Signum Quartet
type: MusicGroup
genre: chamber music
description: The Signum Quartet is a string quartet based in Bremen, Germany. Founded in 1994, it has been playing in the current formation since 2016.Florian Donderer appointed Signum Quartet first violinist. Web
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    subject of: OpenTimestamps Proof of Existence
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album: Widmann: Viola Concerto
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-08T03:20:19Z
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  track: String Quartet No. 3 "Jagdquartett"
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album: LiederZwerge - Musik aus dem Baby-Konzert

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Viola Concerto: III. Poco vivo subito
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String Quartet No. 3 "Jagdquartett"
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Thuille: String Quartets
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Erkki-Sven Tüür: Lost Prayers
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Schubert: Famous Pieces
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    date published: 2026-07-02T03:55:08Z
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track: Ave Maria, Op. 52 No. 6, D. 839
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    date published: 2026-07-30T09:37:10Z
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  subject of: OpenTimestamps Proof of Existence
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track: Violin Sonata in A Minor, Op. 137 No. 2, D. 385: II. Andante
track: String Quintet in C Major, Op. 163, D. 956: IV. Allegretto - Più allegro
track: Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: III. Scherzando. Allegro moderato
track: Winterreise, Op. 89, D. 911 (Excerpts): No. 20, Der Wegweiser
track: Symphony No. 2 in B-Flat Major, D. 125: II. Andante
track: Du bist die Ruh, Op. 59 No. 3, D. 776 (Arr. X. van Dijk for String Quartet)
track: Piano Sonata in B-Flat Major, D. 960: III. Scherzo. Allegro vivace con delicatezza
track: Violin Sonata in D Major, Op. 137 No. 1, D. 384: II. Andante
track: Piano Sonata in C Minor, D. 958: III. Menuetto. Allegro
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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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch

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

Piano Quintet in A Major, Op. 114, D. 667 "Die Forelle": II. Andante
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Violin Sonata in A Minor, Op. 137 No. 2, D. 385: II. Andante
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by artist: Julia Fischer
by artist: Martin Helmchen
in album: Schubert: Famous Pieces
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genre: classical-piano
genre: chamber-music
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T22:27:30Z
audio: Violin Sonata in A Minor, Op. 137 No. 2, D. 385: II. Andante
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String Quintet in C Major, Op. 163, D. 956: IV. Allegretto - Più allegro
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by artist: Matt Haimovitz
by artist: Miró Quartet
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genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightID
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additional property: OTSVerificationAPI
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T02:51:48Z
audio: String Quintet in C Major, Op. 163, D. 956: IV. Allegretto - Più allegro
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Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: III. Scherzando. Allegro moderato
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by artist: Franz Schubert
by artist: Storioni Trio
in album: Schubert: Famous Pieces
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genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightID
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additional property: OTSVerificationAPI
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: III. Scherzando. Allegro moderato
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Winterreise, Op. 89, D. 911 (Excerpts): No. 20, Der Wegweiser
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in album: Schubert: Famous Pieces
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genre: classical
genre: classical-piano
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T20:42:35Z
audio: Winterreise, Op. 89, D. 911 (Excerpts): No. 20, Der Wegweiser
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Symphony No. 2 in B-Flat Major, D. 125: II. Andante
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duration: PT7M7S
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by artist: B'Rock Orchestra
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in album: Schubert: Famous Pieces
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genre: classical
genre: classical-piano
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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Du bist die Ruh, Op. 59 No. 3, D. 776 (Arr. X. van Dijk for String Quartet)
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Piano Sonata in B-Flat Major, D. 960: III. Scherzo. Allegro vivace con delicatezza
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T21:25:57Z
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Violin Sonata in D Major, Op. 137 No. 1, D. 384: II. Andante
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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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Piano Sonata in C Minor, D. 958: III. Menuetto. Allegro
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  date published: 2026-07-31T21:25:57Z
audio: Piano Sonata in C Minor, D. 958: III. Menuetto. Allegro
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Erlkönig, Op. 1, D. 328 (Arr. M. Reger for Voice & Orchestra)
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  date published: 2026-07-08T03:20:19Z
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Rondo in A Major, D. 438
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Schubert Famous Pieces
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Relaxing Contemporary Classical
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Premium Klassik
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Classical for Sleeping
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track: Songs Without Words, Book 2, Op. 30: No. 6 in F-Sharp Minor, MWV U 110 "Venetianisches Gondellied"
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track: Pictures at an Exhibition: Promenade III
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track: Waldszenen, Op. 82: No. 3, Einsame Blumen
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date published: 2026-07-08T03:20:19Z

