Takács Quartet
type: MusicGroup
genre: chamber music
genre: classical
description: The Takács Quartet is a string quartet founded in Budapest, Hungary, and now based in Boulder, Colorado, United States. History In 1975, four students at the Franz Liszt Academy of Music in Budapes
popularity: 31
followers: 8864
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album: A Selection of Schubert & Brahms: Takács Quartet
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album: Janáček: String Quartets Nos. 1 & 2 – Smetana: String Quartet No. 1 "From My Life"
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      date published: 2026-07-08T03:53:27Z
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  track: String Quartet No. 13 in G Major, Op. 106: II. Adagio ma non troppo
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album: Ravel, Dutilleux & Hough: String Quartets
album: Schubert: String Quartets D. 112 & 887
album: Takacs Assad Labro
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album: Felix & Fanny Mendelssohn: String Quartets
album: Elgar & Beach: Piano Quintets
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album: Schubert: String Quartets Nos. 8 and 10
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album: Mozart: 6 String Quartets Nos. 14-19, "Haydn Quartets"
album: Bartok: Complete String Quartets
album: Brahms: String Quintets Nos. 1 & 2
album: Britten: String Quartets Nos. 1, 2 & 3
album: Schumann: String Quartets Nos. 1 & 2, Op. 41
album: Schubert: String Quintet in C Major, D. 956; Quartettsatz, D. 703
album: Haydn: String Quartets, Op. 74 "Apponyi Quartets"
album: Haydn: String Quartets, Op. 71 Nos. 1-3
album: Schumann: Piano Quintet; String Quartet No. 3
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album: Brahms: Piano Quintet; String Quartet No. 2
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album: Beethoven: The Early Quartets
album: Beethoven: String Quartets Vol.3
album: Beethoven: The Middle Quartets
album: Schubert: String Quartet in G Major / Piano Trio in E-Flat Major "Notturno"
album: Dvorák: Piano Quintet in A/String Quartet No.10
album: Schubert: Trout Quintet / Wolf: Italian Serenade / Mozart: Eine kleine Nachtmusik
album: Schubert: String Quartet No. 15; Piano Trio in E flat major "Notturno"
album: Bartók: The String Quartets
album: Borodin/Smetana: String Quartet No.2/String Quartet No.1 "From My Life"

