2026-08-01T00:40:43Z
audio: Piano Sonata No. 4 in E-Flat Major, Op. 7: I. Allegro molto e con brio
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 167.216
  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: 0.311
  additional property: Energy
    type: PropertyValue
    value: 0.107
  additional property: Speechiness
    type: PropertyValue
    value: 0.044
  additional property: Acousticness
    type: PropertyValue
    value: 0.994
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.888
  additional property: Liveness
    type: PropertyValue
    value: 0.122
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.208
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.789
  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Piano Sonata No. 5 in C Minor, Op. 10 No. 1: II. Adagio molto
type: MusicRecording
duration: PT7M27S
duration ms: 447800
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
  type: MusicAlbum
  date published: 2019-09-13
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056400162
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T21:56:44+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2cc2d41c920c0ea72a2bc11113d8bdaa55ac0687b18f200dfe2f4ad1920bd264
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960473
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960473
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056400162
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T22:27:44Z
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 0x2cc2d41c920c0ea72a2bc11113d8bdaa55ac0687b18f200dfe2f4ad1920bd264. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEF056400162.
  date published: 2026-07-31T22:27:44Z
audio: Piano Sonata No. 5 in C Minor, Op. 10 No. 1: II. Adagio molto
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 171.891
  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: 0.365
  additional property: Energy
    type: PropertyValue
    value: 0.006
  additional property: Speechiness
    type: PropertyValue
    value: 0.062
  additional property: Acousticness
    type: PropertyValue
    value: 0.993
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.884
  additional property: Liveness
    type: PropertyValue
    value: 0.141
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.205
  additional property: Loudness (dB)
    type: PropertyValue
    value: -32.755
  additional property: Key Name
    type: PropertyValue
    value: Ab
  additional property: Mode Name
    type: PropertyValue
    value: Major

Piano Sonata No. 6 in F Major, Op. 10 No. 2: II. Allegretto
type: MusicRecording
duration: PT3M32S
duration ms: 212386
explicit: false
by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
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genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  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
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  date published: 2026-08-01T02:22:04Z
audio: Piano Sonata No. 6 in F Major, Op. 10 No. 2: II. Allegretto
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by artist: Wilhelm Kempff
in album: Beethoven: Sonatas Nos. 1 - 6
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genre: classical
genre: classical-piano
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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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T19:53:13Z
audio: Piano Sonata No. 6 in F Major, Op. 10 No. 2: III. Presto
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Schumann, Beethoven & Brahms: Works for Solo Piano (Live)
type: MusicAlbum
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Wilhelm Kempff: Piano Recital 1962 (Live)
type: MusicAlbum
date published: 2019-02-08

