Ruth Slenczynska
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genre: classical piano
description: Ruth Slenczynska (born January 15, 1925) is an American classical pianist and the last living piano student of Sergei Rachmaninoff. Early life Slenczynska was born in Sacramento, California. Her Poli
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album: Música Clásica Para Dormir Bebés
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album: Classical Study Mix
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  track: Gabriel's Oboe - From "The Mission"
album: WOMEN AT THE PIANO - AN ANTHOLOGY OF HISTORIC PERFORMANCES, Vol. 1 (1926-1952)
album: Celebration of Chopin: Encore!
album: 100 Years: The Art of Ruth Slenczynska
album: My Life in Music
album: Ruth Slenczynska - Complete American Decca Recordings
album: Slenczynska Plays Schubert Live
album: Chopin: 4 Scherzi
album: Chopin: 12 Etudes op. 25 / Impromptus op. 51 & 66
album: Chopin: 12 Etudes op. 10 / 2 Impromptus op. 29 & 36
album: Schumann: Carnaval / Kinderszenen / Sonata No. 2
album: The Legacy of a Genius
album: Ruth Slenczynska Plays Chopin And Liszt Live!
album: Chopin: 12 Études, Op. 25; Barcarolle, Op. 60; Tarantella, Op. 43
album: Chopin: 12 Etudes, Op. 10, Trois Nouvelles Etudes, Berceuse, Op. 57, Three Ecossaises, Op. 72
album: Chopin: 12 Études (Mono Version)
album: Chopin: 12 Études, Op. 10: No. 3 in E Major (Ed. Paderewski)
album: Barber: Fresh from West Chester: II. Let's Sit It Out, I'd Rather Watch
album: Debussy: Préludes / Book 1, L. 117: No. 8, The Girl with the Flaxen Hair
album: Chopin: Berceuse in D-Flat Major, Op. 57
album: Rachmaninoff: 13 Preludes, Op. 32: No. 5 in G Major. Moderato
album: Chopin: Waltz No. 7 in C-Sharp Minor, Op. 64 No. 2 (Live)
album: 'Chromatique' - Chopin Solo Piano Works
album: 'Fantasie Impromptu' and other works by Chopin
album: 'January': A Calendar of Classics: Chopin
album: "Grande valse" - Classical Dances
album: A Romantic Era: The Piano - Chopin
album: "December" - A Season of Piano: Chopin
album: 'Pittoresco' - Classical Masterpieces
album: A Classical Postcard: Chopin
album: A Soundtrack for December
album: The Chopin Masters
album: Abendlied: Romantic Works
album: The Piano – Best of Immersive Audio

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Reminiscence
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audio: Reminiscence
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Fracture
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Gnossienne No. 1 (Arr. Kleynjans)
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subject of: OpenTimestamps Proof of Existence
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24 Preludes, Op. 28: No. 11 in B Major. Vivace - Recorded 1974
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
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Fantaisie-Impromptu in C-Sharp Minor, Op. 66
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subject of: OpenTimestamps Proof of Existence
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12 Etudes, Op. 25: No. 1 In A Flat Major - "Harp Study"
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  date published: 2026-07-02T03:55:08Z
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Mazurka No. 5 in B-Flat Major, Op. 7 No. 1. Vivace
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24 Préludes, Op. 28: No. 7 in A Major
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Polonaise in B-Flat Major, KK IVa/1
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24 Préludes, Op. 28: No. 7 in A Major: Andantino
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
audio: 24 Préludes, Op. 28: No. 7 in A Major: Andantino
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Waltz No. 8 in A-Flat Major, Op. 64 No. 3
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by artist: Vladimir Ashkenazy
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
audio: Waltz No. 8 in A-Flat Major, Op. 64 No. 3
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Les Sylphides: 3. Valse
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by artist: Rotterdam Philharmonic Orchestra
by artist: David Zinman
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Les Sylphides: 3. Valse
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Waltz No. 14 in E Minor, KK IVa/15
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by artist: Frédéric Chopin
by artist: Vladimir Ashkenazy
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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: Waltz No. 14 in E Minor, KK IVa/15
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Mazurka in B flat major (KK 1223)
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by artist: Frédéric Chopin
by artist: Lilya Zilberstein
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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: Mazurka in B flat major (KK 1223)
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24 Préludes, Op. 28: No. 21 in B-Flat Major: Cantabile - Live
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
audio: 24 Préludes, Op. 28: No. 21 in B-Flat Major: Cantabile - Live
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Mazurka in D major (KK 1224)
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by artist: Lilya Zilberstein
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genre: early-romantic-era
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Mazurka in D major (KK 1224)
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Mazurka No. 34 in C Major, Op. 56 No. 2. Vivace
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
audio: Mazurka No. 34 in C Major, Op. 56 No. 2. Vivace
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Waltz No. 6 in D Flat, Op. 64 No. 1 -"Minute"
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by artist: Zoltán Kocsis
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Waltz No. 6 in D Flat, Op. 64 No. 1 -"Minute"
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Waltz No. 7 in C-Sharp Minor, Op. 64 No. 2
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by artist: Maria João Pires
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Waltz No. 7 in C-Sharp Minor, Op. 64 No. 2