String Quartet No. 15 in A Minor, Op. 132: 3. Molto adagio
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audio: String Quartet No. 15 in A Minor, Op. 132: 3. Molto adagio
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String Quartet No. 14 in C-Sharp Minor, Op. 131: 1. Adagio ma non troppo e molto espressivo
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String Quartet No. 14 in C-Sharp Minor, Op. 131: 2. Allegro molto vivace
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  date published: 2026-07-02T03:55:08Z
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String Quartet No. 14 in C-Sharp Minor, Op. 131: 3. Allegro moderato
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by artist: Takács Quartet
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additional property: OTSVerifyInstructions
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  date published: 2026-07-02T03:55:08Z
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String Quartet No. 14 in C-Sharp Minor, Op. 131: 6. Adagio quasi un poco andante
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additional property: OTSVerifyInstructions
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  date published: 2026-06-13T15:41:10Z
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String Quartet No. 14 in C-Sharp Minor, Op. 131: 5. Presto
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  date published: 2026-07-22T14:53:14Z
audio: String Quartet No. 14 in C-Sharp Minor, Op. 131: 5. Presto
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String Quartet No. 14 in C-Sharp Minor, Op. 131: 7. Allegro
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  date published: 2026-07-22T15:38:35Z
audio: String Quartet No. 14 in C-Sharp Minor, Op. 131: 7. Allegro
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Piano Quintet in A major, D. 667 "The Trout": 3. Scherzo (Presto)
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by artist: Franz Schubert
by artist: Takács Quartet
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by artist: Andreas Haefliger
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additional property: OTSVerifyInstructions
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  date published: 2026-06-13T15:41:10Z
audio: Piano Quintet in A major, D. 667 "The Trout": 3. Scherzo (Presto)
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String Quartet No. 2 in D: 3. Notturno
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by artist: Takács Quartet
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  date published: 2026-07-02T03:55:08Z
audio: String Quartet No. 2 in D: 3. Notturno
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String Quartet No. 1 in E minor "From my Life": 3. Largo sostenuto
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  date published: 2026-07-22T20:03:16Z
audio: String Quartet No. 1 in E minor "From my Life": 3. Largo sostenuto
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String Quartet No. 13 in G Major, Op. 106: III. Molto Vivace
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Ravel, Dutilleux & Hough: String Quartets
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Schubert: String Quartets D. 112 & 887
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Takacs Assad Labro
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Haydn: String Quartets, Op. 42, 77 & 103
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Felix & Fanny Mendelssohn: String Quartets
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Dvořák: String Quartet, Op. 105; String Quintet, Op. 97 "American"
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track: String Quartet No. 2 in G Major, Op. 18 No. 2: 4. Allegro molto, quasi presto
track: String Quartet No. 3 in D Major, Op. 18 No. 3: 2. Andante con moto
track: String Quartet No. 4 in C Minor, Op. 18 No. 4: 1. Allegro ma non tanto
track: String Quartet No. 4 in C Minor, Op. 18 No. 4: 2. Andante scherzoso, quasi allegretto
track: String Quartet No. 4 in C Minor, Op. 18 No. 4: 3. Menuetto. Allegretto
track: String Quartet No. 5 in A Major, Op. 18 No. 5: 4. Allegro
track: String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 2. Allegretto vivace e sempre scherzando
track: String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 3. Adagio molto e mesto
track: String Quartet No. 8 in E Minor, Op. 59 No. 2 "Rasumovsky No. 2": 3. Allegretto
track: String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 1. Introduzione. Andante con moto - Allegro vivace
track: String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 3. Menuetto. Grazioso
track: String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 4. Allegro molto
track: String Quartet No. 11 in F Minor, Op. 95 "Serioso": 1. Allegro con brio
track: String Quartet No. 11 in F Minor, Op. 95 "Serioso": 4. Larghetto espressivo - Allegretto agitato

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String Quartet No. 2 in G Major, Op. 18 No. 2: 4. Allegro molto, quasi presto
