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genre: classical piano
description: Walter Klien (27 November 1928 – 9 February 1991) was an Austrian pianist. thumb|right|Walter Klien on concert tour 1977. Dedicated to Southern Africa tour organiser Hans Adler Career Klien was born
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album: Dvorák: Slavonic Dances, Violin Concerto in A Minor & Romance in F Minor
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album: Bizet: Jeux d'enfants (Menuetto Kids - Klassik für Kinder)
album: Ravel: Ma mère l'oye (Menuetto Kids - Klassik für Kinder)
album: Haydn: Keyboard Sonatas, Vol. 6
album: Haydn: Keyboard Sonatas, Vol. 5
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album: Wolfgang Amadeus Mozart: Two Sonatas for Piano
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Violin Sonata in A Major, D. 574: III. Andantino - Remastered 2023
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Violin Sonata in A Major, D. 574: IV. Allegro vivace - Remastered 2023
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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 0x05704ca5b450cc17642260bf4db7b3ccaed7ccad478c21c9e315c26b65d5071c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEF056503131.
  date published: 2026-07-31T15:20:15Z
audio: Fantasia in C Major, D. 934: I. Andante molto - Remastered 2023
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Fantasia in C Major, D. 934: II. Allegretto - Remastered 2023
type: MusicRecording
duration: PT4M44S
duration ms: 284546
explicit: false
by artist: Franz Schubert
by artist: Wolfgang Schneiderhan
by artist: Walter Klien
in album: Schubert: Violin Sonata in A Major, D. 574; Fantasia in C Major, D. 934; Rondo in B Minor, D. 895 / R. Strauss: Violin Sonata in E-Flat Major, Op. 18, TrV 151 (Remastered 2023)
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  date published: 2023-06-16
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056503132
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/DEF056503132
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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  date published: 2026-07-31T19:53:13Z
audio: Fantasia in C Major, D. 934: II. Allegretto - Remastered 2023
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Fantasia in C Major, D. 934: III. Andantino - Remastered 2023
type: MusicRecording
duration: PT6M12S
duration ms: 372506
explicit: false
by artist: Franz Schubert
by artist: Wolfgang Schneiderhan
by artist: Walter Klien
in album: Schubert: Violin Sonata in A Major, D. 574; Fantasia in C Major, D. 934; Rondo in B Minor, D. 895 / R. Strauss: Violin Sonata in E-Flat Major, Op. 18, TrV 151 (Remastered 2023)
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  date published: 2023-06-16
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: DEF056503133
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/DEF056503133
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 0x6f7b8ba0cbce3524153ae78942368762517677baaebf4252152221780122e553. 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/DEF056503133.
  date published: 2026-07-08T03:20:19Z
audio: Fantasia in C Major, D. 934: III. Andantino - Remastered 2023
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Chopin: Piano Works
type: MusicAlbum
date published: 2016-11-04

Beethoven: Choral Works & Piano Concertos
type: MusicAlbum
date published: 2023-10-27
track: Elegischer Gesang, Op. 118
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  by artist: St. Louis Symphony Chorus
  by artist: St. Louis Symphony
  by artist: Jerzy Semkow
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    date published: 2023-10-27
  genre: classical
  genre: classical-piano
  genre: chamber-music
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  additional property: OTSBitcoinBlock
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957118
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192331529
  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 0xfff5c1881cf0d0ef30267406bd97fc247c0172070f23c617de886262447b9b1b. 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/HKI192331529.
    date published: 2026-07-08T03:20:19Z
  audio: Elegischer Gesang, Op. 118
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    additional property: Danceability
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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Mozart: Piano Concerto No. 27 in B-Flat Major, K. 595
type: MusicAlbum
date published: 2023-02-10

Mozart: Piano Concerto No. 17 in G Major, K. 453 & Piano Concerto No. 27 in B-Flat Major, K. 595
type: MusicAlbum
date published: 2023-02-10

Mozart: Piano Concerto No. 17 in G Major, K. 453
type: MusicAlbum
date published: 2023-02-10

Schumann: Ouvetüre, Op 52 - 6 Kanons, Op. 56 - Romanzen, Op. 28
type: MusicAlbum
date published: 2021-03-26