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3 Ecossaises, Op. 72 No. 3
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by artist: Mikhail Pletnev
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
audio: 3 Ecossaises, Op. 72 No. 3
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Mazurka No. 36 In A Minor Op. 59 No. 1
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by artist: Martha Argerich
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T05:09:12Z
audio: Mazurka No. 36 In A Minor Op. 59 No. 1
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12 Etudes, Op. 25: No. 2 in F minor
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: 12 Etudes, Op. 25: No. 2 in F minor
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Waltz No. 8 in A-Flat Major, Op. 64, No. 3 (Arr. Godowsky)
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  date published: 2026-07-02T03:55:08Z
audio: Waltz No. 8 in A-Flat Major, Op. 64, No. 3 (Arr. Godowsky)
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Variation sur la marche des Puritains de Bellini, KK Anh. Ia/5 (Var. 6 of Hexaméron by Liszt, S. 392)
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subject of: OpenTimestamps Proof of Existence
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audio: Variation sur la marche des Puritains de Bellini, KK Anh. Ia/5 (Var. 6 of Hexaméron by Liszt, S. 392)
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Mazurka in G major (KK 896-900)
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subject of: OpenTimestamps Proof of Existence
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Piano Sonata No. 2 in B-Flat Minor, Op. 35: IV. Finale (Presto)
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
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Mazurka No. 37 In A Flat Op. 59 No. 2
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Tarantelle in A-Flat Major, Op. 43
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3 Mazurkas, Op. 63: No. 2 In F Minor. Lento
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Waltz No. 5 in A-Flat Major, Op. 42
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24 Préludes, Op. 28, C. 166-189: No. 9 Largo in E Major, C. 174 - Live
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subject of: OpenTimestamps Proof of Existence
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audio: 24 Préludes, Op. 28, C. 166-189: No. 9 Largo in E Major, C. 174 - Live
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3 Mazurkas, Op. 59: No. 1 in A Minor. Moderato
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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Mazurka No. 38 In F Sharp Minor Op. 59 No. 3
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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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Waltz No. 5 in A flat, Op. 42 - "Grande valse"
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T05:09:12Z
audio: Waltz No. 5 in A flat, Op. 42 - "Grande valse"
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12 Etudes, Op. 25: No. 4 In A Minor
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  date published: 2026-07-02T03:55:08Z
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Waltz No. 13 in D-Flat Major, Op. 70 No. 3
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  date published: 2026-07-02T11:38:34Z
audio: Waltz No. 13 in D-Flat Major, Op. 70 No. 3
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Fugue in A Minor, KK IVc/2
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3 Mazurkas, Op. 59: No. 3 in F-Sharp Minor. Vivace
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12 Etudes, Op. 25: No. 2 in F Minor
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Piano Sonata No. 3 in B Minor, Op. 58: II. Scherzo. Molto vivace - Live
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12 Etudes, Op. 25: No. 2 In F Minor
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Introduction And Polonaise, Op. 3: Introduction - Lento - Excerpt / Live At Concert Hall, Kyoto / 2000
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Les Sylphides: 6. Prélude
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Mazurka No. 22 in G sharp minor, Op. 33 No. 1
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24 Préludes, Op. 28, C. 166-189: No. 20. Largo in C Minor, C. 185 - Live
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OpenTimestamps Proof of Existence
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12 Études, Op. 25: No. 2 in F Minor
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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: 2026-07-08T08:56:20Z
audio: 12 Études, Op. 25: No. 4 in A Minor
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12 Études, Op. 25: No. 11 in A Minor
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by artist: Ruth Slenczynska
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genre: classical
genre: early-romantic-era
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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: 2026-07-08T03:39:04Z
audio: 12 Études, Op. 25: No. 11 in A Minor
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12 Études, Op. 25: No. 12 in C Minor
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by artist: Ruth Slenczynska
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genre: classical
genre: early-romantic-era
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: 12 Études, Op. 25: No. 12 in C Minor
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2 Waltzes, Op. 69: No. 1. Waltz in A-Flat Major
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by artist: Ruth Slenczynska
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genre: early-romantic-era
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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: 2026-07-08T03:22:41Z
audio: 2 Waltzes, Op. 69: No. 1. Waltz in A-Flat Major
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2 Waltzes, Op. 69: No. 2 Waltz in B Minor
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by artist: Ruth Slenczynska
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genre: early-romantic-era
