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genre: classical piano
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  track: Sei piccoli pezzi: III. Canzone armena. Andantino
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  track: Jeux d'enfants, GB 142/Op. 22: III. La Poupée. Berceuse
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album: Mozart: Works for Two Pianists/Werke für zwei Pianisten, Vol. 1
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album: Schubert: Piano Music for 4 Hands, Vol. 5
album: Schubert: Klaviermusik zu 4 Händen Vol. 6
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16 Waltzes, Op. 39 (Version for Piano Duet): No. 15 in A-Flat Major
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Pupazzetti, Op. 27: II. Berceuse. Andantino dolcissimo
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Koechlin - Piano Music For Four Hands
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track: Sonatine francaise, Op. 60: No. 4: I. Romance
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Mozart & Czerny: Concertos for Two Pianists and Orchestra
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Vaughan Williams: Concerto for Two Pianos & Orchestra/Symphony No. 5
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Wagner: Piano Transcriptions for Four Hands
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J.S. Bach: Transkriptionen
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-07T18:50:38Z
  audio: Brandenburg Concerto No. 6, BWV 1051 (Arr. for Two Pianos by Gustav Clemens Felix Krug): III. Allegro
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  subject of: OpenTimestamps Proof of Existence
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track: Sonata in D Minor, BWV 964: III. Andante (Arr. for Two Pianos by Cyril Scott)
track: Schlummert ein, ihr matten Augen, BWV 82, No. 3 (Arr. for Two Pianos by Ludwig Lebell)
track: Toccata in C Major, BWV 564: II. Adagio (Arr. for Two Pianos by Alexander Kelberine)
track: Passacaglia in C Minor, BWV 582 (Arr. for Two Pianos by Gino Tagliapietra)

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OTSVerificationAPI
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OTSTimestamp
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OTSVerifyInstructions
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OpenTimestamps Proof of Existence
type: DigitalDocument
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description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353b7003614c35a1a1c1549ee42b7aa34f4d3dfb9097b957e39604e29fc2eef9. 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/DEE862400947.
date published: 2026-07-08T03:20:19Z

Es ist vollbracht, BWV 159, No. 4 (Arr. for Two Pianos by Roy Douglas)
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Sonata in D Minor, BWV 964: III. Andante (Arr. for Two Pianos by Cyril Scott)
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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: Sonata in D Minor, BWV 964: III. Andante (Arr. for Two Pianos by Cyril Scott)
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Schlummert ein, ihr matten Augen, BWV 82, No. 3 (Arr. for Two Pianos by Ludwig Lebell)
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-07T13:52:39Z
audio: Schlummert ein, ihr matten Augen, BWV 82, No. 3 (Arr. for Two Pianos by Ludwig Lebell)
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Toccata in C Major, BWV 564: II. Adagio (Arr. for Two Pianos by Alexander Kelberine)
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by artist: Tal & Groethuysen
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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: Toccata in C Major, BWV 564: II. Adagio (Arr. for Two Pianos by Alexander Kelberine)
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Passacaglia in C Minor, BWV 582 (Arr. for Two Pianos by Gino Tagliapietra)
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by artist: Tal & Groethuysen
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Passacaglia in C Minor, BWV 582 (Arr. for Two Pianos by Gino Tagliapietra)
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Avec Esprit: Gouvy, Mélan-Guéroult, Saint-Saens, Ysaye
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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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x030c27781d75005be8c643bcd27a13886c107049dc9a06bb6f33c367547c9f64. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEE862202516.
    date published: 2026-07-08T03:53:27Z
  audio: Lilli Bulléro (Variations pour deux pianos sur un air anglais), Op.62
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J.S. Bach & Reinhard Febel: 18 Studies on 'The Art of Fugue'
type: MusicAlbum
date published: 2020-08-14