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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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String Quartet No. 3 in D Major, Op. 18 No. 3: 2. Andante con moto
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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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String Quartet No. 4 in C Minor, Op. 18 No. 4: 1. Allegro ma non tanto
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subject of: OpenTimestamps Proof of Existence
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String Quartet No. 4 in C Minor, Op. 18 No. 4: 2. Andante scherzoso, quasi allegretto
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  date published: 2026-07-08T03:53:27Z
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String Quartet No. 4 in C Minor, Op. 18 No. 4: 3. Menuetto. Allegretto
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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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String Quartet No. 5 in A Major, Op. 18 No. 5: 4. Allegro
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String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 2. Allegretto vivace e sempre scherzando
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String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 3. Adagio molto e mesto
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-07T11:43:09Z
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String Quartet No. 8 in E Minor, Op. 59 No. 2 "Rasumovsky No. 2": 3. Allegretto
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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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String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 1. Introduzione. Andante con moto - Allegro vivace
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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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String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 3. Menuetto. Grazioso
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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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String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 4. Allegro molto
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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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String Quartet No. 11 in F Minor, Op. 95 "Serioso": 1. Allegro con brio
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  date published: 2026-07-08T03:22:41Z
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String Quartet No. 11 in F Minor, Op. 95 "Serioso": 4. Larghetto espressivo - Allegretto agitato
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  date published: 2026-07-08T03:22:41Z
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Mozart: String Quintets Nos. 5 & 6
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F. Schubert: Piano Quintet in A Major "Trout" Quintet, R. Schumann: 3 String Quartets Op. 41
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OpenTimestamps Proof of Existence
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track: String Quartet In D Minor, Hob. III:76 (Op. 76 No. 2 - "Fifths"): 2. Andante o più tosto allegretto
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track: String Quartet In C Major, Op. 76 No. 3, Hob. lll:77 "Emperor"): 1. Allegro
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String Quartet in D major, Hob.III:79, Op. 76, No. 5: 2. Largo
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String Quartet In D Minor, Hob. III:76 (Op. 76 No. 2 - "Fifths"): 4. Finale (Vivace assai)
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String Quartet In C Major, Op. 76 No. 3, Hob. lll:77 "Emperor"): 2. Poco adagio, cantabile
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Beethoven: The Early Quartets
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track: String Quartet No. 15 in A Minor, Op. 132: 3. Molto adagio
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track: String Quartet No. 14 in C-Sharp Minor, Op. 131: 1. Adagio ma non troppo e molto espressivo
track: String Quartet No. 14 in C-Sharp Minor, Op. 131: 2. Allegro molto vivace
track: String Quartet No. 14 in C-Sharp Minor, Op. 131: 3. Allegro moderato
track: String Quartet No. 16 in F Major, Op. 135: 2. Vivace
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  audio: String Quartet No. 16 in F Major, Op. 135: 2. Vivace
track: String Quartet No. 13 in B-Flat Major, Op. 130: 3. Andante con moto ma non troppo. Poco scherzando
track: String Quartet No. 16 in F Major, Op. 135: 3. Lento assai, cantante e tranquillo
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track: Grosse Fuge in B-Flat Major, Op. 133
track: String Quartet No. 14 in C-Sharp Minor, Op. 131: 5. Presto
track: String Quartet No. 14 in C-Sharp Minor, Op. 131: 7. Allegro