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: 2 Waltzes, Op. 69: No. 2 Waltz in B Minor
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24 Preludes, Op. 28: No. 1 in C Major: Agitato
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by artist: Ruth Slenczynska
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genre: classical
genre: early-romantic-era
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additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: OTSVerificationAPI
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: 24 Preludes, Op. 28: No. 1 in C Major: Agitato
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24 Preludes, Op. 28: No. 15 in D-Flat Major: Sostenuto
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by artist: Ruth Slenczynska
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genre: classical
genre: early-romantic-era
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: 24 Preludes, Op. 28: No. 15 in D-Flat Major: Sostenuto
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My Life in Music
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date published: 2022-03-18
track: 6 Romances, Op. 38: No. 3, Daisies
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track: Nocturne 'Homage to John Field', Op. 33
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track: Berceuse in D-Flat Major, Op. 57
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OpenTimestamps Proof of Existence
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date published: 2026-07-07T14:04:01Z

Nocturne 'Homage to John Field', Op. 33
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Grand valse brillante in E-Flat Major, Op. 18 (Ed. Paderewski)
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Berceuse in D-Flat Major, Op. 57
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Préludes / Book 1, L. 117: No. 8, The Girl with the Flaxen Hair
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12 Études, Op. 10: No. 3 in E Major (Ed. Paderewski)
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Ruth Slenczynska - Complete American Decca Recordings
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Slenczynska Plays Schubert Live
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Chopin: 4 Scherzi
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Chopin: 12 Etudes op. 25 / Impromptus op. 51 & 66
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Chopin: 12 Etudes op. 10 / 2 Impromptus op. 29 & 36
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Schumann: Carnaval / Kinderszenen / Sonata No. 2
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The Legacy of a Genius
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Ruth Slenczynska Plays Chopin And Liszt Live!
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Chopin: 12 Études, Op. 25; Barcarolle, Op. 60; Tarantella, Op. 43
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Chopin: 12 Etudes, Op. 10, Trois Nouvelles Etudes, Berceuse, Op. 57, Three Ecossaises, Op. 72
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Debussy: Préludes / Book 1, L. 117: No. 8, The Girl with the Flaxen Hair
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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
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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
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  subject of: OpenTimestamps Proof of Existence
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OTSVerificationAPI
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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

OpenTimestamps Proof of Existence
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date published: 2026-07-08T03:53:27Z

Introduction and Variations on a German National Air Op. posth. (KK 925-927) - Pt. 2
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Introduction and Variations on a German National Air Op. posth. (KK 925-927) - Pt. 3
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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: Introduction and Variations on a German National Air Op. posth. (KK 925-927) - Pt. 3
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Introduction and Variations on a German National Air Op. posth. (KK 925-927) - Pt. 4
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Introduction and Variations on a German National Air Op. posth. (KK 925-927) - Pt. 4
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
audio: Ballade No. 1 in G Minor, Op. 23 - Pt. 1
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    type: PropertyValue
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
    value: 6
  additional property: Danceability
    type: PropertyValue
    value: 0.615
  additional property: Energy
    type: PropertyValue
    value: 0.003
  additional property: Speechiness
    type: PropertyValue
    value: 0.139
  additional property: Acousticness
    type: PropertyValue
    value: 0.993
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.917
  additional property: Liveness
    type: PropertyValue
    value: 0.08
  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
    type: PropertyValue
    value: Major

Ballade No. 1 in G Minor, Op. 23 - Pt. 3
type: MusicRecording
duration: PT0M50S
duration ms: 50946
explicit: false
by artist: Frédéric Chopin
by artist: Tamás Vásáry
in album: 'Chromatique' - Chopin Solo Piano Works
  type: MusicAlbum
  date published: 2025-01-08
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056507163
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
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additional property: CopyrightRegisteredAt
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  value: 2026-07-03T02:02:37+00:00
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xd6713c4dfc1793fc0d7eb38d53ed034e97a8e8db1e286b7fe0c4cebc1fca7afa
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 957120
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957120
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056507163
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 0xd6713c4dfc1793fc0d7eb38d53ed034e97a8e8db1e286b7fe0c4cebc1fca7afa. 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/DEF056507163.