Colors - Works by Debussy & Strauss
type: MusicAlbum
date published: 2017-08-04
track: Prélude à l'après-midi d'un faune, L. 86 (Arr. for 2 Pianos)
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  by artist: Tal & Groethuysen
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  genre: classical
  genre: impressionism
  genre: post-romantic-era
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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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1e9983274753cdbe8d082a01f8b49b7759f4105255e21d2bf80335fa876e02. 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/DEE861701174.
    date published: 2026-07-08T03:20:19Z
  audio: Prélude à l'après-midi d'un faune, L. 86 (Arr. for 2 Pianos)
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1915 - Works by Debussy & Hahn
type: MusicAlbum
date published: 2015-08-14
track: Le ruban dénoué, 12 Waltzes for Two Pianos: I. Decrets indolents du hasard
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  duration: PT1M23S
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  by artist: Tal & Groethuysen
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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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
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    date published: 2026-07-02T03:55:08Z
  audio: Le ruban dénoué, 12 Waltzes for Two Pianos: I. Decrets indolents du hasard
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track: Pour bercer un convalescent for Two Pianos: III. Andantino espressivo
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  by artist: Tal & Groethuysen
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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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
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    date published: 2026-07-02T05:09:12Z
  audio: Pour bercer un convalescent for Two Pianos: III. Andantino espressivo
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    additional property: Valence (Positivity)
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Rossini: Petite Messe Solennelle
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date published: 2014-04-14
track: Petite Messe solennelle: I. Kyrie eleison - Christe eleison
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  duration: PT6M52S
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  by artist: Bavarian Radio Chorus
  by artist: Tal & Groethuysen
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    date published: 2014-04-14
  genre: classical
  genre: opera
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    type: PropertyValue
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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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
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    date published: 2026-07-06T06:56:49Z
  audio: Petite Messe solennelle: I. Kyrie eleison - Christe eleison
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    additional property: Acousticness
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track: Petite Messe solennelle: VI. Quoniam tu solus sanctus
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  by artist: Michael Volle
  by artist: Tal & Groethuysen
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    type: MusicAlbum
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  genre: classical
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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
  subject of: OpenTimestamps Proof of Existence
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    encoding format: application/vnd.opentimestamps.ots
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    date published: 2026-07-08T08:56:20Z
  audio: Petite Messe solennelle: VI. Quoniam tu solus sanctus
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track: Petite Messe solennelle: VIII. Credo in unum Deo
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  by artist: Eric Cutler
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  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Petite Messe solennelle: VIII. Credo in unum Deo
track: Petite Messe solennelle: IX. Crucifixus
track: Petite Messe solennelle: XI. Et vitam venturi saeculi
track: Petite Messe solennelle: XII. Prélude religieux (pendant l'Offertoire)
track: Petite Messe solennelle: XIII. Ritournelle pour le Sanctus
track: Petite Messe solennelle: XIV. Sanctus
track: Petite Messe solennelle: XVI. Agnus Dei

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OTSBitcoinBlock
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OTSBitcoinBlockVerifyURL
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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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd55fa9bd5b6c11788ec5f57805cad8ec64849e778c8abdb75734a0cd4d71055. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE861400068.
date published: 2026-07-08T08:56:20Z

Petite Messe solennelle: VIII. Credo in unum Deo
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Petite Messe solennelle: IX. Crucifixus
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by artist: Regula Mühlemann
by artist: Tal & Groethuysen
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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
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
audio: Petite Messe solennelle: IX. Crucifixus
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Petite Messe solennelle: XI. Et vitam venturi saeculi
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by artist: Bavarian Radio Chorus
by artist: Tal & Groethuysen
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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: 2026-07-08T03:53:27Z
audio: Petite Messe solennelle: XI. Et vitam venturi saeculi
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Petite Messe solennelle: XII. Prélude religieux (pendant l'Offertoire)
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by artist: Tal & Groethuysen
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Petite Messe solennelle: XII. Prélude religieux (pendant l'Offertoire)
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Petite Messe solennelle: XIII. Ritournelle pour le Sanctus
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by artist: Max Hanft
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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: 2026-07-08T03:53:27Z
audio: Petite Messe solennelle: XIII. Ritournelle pour le Sanctus
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Petite Messe solennelle: XIV. Sanctus
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by artist: Anke Vondung
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by artist: Bavarian Radio Chorus
by artist: Tal & Groethuysen
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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: 2026-07-08T08:56:20Z
audio: Petite Messe solennelle: XIV. Sanctus
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Petite Messe solennelle: XVI. Agnus Dei
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by artist: Anke Vondung
by artist: Bavarian Radio Chorus
by artist: Tal & Groethuysen
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genre: classical
genre: opera
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
audio: Petite Messe solennelle: XVI. Agnus Dei
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Götterdämmerung
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Dvorák: Slavonic Dances
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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: 2026-07-06T07:16:32Z
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  subject of: OpenTimestamps Proof of Existence
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  subject of: OpenTimestamps Proof of Existence
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OpenTimestamps Proof of Existence
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encoding format: application/vnd.opentimestamps.ots
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date published: 2026-07-02T05:09:12Z