Pictures at an Exhibition: Promenade III
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Pavane pour une infante défunte, M. 19 (Version for Orchestra)
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T19:35:34Z
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7 Fantasien, Op. 116: No. 4 in E Major, Intermezzo
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subject of: OpenTimestamps Proof of Existence
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Violin Concerto No. 3 in G Major, K. 216: II. Adagio
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Piano Sonata No. 25 in G Major, Op. 79: II. Andante
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Piano Sonata No. 25 in G Major, Op. 79: II. Andante
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Piano Concerto No. 1 in G Minor, Op. 25, MWV O 7: II. Andante
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by artist: Martin Helmchen
by artist: Antwerp Symphony Orchestra
by artist: Philippe Herreweghe
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popularity: 1
genre: classical
genre: early-romantic-era
genre: german-romanticism
genre: classical-piano
genre: choral
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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: Piano Concerto No. 1 in G Minor, Op. 25, MWV O 7: II. Andante
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Symphonic Metamorphosis After Themes by Carl Maria von Weber: III. Andantino
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by artist: West German Radio Symphony Orchestra
by artist: Marek Janowski
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Symphonic Metamorphosis After Themes by Carl Maria von Weber: III. Andantino
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Waldszenen, Op. 82: No. 3, Einsame Blumen
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by artist: Martin Helmchen
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popularity: 1
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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: 2026-07-08T03:20:19Z
audio: Waldszenen, Op. 82: No. 3, Einsame Blumen
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Violin Sonata in D Major, Op. 137 No. 1, D. 384: II. Andante
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by artist: Julia Fischer
by artist: Martin Helmchen
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popularity: 1
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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: Violin Sonata in D Major, Op. 137 No. 1, D. 384: II. Andante
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Piano Sonata No. 31 in A-Flat Major, Op. 110: III. Adagio ma non troppo. Arioso dolente
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popularity: 1
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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: Piano Sonata No. 31 in A-Flat Major, Op. 110: III. Adagio ma non troppo. Arioso dolente
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Thaïs: Méditation
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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: Thaïs: Méditation
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Wandrers Nachtlied, Op. 96 No. 3, D. 768 (Arr. X. van Dijk for String Quartet)
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popularity: 1
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Wandrers Nachtlied, Op. 96 No. 3, D. 768 (Arr. X. van Dijk for String Quartet)
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O salutaris hostia
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by artist: Natalie Campbell
by artist: Julianna Emanski
by artist: South Dakota Chorale
by artist: Brian A. Schmidt
in album: Classical for Sleeping
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popularity: 1
genre: choral
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: O salutaris hostia
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Gymnopédie No. 1 (Arr. for Guitar)
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by artist: Sean Shibe
in album: Classical for Sleeping
  type: MusicAlbum
  date published: 2022-08-05
popularity: 1
genre: classical
genre: classical-piano
genre: impressionism
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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: 2026-07-30T15:42:38Z
audio: Gymnopédie No. 1 (Arr. for Guitar)
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Abendstern, D. 806 (Arr. X. van Dijk for String Quartet)
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by artist: Franz Schubert
by artist: Signum Quartet
in album: Classical for Sleeping
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  date published: 2022-08-05
popularity: 1
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Abendstern, D. 806 (Arr. X. van Dijk for String Quartet)
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String Quartet No. 16 in F Major, Op. 135: III. Lento assai, cantante e tranquillo (Arr. M. Mussorgsky for Piano)
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duration ms: 613640
explicit: false
by artist: Ludwig van Beethoven
by artist: Mari Kodama
in album: Classical for Sleeping
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  date published: 2022-08-05
popularity: 1
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: NLE421903806
additional property: CopyrightID
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: String Quartet No. 16 in F Major, Op. 135: III. Lento assai, cantante e tranquillo (Arr. M. Mussorgsky for Piano)
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Limoncello: Celebrating Chamber Music
type: MusicAlbum
date published: 2021-09-17

Schubert: Ins stille Land
type: MusicAlbum
date published: 2020-11-13
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    date published: 2020-11-13
  popularity: 2
  genre: classical
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  additional property: OTSVerificationAPI
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  additional property: OTSTimestamp
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  additional property: OTSVerifyInstructions
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    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
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    date published: 2026-07-08T03:39:04Z
  audio: Ins stille Land, D. 403 (Arr. X. van Dijk for String Quartet)
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track: Frühlingsglaube, D. 686 (Arr. X. van Dijk for String Quartet)
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  additional property: OTSVerifyInstructions
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    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
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    date published: 2026-06-13T13:32:09Z
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  subject of: OpenTimestamps Proof of Existence
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track: Auf dem Wasser zu singen, Op. 72, D. 774 (Arr. X. van Dijk for String Quartet)
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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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch

OpenTimestamps Proof of Existence
type: DigitalDocument
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date published: 2026-07-02T03:30:09Z

Abendstern, D. 806 (Arr. X. van Dijk for String Quartet)
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Auf dem Wasser zu singen, Op. 72, D. 774 (Arr. X. van Dijk for String Quartet)
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by artist: Franz Schubert
by artist: Signum Quartet
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popularity: 3
genre: classical
genre: classical-piano
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  date published: 2026-07-08T03:20:19Z
audio: Auf dem Wasser zu singen, Op. 72, D. 774 (Arr. X. van Dijk for String Quartet)
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Schwanengesang, Op. 23 No. 3, D. 744 (Arr. X. van Dijk for String Quartet)
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by artist: Franz Schubert
by artist: Signum Quartet
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popularity: 3
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: CopyrightID
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Schwanengesang, Op. 23 No. 3, D. 744 (Arr. X. van Dijk for String Quartet)
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Beethoven - Quatuors à cordes Opus 130 & 133
type: MusicAlbum
date published: 2020-01-10

Schubert: Aus der Ferne
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  genre: chamber-music
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  additional property: OTSVerificationAPI
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  additional property: OTSTimestamp
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  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-08-01T02:22:04Z
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  additional property: OTSVerificationAPI
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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
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    date published: 2026-07-02T03:30:09Z
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Alla czeca
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Sound Escapes
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No. 3
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Quartettsätze
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Schubert: Lebensmuth, D. 937 (Fragment)
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Schubert: An die Nachtigall, D. 497
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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-31T18:48:12Z
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Horn Quintets
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date published: 2011-09-06
track: Romanze (arr. of Mozart's Horn Concerto No. 3 in E-Flat Major, K. 447: II. Romance: Larghetto)
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  by artist: Nury Guarnaschelli
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  audio: Romanze (arr. of Mozart's Horn Concerto No. 3 in E-Flat Major, K. 447: II. Romance: Larghetto)
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Melancholy Classical
type: MusicAlbum
date published: 2024-07-05

Solemn Classical
type: MusicAlbum
date published: 2024-07-12

LiederZwerge - Musik aus dem Baby-Konzert
type: MusicAlbum
date published: 2017-09-08