  date published: 2026-07-08T03:22:41Z
audio: Ballade No. 1 in G Minor, Op. 23 - Pt. 3
  type: AudioObject
  additional property: Tempo (BPM)
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    value: 119.229
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
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    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.363
  additional property: Energy
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    value: 0.229
  additional property: Speechiness
    type: PropertyValue
    value: 0.043
  additional property: Acousticness
    type: PropertyValue
    value: 0.991
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.841
  additional property: Liveness
    type: PropertyValue
    value: 0.127
  additional property: Valence (Positivity)
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    value: 0.137
  additional property: Loudness (dB)
    type: PropertyValue
    value: -22.388
  additional property: Key Name
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  additional property: Mode Name
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Ballade No. 1 in G Minor, Op. 23 - Pt. 6
type: MusicRecording
duration: PT0M37S
duration ms: 37280
explicit: false
by artist: Frédéric Chopin
by artist: Tamás Vásáry
in album: 'Chromatique' - Chopin Solo Piano Works
  type: MusicAlbum
  date published: 2025-01-08
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056507166
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
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additional property: CopyrightRegisteredAt
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  value: 2026-07-07T06:53:53+00:00
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xcd27200467f88ef70a80f485c58da9f89031c7b840d6a68e40fe259dd78c3210
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957118
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056507166
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 0xcd27200467f88ef70a80f485c58da9f89031c7b840d6a68e40fe259dd78c3210. 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/DEF056507166.
  date published: 2026-07-08T03:20:19Z
audio: Ballade No. 1 in G Minor, Op. 23 - Pt. 6
  type: AudioObject
  additional property: Tempo (BPM)
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    value: 110.944
  additional property: Musical Key
    type: PropertyValue
    value: 4
  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.344
  additional property: Energy
    type: PropertyValue
    value: 0.293
  additional property: Speechiness
    type: PropertyValue
    value: 0.034
  additional property: Acousticness
    type: PropertyValue
    value: 0.978
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.888
  additional property: Liveness
    type: PropertyValue
    value: 0.273
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.587
  additional property: Loudness (dB)
    type: PropertyValue
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  additional property: Key Name
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  additional property: Mode Name
    type: PropertyValue
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Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 1
type: MusicRecording
duration: PT0M36S
duration ms: 36000
explicit: false
by artist: Frédéric Chopin
by artist: Arturo Benedetti Michelangeli
in album: 'Chromatique' - Chopin Solo Piano Works
  type: MusicAlbum
  date published: 2025-01-08
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF057104411
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T13:41:41+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf2dd9ae74dd9ffd35c3fdc669ae016a98335f17d8d8e7b48ff51c2fc45230885
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/DEF057104411
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 0xf2dd9ae74dd9ffd35c3fdc669ae016a98335f17d8d8e7b48ff51c2fc45230885. 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/DEF057104411.