Mozart: Works for Piano
type: MusicAlbum
date published: 2018-10-05

Schubert: Piano Sonatas Nos. 16 & 21
type: MusicAlbum
date published: 2018-08-17
track: Piano Sonata No. 16 in A Minor, D. 845: I. Moderato
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  duration: PT11M2S
  duration ms: 662840
  explicit: false
  by artist: Franz Schubert
  by artist: Wilhelm Kempff
  in album: Schubert: Piano Sonatas Nos. 16 & 21
    type: MusicAlbum
    date published: 2018-08-17
  genre: classical
  genre: classical-piano
  genre: chamber-music
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  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: 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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    date published: 2026-07-31T13:04:34Z
  audio: Piano Sonata No. 16 in A Minor, D. 845: I. Moderato
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    additional property: Loudness (dB)
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Kempff plays Bach
type: MusicAlbum
date published: 2018-08-17
track: Chromatic Fantasia and Fugue in D Minor, BWV 903
  type: MusicRecording
  duration: PT12M44S
  duration ms: 764346
  explicit: false
  by artist: Johann Sebastian Bach
  by artist: Wilhelm Kempff
  in album: Kempff plays Bach
    type: MusicAlbum
    date published: 2018-08-17
  genre: classical
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  genre: early-music
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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
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104118655bdc766e2907c26e6a925ba9ec8391fb4fc4fb2ae25a9a60eefebe8a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5350120.
    date published: 2026-07-31T00:26:26Z
  audio: Chromatic Fantasia and Fugue in D Minor, BWV 903
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    additional property: Acousticness
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track: Nun komm, der Heiden Heiland, BWV 659 (Arr. Kempff for Piano)
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  by artist: Wilhelm Kempff
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    date published: 2018-08-17
  genre: classical
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  genre: early-music
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    type: PropertyValue
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075310920
  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
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    date published: 2026-07-08T03:20:19Z
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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
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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: Valence (Positivity)
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  by artist: Johann Sebastian Bach
  by artist: Wilhelm Kempff
  in album: Kempff plays Bach
    type: MusicAlbum
    date published: 2018-08-17
  genre: classical
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  genre: early-music
  genre: baroque
  genre: chamber-music
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  additional property: CopyrightID
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  additional property: CopyrightRegisteredAt
  additional property: CopyrightChainExplorerURL
  additional property: OTSHash
  additional property: OTSBitcoinBlock
  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
  additional property: OTSTimestamp
  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Herz und Mund und Tat und Leben, BWV 147: Jesus bleibet meine Freude (Arr. Kempff for Piano)
track: Herzlich tut mich verlangen, BWV 727 (Arr. Kempff for Piano)
track: In dulci jubilo, BWV 729 (Arr. Kempff for Piano)
track: Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (Arr. Kempff for Piano)
track: Wachet auf! Ruft uns die Stimme, BWV 140 (Arr. Kempff for Piano)
track: Harpsichord Suite No. 5 in E Major, HWV 430 "The Harmonious Blacksmith": IV. Air con variazioni
track: Harpsichord Suite No. 1 in B-Flat Major (Set II), HWV 434: Minuet (Arr. Kempff for Piano)
track: Troisième livre de pièces de clavecin / Ordre XIV in D Major: 7. Le carillon de Cithére
track: Suite in E Minor, RCT 2: 5. Le rappel des oiseaux (Arr. Kempff for Piano)
track: Bagatelle in C Minor, WoO 52
track: Bagatelle No. 25 in A Minor, WoO 59 "Für Elise"

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CopyrightRegisteredAt
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OTSHash
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OTSBitcoinBlock
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value: 960207

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/960207

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075310930

OTSTimestamp
type: PropertyValue
value: 2026-07-30T04:47:22Z

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 0x9c95c446c76e14ddf1dd0f04a6d4d636a6de059a714cccc1b1331f563d1f01fd. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBF075310930.
date published: 2026-07-30T04:47:22Z

Herz und Mund und Tat und Leben, BWV 147: Jesus bleibet meine Freude (Arr. Kempff for Piano)
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additional property: Musical Key
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additional property: Valence (Positivity)
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Herzlich tut mich verlangen, BWV 727 (Arr. Kempff for Piano)
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by artist: Wilhelm Kempff
in album: Kempff plays Bach
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genre: classical
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genre: early-music
genre: baroque
genre: chamber-music
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additional property: CopyrightRegisteredAt
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  value: https://explorer.copyrightchains.com/tx/0x391b815627847cb491f9076aeb63a1e6fca5f9fe92c15374b225130164897936
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/GBBBA5350131
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 0x391b815627847cb491f9076aeb63a1e6fca5f9fe92c15374b225130164897936. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5350131.
  date published: 2026-07-08T03:20:19Z
audio: Herzlich tut mich verlangen, BWV 727 (Arr. Kempff for Piano)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 119.851
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.428
  additional property: Energy
    type: PropertyValue
    value: 0.003
  additional property: Speechiness
    type: PropertyValue
    value: 0.043
  additional property: Acousticness
    type: PropertyValue
    value: 0.996
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.934
  additional property: Liveness
    type: PropertyValue
    value: 0.071
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.353
  additional property: Loudness (dB)
    type: PropertyValue
    value: -41.329
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