Ländler (adapted for Piano Four Hands): XII.
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-02T11:38:34Z
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    date published: 2026-07-02T03:55:08Z
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track: Goldberg Variations - Version for 2 Pianos by Rheinberger/Reger: 30. Quodlibet

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OTSVerifyInstructions
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OpenTimestamps Proof of Existence
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date published: 2026-07-02T03:55:08Z

Goldberg Variations - Version for 2 Pianos by Rheinberger/Reger: 19. Allegretto
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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/DEE860900570
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b121aff91cc292a4e49e1085a353e5539e558de78f63becc2bece3d995468a. 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/DEE860900570.
  date published: 2026-07-02T03:55:08Z
audio: Goldberg Variations - Version for 2 Pianos by Rheinberger/Reger: 30. Quodlibet
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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: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Mendelssohn-Bartholdy: Piano Works for 4 Hands
type: MusicAlbum
date published: 2009-02-16

Brahms, Febel, Reger: Choralpreludes
type: MusicAlbum
date published: 2008-03-21
track: Choral Preludes for Organ, Op. posth. 122: No.10 Herzlich thut mich verlangen - Version b
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  duration ms: 175866
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  by artist: Johannes Brahms
  by artist: Tal & Groethuysen
  in album: Brahms, Febel, Reger: Choralpreludes
    type: MusicAlbum
    date published: 2008-03-21
  genre: classical
  genre: german-romanticism
  genre: late-romantic-era
  isrc code: DEE860701017
  additional property: CopyrightID
  additional property: CopyrightStatus
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  additional property: CopyrightRegisteredAt
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    value: https://explorer.copyrightchains.com/tx/0xc712ce9f5ca705e33f1098a33757eef466a25cf2339ce91ec1b9598796424fd5
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  additional property: OTSBitcoinBlock
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    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/DEE860701017
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc712ce9f5ca705e33f1098a33757eef466a25cf2339ce91ec1b9598796424fd5. 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/DEE860701017.
    date published: 2026-07-08T03:22:41Z
  audio: Choral Preludes for Organ, Op. posth. 122: No.10 Herzlich thut mich verlangen - Version b
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    additional property: Tempo (BPM)
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    additional property: Musical Key
      type: PropertyValue
      value: 9
    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
      type: PropertyValue
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    additional property: Speechiness
      type: PropertyValue
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    additional property: Acousticness
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      value: 0.994
    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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Mozart: Works for Two Pianists/Werke für zwei Pianisten, Vol. 3
type: MusicAlbum
date published: 2006-06-14