  date published: 2026-07-08T08:56:20Z
audio: Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 1
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 116.743
  additional property: Musical Key
    type: PropertyValue
    value: 10
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.639
  additional property: Energy
    type: PropertyValue
    value: 0.021
  additional property: Speechiness
    type: PropertyValue
    value: 0.068
  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
    type: PropertyValue
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  additional property: Liveness
    type: PropertyValue
    value: 0.1
  additional property: Valence (Positivity)
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    value: 0
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.046
  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
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Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 8
type: MusicRecording
duration: PT0M41S
duration ms: 41813
explicit: false
by artist: Frédéric Chopin
by artist: Arturo Benedetti Michelangeli
in album: 'Chromatique' - Chopin Solo Piano Works
  type: MusicAlbum
  date published: 2025-01-08
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF057104418
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T13:13:19+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd09ef25c1e6382ef2806fe9272ff29aebe9a54a5e78196c47a1b3e9712d6b21e
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/DEF057104418
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 0xd09ef25c1e6382ef2806fe9272ff29aebe9a54a5e78196c47a1b3e9712d6b21e. 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/DEF057104418.
  date published: 2026-07-08T03:20:19Z
audio: Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 8
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 106.235
  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: 0.332
  additional property: Energy
    type: PropertyValue
    value: 0.007
  additional property: Speechiness
    type: PropertyValue
    value: 0.043
  additional property: Acousticness
    type: PropertyValue
    value: 0.994
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.932
  additional property: Liveness
    type: PropertyValue
    value: 0.089
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.502
  additional property: Loudness (dB)
    type: PropertyValue
    value: -39.87
  additional property: Key Name
    type: PropertyValue
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  additional property: Mode Name
    type: PropertyValue
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Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 9
type: MusicRecording
duration: PT0M47S
duration ms: 47120
explicit: false
by artist: Frédéric Chopin
by artist: Arturo Benedetti Michelangeli
in album: 'Chromatique' - Chopin Solo Piano Works
  type: MusicAlbum
  date published: 2025-01-08
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF057104419
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T17:07:43+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9eb204c4066fafa8bc2e3a308300ae38485941efd1f8125573d108662851fc5c
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957120
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957120
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057104419
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 0x9eb204c4066fafa8bc2e3a308300ae38485941efd1f8125573d108662851fc5c. 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/DEF057104419.
  date published: 2026-07-08T03:22:41Z
audio: Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 9
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 152.764
  additional property: Musical Key
    type: PropertyValue
    value: 6
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.273
  additional property: Energy
    type: PropertyValue
    value: 0.218
  additional property: Speechiness
    type: PropertyValue
    value: 0.039
  additional property: Acousticness
    type: PropertyValue
    value: 0.985
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.844
  additional property: Liveness
    type: PropertyValue
    value: 0.109
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.223
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.975
  additional property: Key Name
    type: PropertyValue
    value: F#
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 11
type: MusicRecording
duration: PT0M35S
duration ms: 35560
explicit: false
by artist: Frédéric Chopin
by artist: Arturo Benedetti Michelangeli
in album: 'Chromatique' - Chopin Solo Piano Works
  type: MusicAlbum
  date published: 2025-01-08
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF057104421
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T10:57:19+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9c03b48620fda66b3892d1d27565ddc7e2e13410778e10d70eba54ac48db6b09
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/DEF057104421
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 0x9c03b48620fda66b3892d1d27565ddc7e2e13410778e10d70eba54ac48db6b09. 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/DEF057104421.
  date published: 2026-07-08T08:56:20Z
audio: Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 11
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 164.774
  additional property: Musical Key
    type: PropertyValue
    value: 10
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 6
  additional property: Danceability
    type: PropertyValue
    value: 0.536
  additional property: Energy
    type: PropertyValue
    value: 0.027
  additional property: Speechiness
    type: PropertyValue
    value: 0.075
  additional property: Acousticness
    type: PropertyValue
    value: 0.983
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.615
  additional property: Liveness
    type: PropertyValue
    value: 0.097
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.331
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.948
  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Minor

Scherzo No. 2 in B-Flat Minor, Op. 31: Presto - Sostenuto - Pt. 13
type: MusicRecording
duration: PT0M43S
duration ms: 43773
explicit: false
by artist: Frédéric Chopin
by artist: Arturo Benedetti Michelangeli
in album: 'Chromatique' - Chopin Solo Piano Works
  type: MusicAlbum
  date published: 2025-01-08
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF057104423
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T21:03:06+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x79a9332e5d9af739100e0ed9f46ceda44c545017f772478e0c719fa972734ed9
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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  value: https://blockstream.info/api/block-height/957145
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057104423
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
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3 Waltzes, Op. 64: Waltz No. 6 In D Flat, Op. 64 No. 1 "Minute" - Edit
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track: Mazurka No. 54 in D: Allegro non troppo
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track: 12 Etudes, Op. 10: No. 4 In C Sharp Minor
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Mazurka No. 54 in D: Allegro non troppo
type: MusicRecording
duration: PT1M11S
duration ms: 71213
explicit: false
by artist: Frédéric Chopin
by artist: Tamás Vásáry
in album: 'Fantasie Impromptu' and other works by Chopin
  type: MusicAlbum
  date published: 2025-01-09
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056500620
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957120
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056500620
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 0x1e76dc20c4e90d00c8e6207159ce1c2c1a14a8a085b833526ba1511c576a4925. 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/DEF056500620.