In dulci jubilo, BWV 729 (Arr. Kempff for Piano)
type: MusicRecording
duration: PT2M1S
duration ms: 121133
explicit: false
by artist: Johann Sebastian Bach
by artist: Wilhelm Kempff
in album: Kempff plays Bach
  type: MusicAlbum
  date published: 2018-08-17
genre: classical
genre: classical-piano
genre: early-music
genre: baroque
genre: chamber-music
genre: concerto
isrc code: GBBBA5350132
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T12:30:20+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0aaa4e081d9bff7f49dad5a41dc24484e3b865a8ac611b268104e5f6110e9972
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/GBBBA5350132
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 0x0aaa4e081d9bff7f49dad5a41dc24484e3b865a8ac611b268104e5f6110e9972. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5350132.
  date published: 2026-07-08T03:20:19Z
audio: In dulci jubilo, BWV 729 (Arr. Kempff for Piano)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 133.25
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.389
  additional property: Energy
    type: PropertyValue
    value: 0.014
  additional property: Speechiness
    type: PropertyValue
    value: 0.041
  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.919
  additional property: Liveness
    type: PropertyValue
    value: 0.104
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.567
  additional property: Loudness (dB)
    type: PropertyValue
    value: -37.593
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (Arr. Kempff for Piano)
type: MusicRecording
duration: PT4M17S
duration ms: 257973
explicit: false
by artist: Johann Sebastian Bach
by artist: Wilhelm Kempff
in album: Kempff plays Bach
  type: MusicAlbum
  date published: 2018-08-17
genre: classical
genre: classical-piano
genre: early-music
genre: baroque
genre: chamber-music
genre: concerto
isrc code: GBBBA5350134
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T14:02:45+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0e482adf425d34125cc7b38ef0085db722876f9477a297ca4a066e0947ef9e80
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960264
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960264
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5350134
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T14:36:16Z
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 0x0e482adf425d34125cc7b38ef0085db722876f9477a297ca4a066e0947ef9e80. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5350134.
  date published: 2026-07-30T14:36:16Z
audio: Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (Arr. Kempff for Piano)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 114.292
  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: 0.395
  additional property: Energy
    type: PropertyValue
    value: 0.009
  additional property: Speechiness
    type: PropertyValue
    value: 0.037
  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.923
  additional property: Liveness
    type: PropertyValue
    value: 0.067
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.335
  additional property: Loudness (dB)
    type: PropertyValue
    value: -36.611
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Wachet auf! Ruft uns die Stimme, BWV 140 (Arr. Kempff for Piano)
type: MusicRecording
duration: PT5M5S
duration ms: 305186
explicit: false
by artist: Johann Sebastian Bach
by artist: Wilhelm Kempff
in album: Kempff plays Bach
  type: MusicAlbum
  date published: 2018-08-17
genre: classical
genre: classical-piano
genre: early-music
genre: baroque
genre: chamber-music
genre: concerto
isrc code: GBF075310940
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T17:52:36+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xee7b35d78201cdf9becba3df67e749ae742dbfb14f44e5cf6049e2aa894d3046
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960291
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960291
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075310940
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T18:23:33Z
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 0xee7b35d78201cdf9becba3df67e749ae742dbfb14f44e5cf6049e2aa894d3046. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075310940.
  date published: 2026-07-30T18:23:33Z
audio: Wachet auf! Ruft uns die Stimme, BWV 140 (Arr. Kempff for Piano)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 133.31
  additional property: Musical Key
    type: PropertyValue
    value: 3
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.448
  additional property: Energy
    type: PropertyValue
    value: 0.063
  additional property: Speechiness
    type: PropertyValue
    value: 0.046
  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.892
  additional property: Liveness
    type: PropertyValue
    value: 0.087
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.37
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.598
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Harpsichord Suite No. 5 in E Major, HWV 430 "The Harmonious Blacksmith": IV. Air con variazioni
type: MusicRecording
duration: PT5M27S
duration ms: 327506
explicit: false
by artist: George Frideric Handel
by artist: Wilhelm Kempff
in album: Kempff plays Bach
  type: MusicAlbum
  date published: 2018-08-17
genre: classical
genre: opera
genre: early-music
genre: baroque
genre: english-baroque
genre: german-baroque
genre: choral
isrc code: GBBBA5550241
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T15:03:43+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x5f7e425e8d8ffb15715a2232e880cffe3246178c7021435d8ddd2d246bb297ce
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/GBBBA5550241
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 0x5f7e425e8d8ffb15715a2232e880cffe3246178c7021435d8ddd2d246bb297ce. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5550241.
  date published: 2026-07-08T03:20:19Z
audio: Harpsichord Suite No. 5 in E Major, HWV 430 "The Harmonious Blacksmith": IV. Air con variazioni
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 141.405
  additional property: Musical Key
    type: PropertyValue
    value: 4
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.375
  additional property: Energy
    type: PropertyValue
    value: 0.078
  additional property: Speechiness
    type: PropertyValue
    value: 0.036
  additional property: Acousticness
    type: PropertyValue
    value: 0.996
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.933
  additional property: Liveness
    type: PropertyValue
    value: 0.1
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.334
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.575
  additional property: Key Name
    type: PropertyValue
    value: E
  additional property: Mode Name
    type: PropertyValue
    value: Major