Mozart: Werke für 2 Pianisten Vol. 2
type: MusicAlbum
date published: 2005-11-07
track: Sonata for 2 Pianos in D Major, K. 448/375a: I. Allegro
  type: MusicRecording
  duration: PT8M0S
  duration ms: 480586
  explicit: false
  by artist: Wolfgang Amadeus Mozart
  by artist: Tal & Groethuysen
  in album: Mozart: Werke für 2 Pianisten Vol. 2
    type: MusicAlbum
    date published: 2005-11-07
  genre: classical
  genre: classical-era
  isrc code: DEE860500717
  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: 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/DEE860500717
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e6050e6750027068601925d20c7c6fe3740f35ef1d674c7f04a605720072b0. 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/DEE860500717.
    date published: 2026-07-08T03:22:41Z
  audio: Sonata for 2 Pianos in D Major, K. 448/375a: I. Allegro
    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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      value: 1
    additional property: Time Signature
      type: PropertyValue
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
      type: PropertyValue
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    additional property: Speechiness
      type: PropertyValue
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    additional property: Acousticness
      type: PropertyValue
      value: 0.993
    additional property: Instrumentalness
      type: PropertyValue
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    additional property: Liveness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
      type: PropertyValue
      value: -26.843
    additional property: Key Name
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      value: A
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Sonata for 2 Pianos in D Major, K. 448/375a: II. Andante
  type: MusicRecording
  duration: PT7M41S
  duration ms: 461386
  explicit: false
  by artist: Wolfgang Amadeus Mozart
  by artist: Tal & Groethuysen
  in album: Mozart: Werke für 2 Pianisten Vol. 2
    type: MusicAlbum
    date published: 2005-11-07
  genre: classical
  genre: classical-era
  isrc code: DEE860500718
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
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  additional property: CopyrightChainExplorerURL
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  additional property: OTSBitcoinBlock
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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/DEE860500718
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba61dff0d8447c4abf005d7ca526b38840a177cbaee9d64768b568ed248a1f0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEE860500718.
    date published: 2026-07-08T03:53:27Z
  audio: Sonata for 2 Pianos in D Major, K. 448/375a: II. Andante
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
      type: PropertyValue
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
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    additional property: Speechiness
      type: PropertyValue
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    additional property: Acousticness
      type: PropertyValue
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    additional property: Instrumentalness
      type: PropertyValue
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    additional property: Liveness
      type: PropertyValue
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
      type: PropertyValue
      value: -37.064
    additional property: Key Name
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    additional property: Mode Name
      type: PropertyValue
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track: Sonata for 2 Pianos in D Major, K. 448/375a: III. Molto allegro
  type: MusicRecording
  duration: PT6M10S
  duration ms: 370466
  explicit: false
  by artist: Wolfgang Amadeus Mozart
  by artist: Tal & Groethuysen
  in album: Mozart: Werke für 2 Pianisten Vol. 2
    type: MusicAlbum
    date published: 2005-11-07
  genre: classical
  genre: classical-era
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  additional property: CopyrightStatus
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  additional property: OTSBitcoinBlock
  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
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  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Sonata for 2 Pianos in D Major, K. 448/375a: III. Molto allegro
track: Sonata for Piano Four-Hands in C Major, K. 19d: II. Menuetto - Trio
track: Larghetto & Allegro for 2 Pianos in E-Flat Major, K. deest: I. Larghetto

OTSHash
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OTSBitcoinBlock
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value: 957122

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/957122

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE860500719

OTSTimestamp
type: PropertyValue
value: 2026-07-08T03:39:04Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a8aa56a7987ca078413f6fd8069442807502bdb3f494656519f0c2b0358428. 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/DEE860500719.
date published: 2026-07-08T03:39:04Z