  date published: 2026-07-08T03:22:41Z
audio: Mazurka No. 54 in D: Allegro non troppo
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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
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  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Mazurka No. 15 In C Op. 24 No. 2
type: MusicRecording
duration: PT1M52S
duration ms: 112800
explicit: false
by artist: Frédéric Chopin
by artist: Martha Argerich
in album: 'Fantasie Impromptu' and other works by Chopin
  type: MusicAlbum
  date published: 2025-01-09
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056730650
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957120
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056730650
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 0x7ebb74535d8d662913e282d6c33ff7b4d2208f4fcb11bf334ac384da347dc744. 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/DEF056730650.
  date published: 2026-07-08T03:22:41Z
audio: Mazurka No. 15 In C Op. 24 No. 2
  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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  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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12 Etudes, Op. 10: No. 4 In C Sharp Minor
type: MusicRecording
duration: PT1M56S
duration ms: 116226
explicit: false
by artist: Frédéric Chopin
by artist: Martha Argerich
in album: 'Fantasie Impromptu' and other works by Chopin
  type: MusicAlbum
  date published: 2025-01-09
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056730800
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
  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/DEF056730800
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 0x2d1c5c0f3545289757e7ca033a5188afbbde62835711e38b5f5b0d9eb2ca517e. 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/DEF056730800.
  date published: 2026-07-08T03:53:27Z
audio: 12 Etudes, Op. 10: No. 4 In C Sharp Minor
  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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  additional property: Time Signature
    type: PropertyValue
    value: 5
  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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Mazurka No. 26 In C Sharp Minor Op. 41 No. 4
type: MusicRecording
duration: PT2M56S
duration ms: 176080
explicit: false
by artist: Frédéric Chopin
by artist: Martha Argerich
in album: 'Fantasie Impromptu' and other works by Chopin
  type: MusicAlbum
  date published: 2025-01-09
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056730580
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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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957122
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056730580
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 0xa041f06bc75fb0758e6a1412e0effe8b2992e27bc408dded818075d5e5837a55. 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/DEF056730580.
  date published: 2026-07-08T03:39:04Z
audio: Mazurka No. 26 In C Sharp Minor Op. 41 No. 4
  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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  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
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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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Mazurka No. 37 In A Flat Op. 59 No. 2
type: MusicRecording
duration: PT2M23S
duration ms: 143813
explicit: false
by artist: Frédéric Chopin
by artist: Martha Argerich
in album: 'Fantasie Impromptu' and other works by Chopin
  type: MusicAlbum
  date published: 2025-01-09
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056730730
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-25T08:06:16+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
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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/DEF056730730
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 0xe57bc4748f6826fd3bbbbfb3f9d59bf54db854733696ced611af445cfbe0e2fe. 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/DEF056730730.
  date published: 2026-07-08T03:22:41Z
audio: Mazurka No. 37 In A Flat Op. 59 No. 2
  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
    value: 5
  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
    type: PropertyValue
    value: 0.042
  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)
    type: PropertyValue
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  additional property: Loudness (dB)
    type: PropertyValue
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  additional property: Key Name
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  additional property: Mode Name
    type: PropertyValue
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Mazurka No. 38 In F Sharp Minor Op. 59 No. 3
type: MusicRecording
duration: PT2M52S
duration ms: 172626
explicit: false
by artist: Frédéric Chopin
by artist: Martha Argerich
in album: 'Fantasie Impromptu' and other works by Chopin
  type: MusicAlbum
  date published: 2025-01-09
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056730740
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-25T18:45:09+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957124
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056730740
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 0x29530e018991179bce3df6084812f247d29b4c19a6280706711f4486cd1bb7c7. 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/DEF056730740.