Kinderszenen
type: MusicAlbum
date published: 2020-06-06
track: Kinderszenen, Op. 15: I. Von fremden Ländern und Menschen
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  by artist: Walter Klien
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    date published: 2020-06-06
  genre: classical
  genre: classical-piano
  genre: chamber-music
  isrc code: SEWDL0778504
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960296
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0778504
  additional property: OTSTimestamp
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    value: 2026-07-30T19:11:09Z
  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 0x0ca71edf436f4ec7394eb71e97a7cba46da431911f2484eced43fd54cf8cd1a7. 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/SEWDL0778504.
    date published: 2026-07-30T19:11:09Z
  audio: Kinderszenen, Op. 15: I. Von fremden Ländern und Menschen
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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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track: Kinderszenen, Op. 15: II. Kuriose Geschichte
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  duration: PT0M57S
  duration ms: 57826
  explicit: false
  by artist: Robert Schumann
  by artist: Walter Klien
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  genre: classical
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  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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab0d4d70aa84c42a4074482361437e09fe9c19fca89280af30e83d9f8560062. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0778505.
    date published: 2026-07-30T21:35:24Z
  audio: Kinderszenen, Op. 15: II. Kuriose Geschichte
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    additional property: Danceability
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track: Kinderszenen, Op. 15: IV. Bittendes Kind
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  by artist: Robert Schumann
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  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
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  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Kinderszenen, Op. 15: IV. Bittendes Kind
track: Kinderszenen, Op. 15: V. Glückes genug

OTSHash
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OTSBitcoinBlock
type: PropertyValue
value: 957118

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

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0778507

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

OTSVerifyInstructions
type: PropertyValue
value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96210e46733429a41a8a53ecb8239272bd3ffd4a556be2d9075fc7add3dfdc34. 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/SEWDL0778507.
date published: 2026-07-08T03:20:19Z

Kinderszenen, Op. 15: IV. Bittendes Kind
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additional property: Tempo (BPM)
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Dvorák: Slavonic Dances, Violin Concerto in A Minor & Romance in F Minor
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Vivaldi, Bach, Mozart, Paradis & Brahms: Violin Works (Live)
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Blue Edition - Schumann: 3 Romances & Kinderszenen
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Bizet: Jeux d'enfants (Menuetto Kids - Klassik für Kinder)
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Ravel: Ma mère l'oye (Menuetto Kids - Klassik für Kinder)
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Haydn: Keyboard Sonatas, Vol. 6
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Haydn: Keyboard Sonatas, Vol. 5
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Masterpieces for Piano Left Hand [Brahms, Martinů, Janáček, Strauss]
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Dvořák: Danze slave
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Mozart: The Piano Sonatas
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Wolfgang Amadeus Mozart: Two Sonatas for Piano
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The Works of Claude Debussy
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50 Debussy
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Brahms, Vol. 11 : Piano Four Hands
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WALTER KLIEN PLAYS BRAHMS
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BRAHMS: Variations on a Theme of Schumann, op.9/ 1. Theme
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Schubert: Piano Sonatas No. 16, 19 & 21 - Arpeggione Sonata
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Smetana - Piano Works
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Brendel - Mozart - Concerto For Two Pianos And Orchestra - Sonata For Two Pianos
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Brahms - Fantasias - Intermezzi - Piano Pieces
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Beethoven - Piano Sonatas - Moonlight - Pathetique - Appassionata
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track: Violin Sonata in B-Flat Major, K. 454: II. Andante
track: Violin Sonata in B-Flat Major, K. 378: III. Rondeau. Allegro
track: Violin Sonata in B-Flat Major, K. 454: III. Allegretto
track: Violin Sonata in G Major, K. 379: Ia. Adagio
track: Violin Sonata in E-Flat Major, K. 481: I. Molto allegro
track: Violin Sonata in G Major, K. 379: Ib. Allegro
track: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Theme. Andantino cantabile
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track: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 2
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track: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 3
track: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 4
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track: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 5
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track: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Theme. Allegretto – Coda
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track: Violin Sonata in E-Flat Major, K. 380: I. Allegro
track: Violin Sonata in E-Flat Major, K. 380: II. Andante con moto
track: Violin Sonata in A Major, K. 526: II. Andante
track: Violin Sonata in E-Flat Major, K. 380: III. Rondeau. Allegro