Sonata for 2 Pianos in D Major, K. 448/375a: III. Molto allegro
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additional property: Tempo (BPM)
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additional property: Musical Key
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additional property: Mode (Major/Minor)
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additional property: Time Signature
  type: PropertyValue
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additional property: Danceability
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additional property: Energy
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additional property: Speechiness
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additional property: Acousticness
  type: PropertyValue
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additional property: Instrumentalness
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additional property: Liveness
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additional property: Valence (Positivity)
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additional property: Loudness (dB)
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additional property: Key Name
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additional property: Mode Name
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Sonata for Piano Four-Hands in C Major, K. 19d: II. Menuetto - Trio
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duration: PT3M41S
duration ms: 221040
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Tal & Groethuysen
in album: Mozart: Werke für 2 Pianisten Vol. 2
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  date published: 2005-11-07
genre: classical
genre: classical-era
isrc code: DEE860500725
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
  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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeaa53aeda6fce68e273c9207de04186a26a5705a29456a49cde0036c08d8573. 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/DEE860500725.
  date published: 2026-07-02T03:55:08Z
audio: Sonata for Piano Four-Hands in C Major, K. 19d: II. Menuetto - Trio
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
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  additional property: 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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Larghetto & Allegro for 2 Pianos in E-Flat Major, K. deest: I. Larghetto
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by artist: Wolfgang Amadeus Mozart
by artist: Tal & Groethuysen
in album: Mozart: Werke für 2 Pianisten Vol. 2
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genre: classical
genre: classical-era
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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
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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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39d59152d6f7c879862d44e27c55ce71b7daa0b95aebc7d3f2fc97a32fe382a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEE860500728.
  date published: 2026-07-06T01:25:57Z
audio: Larghetto & Allegro for 2 Pianos in E-Flat Major, K. deest: I. Larghetto
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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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Schubert: Piano Music for Four Hands, Vol. IV
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Schubert: Piano Music for 4 Hands, Vol. 5
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Schubert: Klaviermusik zu 4 Händen Vol. 6
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Schubert: Piano Music for 4 Hands, Vol. 3
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Schubert: Piano Music for 4 Hands, Vol. 1
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Schubert: Klaviermusik zu 4 Händen Vol. 4
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Schubert: Klaviermusik zu 4 Händen Vol. 2
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OpenTimestamps Proof of Existence
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  type: PropertyValue
  value: 2026-07-07T17:28:15+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x1cc7fbf0de21f498a3138fe687e3cba7d7cdd2d0b6dedcf25a34eac329369614
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/USSM19200634
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc7fbf0de21f498a3138fe687e3cba7d7cdd2d0b6dedcf25a34eac329369614. 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/USSM19200634.
  date published: 2026-07-08T03:20:19Z
audio: 21 Hungarian Dances, WoO 1: No. 12 in D Minor. Presto
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 110.692
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.373
  additional property: Energy
    type: PropertyValue
    value: 0.067
  additional property: Speechiness
    type: PropertyValue
    value: 0.034
  additional property: Acousticness
    type: PropertyValue
    value: 0.992
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.935
  additional property: Liveness
    type: PropertyValue
    value: 0.09
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.323
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.233
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Minor

21 Hungarian Dances, WoO 1: No. 15 in B-Flat Major. Allegretto grazioso
type: MusicRecording
duration: PT2M23S
duration ms: 143866
explicit: false
by artist: Johannes Brahms
by artist: Tal & Groethuysen
in album: Brahms: 21 Hungarian Dances, WoO 1 & 16 Waltzes, Op. 39
  type: MusicAlbum
  date published: 1993-11-15
genre: classical
genre: german-romanticism
genre: late-romantic-era
isrc code: USSM19200637
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T20:19:09+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x68e560bc0d7a4a4bf70632c29302e78a4190275263e5ca2d7288b21cc869db67
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957124
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957124
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM19200637
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:53:27Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e560bc0d7a4a4bf70632c29302e78a4190275263e5ca2d7288b21cc869db67. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USSM19200637.
  date published: 2026-07-08T03:53:27Z
audio: 21 Hungarian Dances, WoO 1: No. 15 in B-Flat Major. Allegretto grazioso
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 118.98
  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: 0.506
  additional property: Energy
    type: PropertyValue
    value: 0.117
  additional property: Speechiness
    type: PropertyValue
    value: 0.037
  additional property: Acousticness
    type: PropertyValue
    value: 0.992
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.893
  additional property: Liveness
    type: PropertyValue
    value: 0.114
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.445
  additional property: Loudness (dB)
    type: PropertyValue
    value: -23.73
  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Major