  date published: 2026-07-08T03:53:27Z
audio: Mazurka No. 38 In F Sharp Minor Op. 59 No. 3
  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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  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
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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  additional property: Key Name
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12 Etudes, Op. 10: No. 6 In E Flat Minor
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duration: PT3M19S
duration ms: 199089
explicit: false
by artist: Frédéric Chopin
by artist: Tamás Vásáry
in album: 'Fantasie Impromptu' and other works by Chopin
  type: MusicAlbum
  date published: 2025-01-09
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: DEF056530106
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T15:49:02+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
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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/DEF056530106
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 0xcec364be7492e4f0e6a019a24b7bd4f59dcdd0b42d3975a3a5d3d6453ded200f. 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/DEF056530106.
  date published: 2026-07-08T08:56:20Z
audio: 12 Etudes, Op. 10: No. 6 In E Flat Minor
  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: 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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12 Études, Op. 10: No. 12 in C Minor "Revolutionary"
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
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12 Études, Op. 25: No. 5 in E Minor "Wrong Note"
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subject of: OpenTimestamps Proof of Existence
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Piano Sonata No. 2 in B-Flat Minor, Op. 35: III. Marche funèbre - Pt. 1
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subject of: OpenTimestamps Proof of Existence
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24 Préludes, Op. 28: No. 4 in E Minor
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: 24 Préludes, Op. 28: No. 4 in E Minor
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24 Préludes, Op. 28: No. 15 in D-Flat Major : Sostenuto - Pt. 2
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12 Etudes, Op. 10: No. 10 in A-Flat Major
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audio: 12 Etudes, Op. 10: No. 10 in A-Flat Major
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Nocturne No. 2 in E-Flat Major, Op. 9 No. 2
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Mazurka No. 5 in B flat Op. 7 No. 1
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duration: PT2M33S
duration ms: 153000
explicit: false
by artist: Frédéric Chopin
by artist: Jean-Marc Luisada
in album: 'Fantasie Impromptu' and other works by Chopin
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genre: classical
genre: early-romantic-era
genre: polish-classical
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  date published: 2026-07-08T03:53:27Z
audio: Mazurka No. 5 in B flat Op. 7 No. 1
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Mazurka No. 14 in G minor Op. 24 No. 1
type: MusicRecording
duration: PT2M52S
duration ms: 172000
explicit: false
by artist: Frédéric Chopin
by artist: Jean-Marc Luisada
in album: 'Fantasie Impromptu' and other works by Chopin
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  date published: 2025-01-09
genre: classical
genre: early-romantic-era
genre: polish-classical
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additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  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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  date published: 2026-07-08T08:56:20Z
audio: Mazurka No. 14 in G minor Op. 24 No. 1
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'January': A Calendar of Classics: Chopin
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track: 12 Etudes, Op. 10: No. 2 In A Minor - "Chromatique"
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    type: MusicAlbum
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  genre: classical
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  additional property: OTSVerificationAPI
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  additional property: OTSTimestamp
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  additional property: OTSVerifyInstructions
    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 0xce63bb2d340ef06c61106e63e4f2d83c71d822629ba802d50745dde5043492cf. 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/GBF071440202.
    date published: 2026-07-08T03:22:41Z
  audio: 12 Etudes, Op. 10: No. 2 In A Minor - "Chromatique"
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track: 12 Études, Op. 10: No. 11 in E-Flat Major
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  by artist: Ruth Slenczynska
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    type: MusicAlbum
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  genre: classical
  genre: early-romantic-era
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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 0x535c8ec4e939a5063351c07e4e28ba3d22abf50086a2480b8d47e250dea5abd6. 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/DEF055634211.
    date published: 2026-07-08T08:56:20Z
  audio: 12 Études, Op. 10: No. 11 in E-Flat Major
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    additional property: Tempo (BPM)
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    additional property: Valence (Positivity)
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track: 12 Etudes, Op. 10: No. 4 in C Sharp Minor
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  by artist: Yeol Eum Son
  in album: 'January': A Calendar of Classics: Chopin
    type: MusicAlbum
    date published: 2025-01-11
  genre: classical
  genre: early-romantic-era
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  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
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  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
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CopyrightChainExplorerURL
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OTSHash
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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 0xd2ceab27a65e367e2e02bf108b869405b92b72fbbcb8eb548aec70a4362b1d9e. 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/KRUM71100097.