Harpsichord Suite No. 1 in B-Flat Major (Set II), HWV 434: Minuet (Arr. Kempff for Piano)
type: MusicRecording
duration: PT3M25S
duration ms: 205373
explicit: false
by artist: George Frideric Handel
by artist: Wilhelm Kempff
in album: Kempff plays Bach
  type: MusicAlbum
  date published: 2018-08-17
genre: classical
genre: opera
genre: early-music
genre: baroque
genre: english-baroque
genre: german-baroque
genre: choral
isrc code: GBBBA5550242
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-23T01:34:05+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x1f64234fa009fa67fe778c9f48a2ca5dc644b31a431cd467ea4a9e718241ef00
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5550242
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f64234fa009fa67fe778c9f48a2ca5dc644b31a431cd467ea4a9e718241ef00. 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/GBBBA5550242.
  date published: 2026-07-02T03:55:08Z
audio: Harpsichord Suite No. 1 in B-Flat Major (Set II), HWV 434: Minuet (Arr. Kempff for Piano)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 142.784
  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: 0.503
  additional property: Energy
    type: PropertyValue
    value: 0.015
  additional property: Speechiness
    type: PropertyValue
    value: 0.04
  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.944
  additional property: Liveness
    type: PropertyValue
    value: 0.131
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.12
  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.574
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Troisième livre de pièces de clavecin / Ordre XIV in D Major: 7. Le carillon de Cithére
type: MusicRecording
duration: PT4M53S
duration ms: 293720
explicit: false
by artist: François Couperin
by artist: Wilhelm Kempff
in album: Kempff plays Bach
  type: MusicAlbum
  date published: 2018-08-17
genre: classical
genre: classical-era
genre: early-music
genre: baroque
genre: french-baroque
isrc code: GBBBA5550252
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T17:27:36+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xeefa8ce1197386adc3edaa34435c1b6d0ceced4b2c07ae9b7bbfca318f4bee93
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/GBBBA5550252
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 0xeefa8ce1197386adc3edaa34435c1b6d0ceced4b2c07ae9b7bbfca318f4bee93. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5550252.
  date published: 2026-07-08T03:20:19Z
audio: Troisième livre de pièces de clavecin / Ordre XIV in D Major: 7. Le carillon de Cithére
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 125.333
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
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Suite in E Minor, RCT 2: 5. Le rappel des oiseaux (Arr. Kempff for Piano)
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by artist: Wilhelm Kempff
in album: Kempff plays Bach
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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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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Bagatelle in C Minor, WoO 52
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by artist: Ludwig van Beethoven
by artist: Wilhelm Kempff
in album: Kempff plays Bach
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  date published: 2018-08-17
genre: classical
genre: classical-piano
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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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02ced8ca93f13e798058d97b160791ae247d4c5b67d3d22a4501c9ba7136466. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA5550243.
  date published: 2026-07-08T03:20:19Z
audio: Bagatelle in C Minor, WoO 52
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Bagatelle No. 25 in A Minor, WoO 59 "Für Elise"
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duration: PT3M31S
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by artist: Wilhelm Kempff
in album: Kempff plays Bach
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  date published: 2018-08-17
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: GBBBA5550244
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: 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: 2026-07-31T12:24:41Z
audio: Bagatelle No. 25 in A Minor, WoO 59 "Für Elise"
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Beethoven Piano Sonatas: The Complete Wartime 78-rpm Recordings
type: MusicAlbum
date published: 2017-11-17
track: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": I. Grave - Allegro di molto e con brio
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  by artist: Wilhelm Kempff
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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
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a818fd961dde8802940a1bc50dcc52b4fd41fd019431f3ebfe44b241a49e3e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBSAM1740329.
    date published: 2026-07-08T03:20:19Z
  audio: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": I. Grave - Allegro di molto e con brio
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track: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": I. Allegro con brio
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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
    encoding format: application/vnd.opentimestamps.ots
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    date published: 2026-07-08T03:39:04Z
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