21 Hungarian Dances, WoO 1: No. 16 in F Minor. Con moto
type: MusicRecording
duration: PT2M21S
duration ms: 141306
explicit: false
by artist: Johannes Brahms
by artist: Tal & Groethuysen
in album: Brahms: 21 Hungarian Dances, WoO 1 & 16 Waltzes, Op. 39
  type: MusicAlbum
  date published: 1993-11-15
genre: classical
genre: german-romanticism
genre: late-romantic-era
isrc code: USSM19200638
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T17:46:27+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6e53d17b64ef78ed5fb4fd55ea602eabe9ae0f38fef74abfbd5b1bdaec7fb885
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957145
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957145
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM19200638
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T08:56:20Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e53d17b64ef78ed5fb4fd55ea602eabe9ae0f38fef74abfbd5b1bdaec7fb885. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM19200638.
  date published: 2026-07-08T08:56:20Z
audio: 21 Hungarian Dances, WoO 1: No. 16 in F Minor. Con moto
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 129.78
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.404
  additional property: Energy
    type: PropertyValue
    value: 0.09
  additional property: Speechiness
    type: PropertyValue
    value: 0.041
  additional property: Acousticness
    type: PropertyValue
    value: 0.994
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.884
  additional property: Liveness
    type: PropertyValue
    value: 0.113
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.131
  additional property: Loudness (dB)
    type: PropertyValue
    value: -26.406
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Major

21 Hungarian Dances, WoO 1: No. 19 in B Minor. Allegretto
type: MusicRecording
duration: PT1M48S
duration ms: 108000
explicit: false
by artist: Johannes Brahms
by artist: Tal & Groethuysen
in album: Brahms: 21 Hungarian Dances, WoO 1 & 16 Waltzes, Op. 39
  type: MusicAlbum
  date published: 1993-11-15
genre: classical
genre: german-romanticism
genre: late-romantic-era
isrc code: USSM19200641
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T15:02:23+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x01bb7b1f450f31954ca93f94490fde1dc6d2ed4f12b2a9f3342df1f9df8537fd
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957124
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957124
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM19200641
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:53:27Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bb7b1f450f31954ca93f94490fde1dc6d2ed4f12b2a9f3342df1f9df8537fd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USSM19200641.
  date published: 2026-07-08T03:53:27Z
audio: 21 Hungarian Dances, WoO 1: No. 19 in B Minor. Allegretto
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 97.097
  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: 0.485
  additional property: Energy
    type: PropertyValue
    value: 0.112
  additional property: Speechiness
    type: PropertyValue
    value: 0.048
  additional property: Acousticness
    type: PropertyValue
    value: 0.991
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.836
  additional property: Liveness
    type: PropertyValue
    value: 0.104
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.68
  additional property: Loudness (dB)
    type: PropertyValue
    value: -25.914
  additional property: Key Name
    type: PropertyValue
    value: B
  additional property: Mode Name
    type: PropertyValue
    value: Minor

16 Waltzes, Op. 39 (Version for Piano Duet): No. 2 in E Major
type: MusicRecording
duration: PT1M17S
duration ms: 77266
explicit: false
by artist: Johannes Brahms
by artist: Tal & Groethuysen
in album: Brahms: 21 Hungarian Dances, WoO 1 & 16 Waltzes, Op. 39
  type: MusicAlbum
  date published: 1993-11-15
genre: classical
genre: german-romanticism
genre: late-romantic-era
isrc code: USSM10601762
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-27T06:49:09+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf2ecff6ceb5d67821703c95e0a9170f577d47ee01e4c4ebe17405be47424c2aa
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956351
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956351
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10601762
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T11:38:34Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ecff6ceb5d67821703c95e0a9170f577d47ee01e4c4ebe17405be47424c2aa. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USSM10601762.
  date published: 2026-07-02T11:38:34Z
audio: 16 Waltzes, Op. 39 (Version for Piano Duet): No. 2 in E Major
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 97.612
  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: 0.421
  additional property: Energy
    type: PropertyValue
    value: 0.008
  additional property: Speechiness
    type: PropertyValue
    value: 0.044
  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.808
  additional property: Liveness
    type: PropertyValue
    value: 0.097
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.074
  additional property: Loudness (dB)
    type: PropertyValue
    value: -35.266
  additional property: Key Name
    type: PropertyValue
    value: B
  additional property: Mode Name
    type: PropertyValue
    value: Major