date published: 2026-07-08T08:56:20Z

12 Etudes, Op. 10: No. 4 in C Sharp Minor
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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
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additional property: Danceability
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additional property: Energy
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additional property: Speechiness
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additional property: Acousticness
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additional property: Instrumentalness
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additional property: Liveness
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additional property: Valence (Positivity)
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additional property: Loudness (dB)
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additional property: Mode Name
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"Grande valse" - Classical Dances
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track: Waltz No. 1 in E-Flat Major, Op. 18 "Grande valse brillante" - Pt. 2
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  genre: classical
  genre: early-romantic-era
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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
    type: DigitalDocument
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    date published: 2026-07-08T08:56:20Z
  audio: Waltz No. 1 in E-Flat Major, Op. 18 "Grande valse brillante" - Pt. 2
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    additional property: Mode (Major/Minor)
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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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: Waltz No. 1 in E-Flat Major, Op. 18 "Grande valse brillante" - Pt. 4
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Waltz No. 1 in E-Flat Major, Op. 18 "Grande valse brillante" - Pt. 5
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Waltz No. 9 in A-Flat Major, Op. 69 No. 1 "Farewell" - Pt. 3
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Waltz No. 15 in E Major, Op. posth.: Tempo di Valse
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Serenade in C Major, K. 648 "A Very Little Night Music" (Original Version for 2 Violins & Bass): VI. Menuet [II] – Trio - World Premiere Recording
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Mazurka No. 11 in E minor Op. 17 No. 2
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Mazurka in B flat major (KK 1223)
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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Mazurka No. 50 in F Op 68 No. 3
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by artist: Jean-Marc Luisada
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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audio: Mazurka No. 50 in F Op 68 No. 3
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Les Sylphides (Orch. Douglas): III. Waltz No. 11 in G Major, Op. 70 No. 1
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subject of: OpenTimestamps Proof of Existence
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audio: Les Sylphides (Orch. Douglas): III. Waltz No. 11 in G Major, Op. 70 No. 1
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3 Ecossaises, Op. 72 No. 3: No. 1 in D Major
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subject of: OpenTimestamps Proof of Existence
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audio: 3 Ecossaises, Op. 72 No. 3: No. 1 in D Major
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2 Bourrees, B160b: No. 2 In A Major
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
audio: 2 Bourrees, B160b: No. 2 In A Major
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Mazurka in B flat major (KK 891-895)
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audio: Mazurka in B flat major (KK 891-895)
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A Romantic Era: The Piano - Chopin
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track: 24 Préludes, Op. 28: 3. In G Major
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track: 24 Préludes, Op. 28: 9. In E Major
track: Impromptu No. 4 in C-Sharp Minor, Op. 66 "Fantaisie-Impromptu"

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OTSVerificationAPI
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OTSTimestamp
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OTSVerifyInstructions
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OpenTimestamps Proof of Existence
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date published: 2026-07-08T03:53:27Z

24 Préludes, Op. 28: 6. In B Minor
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24 Préludes, Op. 28: 9. In E Major
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by artist: Friedrich Gulda
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
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Impromptu No. 4 in C-Sharp Minor, Op. 66 "Fantaisie-Impromptu"
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
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"December" - A Season of Piano: Chopin
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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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'Pittoresco' - Classical Masterpieces
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:53:27Z
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track: Swan Lake, Op. 20, TH.12 / Act 1: No. 7 Sujet
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    date published: 2026-07-08T03:53:27Z
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track: Aphorisms, Op. 13: 4. Elegy
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track: Pictures at an Exhibition (Orch. by Maurice Ravel): 3. Promenade. Moderato commodo assai e con delicatezza

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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

OpenTimestamps Proof of Existence
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date published: 2026-07-08T03:53:27Z

Aphorisms, Op. 13: 4. Elegy
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Pictures at an Exhibition (Orch. by Maurice Ravel): 3. Promenade. Moderato commodo assai e con delicatezza
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subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:53:27Z
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OpenTimestamps Proof of Existence
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date published: 2026-07-08T03:22:41Z

12 Etudes, Op. 10: No. 2 In A Minor - "Chromatique"
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The Chopin Masters
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Abendlied: Romantic Works
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