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Violin Sonata in B-Flat Major, K. 454: II. Andante
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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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Violin Sonata in E-Flat Major, K. 481: I. Molto allegro
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T16:09:41Z
audio: Violin Sonata in E-Flat Major, K. 481: I. Molto allegro
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Violin Sonata in G Major, K. 379: Ib. Allegro
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duration: PT4M12S
duration ms: 252493
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021030
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021030
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T15:27:29Z
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 0x93b009b5f0a8bcfb07043dcc208707fe1b99858a90f477f80a79d01c5e4d8ea6. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/NLA508021030.
  date published: 2026-07-31T15:27:29Z
audio: Violin Sonata in G Major, K. 379: Ib. Allegro
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Violin Sonata in G Major, K. 379: II. Tema con variazioni: Theme. Andantino cantabile
type: MusicRecording
duration: PT1M8S
duration ms: 68666
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021031
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/NLA508021031
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-07T08:25:35Z
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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c508c5a355e6308ac030849a4656d808fb09c21a615d1c39a732e7412f0aaa6. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/NLA508021031.
  date published: 2026-07-07T08:25:35Z
audio: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Theme. Andantino cantabile
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Theme
type: MusicRecording
duration: PT1M4S
duration ms: 64066
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021056
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/NLA508021056
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
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  date published: 2026-07-31T04:14:58Z
audio: Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Theme
  type: AudioObject
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  additional property: Valence (Positivity)
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Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 1 (Violino tacet)
type: MusicRecording
duration: PT1M18S
duration ms: 78666
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021032
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
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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
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021032
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T02:21:55Z
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 0x9646beb0abc2462bce9c77a55395f5e87d8c025b22fcd71e99f53f9ce155210b. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/NLA508021032.
  date published: 2026-07-30T02:21:55Z
audio: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 1 (Violino tacet)
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  additional property: Mode (Major/Minor)
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  additional property: Danceability
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  additional property: Energy
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 1
type: MusicRecording
duration: PT1M1S
duration ms: 61626
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021057
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
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additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xc146390298a2e364eac4dc588d268123e2c02ef15049de4c32996118bb52143d
additional property: OTSHash
additional property: OTSBitcoinBlock
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  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/NLA508021057
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 0xc146390298a2e364eac4dc588d268123e2c02ef15049de4c32996118bb52143d. 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/NLA508021057.
  date published: 2026-07-08T03:20:19Z
audio: Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 1
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Danceability
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  additional property: Energy
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  additional property: 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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  additional property: Key Name
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  additional property: Mode Name
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Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 2
type: MusicRecording
duration: PT1M11S
duration ms: 71600
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021033
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
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additional property: CopyrightChainExplorerURL
  type: PropertyValue
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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/NLA508021033
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 0xc40cc3c272dd34ba471befd4588f0d9b325197a8fa6bf843b2d40d8b4ebb736b. 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/NLA508021033.
  date published: 2026-07-08T03:20:19Z
audio: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 2
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  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: 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: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 2
type: MusicRecording
duration: PT1M2S
duration ms: 62773
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021058
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T05:55:04+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8f2ba6937dcd91ef6bd4e0f632e4d5ff2da1d6333fd23aa3428262ae3b283c2d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960360
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960360
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021058
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T06:42:11Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2ba6937dcd91ef6bd4e0f632e4d5ff2da1d6333fd23aa3428262ae3b283c2d. 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/NLA508021058.
  date published: 2026-07-31T06:42:11Z
audio: Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 2
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 158.802
  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: 0.283
  additional property: Energy
    type: PropertyValue
    value: 0.215
  additional property: Speechiness
    type: PropertyValue
    value: 0.045
  additional property: Acousticness
    type: PropertyValue
    value: 0.991
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.943
  additional property: Liveness
    type: PropertyValue
    value: 0.368
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.619
  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.891
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 3
type: MusicRecording
duration: PT1M10S
duration ms: 70706
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021034
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x922403682a20b8abb3e64370477b6317d7717dc9fcdbd59130dd24e0589ff93e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960247
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960247
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021034
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T10:42:33Z
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 0x922403682a20b8abb3e64370477b6317d7717dc9fcdbd59130dd24e0589ff93e. 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/NLA508021034.
  date published: 2026-07-30T10:42:33Z
audio: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 3
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 131.552
  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: 0.419
  additional property: Energy
    type: PropertyValue
    value: 0.095
  additional property: Speechiness
    type: PropertyValue
    value: 0.046
  additional property: Acousticness
    type: PropertyValue
    value: 0.991
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.05
  additional property: Liveness
    type: PropertyValue
    value: 0.393
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.652
  additional property: Loudness (dB)
    type: PropertyValue
    value: -22.321
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 4
type: MusicRecording
duration: PT1M18S
duration ms: 78360
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021035
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xebf5db3d81281a60e4ece81a6da72bdff6f6860bfa0a9fce48616a165106a897
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960231
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960231
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021035
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T08:33:28Z
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 0xebf5db3d81281a60e4ece81a6da72bdff6f6860bfa0a9fce48616a165106a897. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/NLA508021035.
  date published: 2026-07-30T08:33:28Z
audio: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 4
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 153.799
  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: 0.259
  additional property: Energy
    type: PropertyValue
    value: 0.101
  additional property: Speechiness
    type: PropertyValue
    value: 0.04
  additional property: Acousticness
    type: PropertyValue
    value: 0.982
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.124
  additional property: Liveness
    type: PropertyValue
    value: 0.125
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.394
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.954
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 4
type: MusicRecording
duration: PT1M12S
duration ms: 72026
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021060
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x44827d1e663f4e67a98d6ecb04576ec83eaf1bc1d884baa3326b3eeb5407340b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960485
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960485
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021060
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-08-01T00:10:46Z
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 0x44827d1e663f4e67a98d6ecb04576ec83eaf1bc1d884baa3326b3eeb5407340b. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/NLA508021060.
  date published: 2026-08-01T00:10:46Z
audio: Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 4
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 151.687
  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: 0.534
  additional property: Energy
    type: PropertyValue
    value: 0.046
  additional property: Speechiness
    type: PropertyValue
    value: 0.118
  additional property: Acousticness
    type: PropertyValue
    value: 0.982
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.248
  additional property: Liveness
    type: PropertyValue
    value: 0.163
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.548
  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.604
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 5
type: MusicRecording
duration: PT2M32S
duration ms: 152000
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021036
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x5e8a045a595a82fa9c7afbc4094252db00f9ba641ba449a05010f2e527837eaa
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960200
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960200
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021036
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T02:37:10Z
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 0x5e8a045a595a82fa9c7afbc4094252db00f9ba641ba449a05010f2e527837eaa. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021036.
  date published: 2026-07-30T02:37:10Z
audio: Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 5
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 124.397
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.424
  additional property: Energy
    type: PropertyValue
    value: 0.057
  additional property: Speechiness
    type: PropertyValue
    value: 0.047
  additional property: Acousticness
    type: PropertyValue
    value: 0.994
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.958
  additional property: Liveness
    type: PropertyValue
    value: 0.124
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.298
  additional property: Loudness (dB)
    type: PropertyValue
    value: -29.743
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major

Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 5
type: MusicRecording
duration: PT1M15S
duration ms: 75906
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021061
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb815d29990cdc6ef70c1b2241afb397e863b423881623b92532ac14097478c53
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960481
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960481
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021061
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T23:51:35Z
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 0xb815d29990cdc6ef70c1b2241afb397e863b423881623b92532ac14097478c53. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/NLA508021061.
  date published: 2026-07-31T23:51:35Z
audio: Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 5
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 161.901
  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: 0.345
  additional property: Energy
    type: PropertyValue
    value: 0.147
  additional property: Speechiness
    type: PropertyValue
    value: 0.039
  additional property: Acousticness
    type: PropertyValue
    value: 0.99
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.823
  additional property: Liveness
    type: PropertyValue
    value: 0.142
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.873
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.062
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major

Violin Sonata in G Major, K. 379: II. Tema con variazioni: Theme. Allegretto – Coda
type: MusicRecording
duration: PT1M33S
duration ms: 93000
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Grumiaux
by artist: Walter Klien
in album: Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
  type: MusicAlbum
  date published: 2005-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: NLA508021037
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T07:15:42+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x1c39d3b6bcf8d8040536567bd7414a5fdb81d05b3f38f8d5e1392ee0b9785d28
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957819
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957819
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021037
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-13T07:53:33Z
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
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 6
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by artist: Arthur Grumiaux
by artist: Walter Klien
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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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Violin Sonata in E-Flat Major, K. 380: I. Allegro
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by artist: Arthur Grumiaux
by artist: Walter Klien
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subject of: OpenTimestamps Proof of Existence
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Violin Sonata in E-Flat Major, K. 380: II. Andante con moto
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by artist: Walter Klien
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
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Violin Sonata in A Major, K. 526: II. Andante
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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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Violin Sonata in E-Flat Major, K. 380: III. Rondeau. Allegro
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Violin Sonata in E-Flat Major, K. 380: III. Rondeau. Allegro
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Walter Klein Plays Brahms
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date published: 2004-01-01

W.A. Mozart: Die späten Violinsonaten
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-31T23:51:35Z
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Brahms: Piano Music, Vol. 3
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Brahms: Piano Music, Vol. 2
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Brahms: Piano Music, Vol. 1
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Mozart: Piano Concertos Nos. 18 & 21
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Piano Concerto No. 23 in A Major, K. 488: II. Adagio
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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
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  date published: 2026-07-31T05:23:41Z
audio: Fantasy in D Minor, K.397
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Piano Sonata No. 11 in A Major, K. 331, III. Alla Turca - Allegretto
type: MusicRecording
duration: PT3M7S
duration ms: 187057
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Walter Klien
in album: Uplifting Classical - Music to energize your mood
  type: MusicAlbum
  date published: 2017-04-04
popularity: 3
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: USZDG0601004
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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 0x9ba561ab48c5e0712fd1b5f0eaf1729413ffad08fc97191f16563ce6a0603bc3. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/USZDG0601004.
  date published: 2026-07-30T16:10:47Z
audio: Piano Sonata No. 11 in A Major, K. 331, III. Alla Turca - Allegretto
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