16 Waltzes, Op. 39 (Version for Piano Duet): No. 3 in G-Sharp Minor
type: MusicRecording
duration: PT0M39S
duration ms: 39373
explicit: false
by artist: Johannes Brahms
by artist: Tal & Groethuysen
in album: Brahms: 21 Hungarian Dances, WoO 1 & 16 Waltzes, Op. 39
  type: MusicAlbum
  date published: 1993-11-15
genre: classical
genre: german-romanticism
genre: late-romantic-era
isrc code: USSM19200646
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-27T06:48:27+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb11e8d70a53ce6634f30170b8e31cb2414f20c98f024b594c3665744e66aeaac
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956351
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956351
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM19200646
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T11:38:34Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11e8d70a53ce6634f30170b8e31cb2414f20c98f024b594c3665744e66aeaac. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USSM19200646.
  date published: 2026-07-02T11:38:34Z
audio: 16 Waltzes, Op. 39 (Version for Piano Duet): No. 3 in G-Sharp Minor
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 85.666
  additional property: Musical Key
    type: PropertyValue
    value: 8
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.5
  additional property: Energy
    type: PropertyValue
    value: 0.017
  additional property: Speechiness
    type: PropertyValue
    value: 0.041
  additional property: Acousticness
    type: PropertyValue
    value: 0.992
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.894
  additional property: Liveness
    type: PropertyValue
    value: 0.117
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.733
  additional property: Loudness (dB)
    type: PropertyValue
    value: -35.356
  additional property: Key Name
    type: PropertyValue
    value: Ab
  additional property: Mode Name
    type: PropertyValue
    value: Minor

16 Waltzes, Op. 39 (Version for Piano Duet): No. 7 in C-Sharp Minor. Poco più andante
type: MusicRecording
duration: PT2M1S
duration ms: 121800
explicit: false
by artist: Johannes Brahms
by artist: Tal & Groethuysen
in album: Brahms: 21 Hungarian Dances, WoO 1 & 16 Waltzes, Op. 39
  type: MusicAlbum
  date published: 1993-11-15
genre: classical
genre: german-romanticism
genre: late-romantic-era
isrc code: USSM19200650
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T19:38:03+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdd12c5d88710d4c1c3a98fb1320764a2198692fcb1a264da031a1df54bc7b7d3
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957124
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957124
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM19200650
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:53:27Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd12c5d88710d4c1c3a98fb1320764a2198692fcb1a264da031a1df54bc7b7d3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USSM19200650.
  date published: 2026-07-08T03:53:27Z
audio: 16 Waltzes, Op. 39 (Version for Piano Duet): No. 7 in C-Sharp Minor. Poco più andante
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 94.61
  additional property: Musical Key
    type: PropertyValue
    value: 1
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.405
  additional property: Energy
    type: PropertyValue
    value: 0.008
  additional property: Speechiness
    type: PropertyValue
    value: 0.043
  additional property: Acousticness
    type: PropertyValue
    value: 0.995
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.952
  additional property: Liveness
    type: PropertyValue
    value: 0.074
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.076
  additional property: Loudness (dB)
    type: PropertyValue
    value: -33.475
  additional property: Key Name
    type: PropertyValue
    value: C#
  additional property: Mode Name
    type: PropertyValue
    value: Minor

16 Waltzes, Op. 39 (Version for Piano Duet): No. 8 in B-Flat Major
type: MusicRecording
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16 Waltzes, Op. 39 (Version for Piano Duet): No. 9 in D Minor
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Tal & Groethuysen play Gouvy
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Felix & Fanny Mendelssohn: Piano Music for 4 Hands
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Schafe können sicher weiden, BWV 208, No. 9 (Arr. for Two Pianos by Mary Howe)
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Nun komm der Heiden Heiland, BWV 659 (Arr. for Two Pianos by Alexander Kelberine)
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Sonata in D Minor, BWV 964: III. Andante (Arr. for Two Pianos by Cyril Scott)
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Jesus bleibet meine Freude, BWV 147, No. 10 (Arr. for Two Pianos by Victor Babin)
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II. Adagio cantabile
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II. Marche. Trio. Marche
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Studie 7: Nicht zu schnell (Contrapunctus 7 per Augmentationem et Diminutionem)
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Goldberg Variations, BWV 988: 9. Canone alla Terza. Moderato
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