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value: https://explorer.copyrightchains.com/tx/0x413f4481442ad09169e9d2e78521a0ee23d186541fa3528fadcda15e54c48541

OTSHash
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OTSBitcoinBlock
type: PropertyValue
value: 957118

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

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401042

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

OTSVerifyInstructions
type: PropertyValue
value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413f4481442ad09169e9d2e78521a0ee23d186541fa3528fadcda15e54c48541. 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/GBBBA0401042.
date published: 2026-07-08T03:20:19Z

String Quartet No. 16 in F Major, Op. 135: 2. Vivace
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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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  value: 0.004
additional property: Liveness
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additional property: Valence (Positivity)
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additional property: Loudness (dB)
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additional property: Key Name
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additional property: Mode Name
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String Quartet No. 13 in B-Flat Major, Op. 130: 3. Andante con moto ma non troppo. Poco scherzando
type: MusicRecording
duration: PT6M26S
duration ms: 386320
explicit: false
by artist: Ludwig van Beethoven
by artist: Takács Quartet
in album: Beethoven: String Quartets Vol.3
  type: MusicAlbum
  date published: 2004-01-01
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: GBBBA0401063
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xc03d415c41d3169d074490589f13595fea79cdb4efc22561261f31bd6cfe83b7
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/GBBBA0401063
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 0xc03d415c41d3169d074490589f13595fea79cdb4efc22561261f31bd6cfe83b7. 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/GBBBA0401063.
  date published: 2026-07-08T03:20:19Z
audio: String Quartet No. 13 in B-Flat Major, Op. 130: 3. Andante con moto ma non troppo. Poco scherzando
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String Quartet No. 16 in F Major, Op. 135: 3. Lento assai, cantante e tranquillo
type: MusicRecording
duration: PT7M49S
duration ms: 469853
explicit: false
by artist: Ludwig van Beethoven
by artist: Takács Quartet
in album: Beethoven: String Quartets Vol.3
  type: MusicAlbum
  date published: 2004-01-01
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: GBBBA0401043
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T07:25:01+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf2a3a33f624ccc64d576a2baad02cae5401bc415c971ee955b1e8cbdc1e87a49
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/GBBBA0401043
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-07T11:02:43Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a3a33f624ccc64d576a2baad02cae5401bc415c971ee955b1e8cbdc1e87a49. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401043.
  date published: 2026-07-07T11:02:43Z
audio: String Quartet No. 16 in F Major, Op. 135: 3. Lento assai, cantante e tranquillo
  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: 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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  additional property: Mode Name
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String Quartet No. 13 in B-Flat Major, Op. 130: 5. Cavatina. Adagio molto espressivo
type: MusicRecording
duration: PT8M17S
duration ms: 497413
explicit: false
by artist: Ludwig van Beethoven
by artist: Takács Quartet
in album: Beethoven: String Quartets Vol.3
  type: MusicAlbum
  date published: 2004-01-01
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: GBBBA0401065
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T23:32:07+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/GBBBA0401065
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 0xb514f105e889d46163eab543f8c4a449337bc157a428cb45db3e33450f9e8ae6. 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/GBBBA0401065.
  date published: 2026-07-08T03:20:19Z
audio: String Quartet No. 13 in B-Flat Major, Op. 130: 5. Cavatina. Adagio molto espressivo
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  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Grosse Fuge in B-Flat Major, Op. 133
type: MusicRecording
duration: PT14M28S
duration ms: 868066
explicit: false
by artist: Ludwig van Beethoven
by artist: Takács Quartet
in album: Beethoven: String Quartets Vol.3
  type: MusicAlbum
  date published: 2004-01-01
genre: classical
genre: classical-piano
genre: chamber-music
isrc code: GBBBA0401080
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T07:19:02+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x5a578511784bed3a578f32b8b8c4813d3f03fa1cec0f703288792ac5b7d24bf0
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957073
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401080
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 0x5a578511784bed3a578f32b8b8c4813d3f03fa1cec0f703288792ac5b7d24bf0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-21T17:26:51Z), 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/GBBBA0401080.
  date published: 2026-07-21T17:26:51Z
audio: Grosse Fuge in B-Flat Major, Op. 133
  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
    type: PropertyValue
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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  additional property: Key Name
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  additional property: Mode Name
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Beethoven: The Middle Quartets
type: MusicAlbum
date published: 2002-01-01
track: String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 2. Allegretto vivace e sempre scherzando
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  duration: PT8M18S
  duration ms: 498439
  explicit: false
  by artist: Ludwig van Beethoven
  by artist: Takács Quartet
  in album: Beethoven: The Middle Quartets
    type: MusicAlbum
    date published: 2002-01-01
  genre: classical
  genre: classical-piano
  genre: chamber-music
  isrc code: GBBBB0107002
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
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  additional property: CopyrightRegisteredAt
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    value: 2026-07-06T20:16:36+00:00
  additional property: CopyrightChainExplorerURL
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  additional property: OTSHash
  additional property: OTSBitcoinBlock
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  additional property: OTSBitcoinBlockVerifyURL
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  additional property: OTSVerificationAPI
    type: PropertyValue
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  additional property: OTSTimestamp
    type: PropertyValue
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  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070113dc772276de9f3da18f825a347d6524bc0c80f6221e7f565b4a6d6d8256. 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/GBBBB0107002.
    date published: 2026-07-08T03:22:41Z
  audio: String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 2. Allegretto vivace e sempre scherzando
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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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: Valence (Positivity)
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    additional property: Loudness (dB)
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    additional property: Key Name
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    additional property: Mode Name
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track: String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 3. Adagio molto e mesto
  type: MusicRecording
  duration: PT13M20S
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  explicit: false
  by artist: Ludwig van Beethoven
  by artist: Takács Quartet
  in album: Beethoven: The Middle Quartets
    type: MusicAlbum
    date published: 2002-01-01
  genre: classical
  genre: classical-piano
  genre: chamber-music
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  additional property: CopyrightID
  additional property: CopyrightStatus
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  additional property: CopyrightRegisteredAt
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  additional property: OTSVerificationAPI
    type: PropertyValue
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  additional property: OTSTimestamp
    type: PropertyValue
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  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1f721e7ab536459b9a73f7adaa387c9bad63b0e5f30472035015a60688d8ec. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBB0107003.
    date published: 2026-06-13T15:41:10Z
  audio: String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 3. Adagio molto e mesto
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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: Key Name
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    additional property: Mode Name
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track: String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 1. Introduzione. Andante con moto - Allegro vivace
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OpenTimestamps Proof of Existence
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date published: 2026-07-08T08:56:20Z

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    date published: 2026-07-08T03:22:41Z
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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: Piano Quintet in A major, D. 667 "The Trout": 3. Scherzo (Presto)
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-21T17:00:35Z
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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: 2026-07-08T03:20:19Z

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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
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d3d36700c141e066dfff959890999b92a22e469f506da2025a6398896f5a0a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079611361.
    date published: 2026-07-06T06:56:49Z
  audio: String Quartet No. 1, BB 52, Op. 7 (Sz.40): 1. Lento
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 86.897
    additional property: Musical Key
      type: PropertyValue
      value: 7
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.192
    additional property: Energy
      type: PropertyValue
      value: 0.091
    additional property: Speechiness
      type: PropertyValue
      value: 0.042
    additional property: Acousticness
      type: PropertyValue
      value: 0.86
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.898
    additional property: Liveness
      type: PropertyValue
      value: 0.081
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.032
    additional property: Loudness (dB)
      type: PropertyValue
      value: -20.447
    additional property: Key Name
      type: PropertyValue
      value: G
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: String Quartet No. 2, BB 75, Op. 17 (Sz.67): 1. Moderato
  type: MusicRecording
  duration: PT9M41S
  duration ms: 581000
  explicit: false
  by artist: Béla Bartók
  by artist: Takács Quartet
  in album: Bartók: The String Quartets
    type: MusicAlbum
    date published: 1997-01-01
  isrc code: GBF079611371
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-06T18:31:43+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x9efcae584a20d084fe1fbf1c97d8155464071530fa3d117657f575e888405cab
  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/GBF079611371
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-22T01:25:27Z
  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 0x9efcae584a20d084fe1fbf1c97d8155464071530fa3d117657f575e888405cab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T01:25:27Z), 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/GBF079611371.
    date published: 2026-07-22T01:25:27Z
  audio: String Quartet No. 2, BB 75, Op. 17 (Sz.67): 1. Moderato
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 107.484
    additional property: Musical Key
      type: PropertyValue
      value: 0
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.145
    additional property: Energy
      type: PropertyValue
      value: 0.16
    additional property: Speechiness
      type: PropertyValue
      value: 0.047
    additional property: Acousticness
      type: PropertyValue
      value: 0.91
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.766
    additional property: Liveness
      type: PropertyValue
      value: 0.083
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.037
    additional property: Loudness (dB)
      type: PropertyValue
      value: -21.37
    additional property: Key Name
      type: PropertyValue
      value: C
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: String Quartet No. 2, BB 75, Op. 17 (Sz.67): 3. Lento
  type: MusicRecording
  duration: PT8M45S
  duration ms: 525373
  explicit: false
  by artist: Béla Bartók
  by artist: Takács Quartet
  in album: Bartók: The String Quartets
    type: MusicAlbum
    date published: 1997-01-01
  isrc code: GBF079611373
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-07T00:30:34+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x0a89e64b7165586798d0fb506d83b5f5ef09d9c9925f19b851725bfce0df5235
  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
  additional property: OTSTimestamp
  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: String Quartet No. 2, BB 75, Op. 17 (Sz.67): 3. Lento
track: String Quartet No. 3, BB 93 (Sz.85): 1. Prima parte (Moderato)
track: String Quartet No. 4, BB 95 (Sz.91): 1. Allegro
track: String Quartet No. 3, BB 93 (Sz.85): 3. Ricapitolazione della prima parte (Moderato)
track: String Quartet No. 4, BB 95 (Sz.91): 3. Non troppo lento
track: String Quartet No. 5, BB 110 (Sz.102): 1. Allegro
track: String Quartet No. 6, BB 119 (Sz.114): 3. Mesto - Burletta (Moderato)

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079611373

OTSTimestamp
type: PropertyValue
value: 2026-07-08T03:22:41Z

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 0x0a89e64b7165586798d0fb506d83b5f5ef09d9c9925f19b851725bfce0df5235. 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/GBF079611373.
date published: 2026-07-08T03:22:41Z

String Quartet No. 2, BB 75, Op. 17 (Sz.67): 3. Lento
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 106.131
additional property: Musical Key
  type: PropertyValue
  value: 9
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 0
additional property: Time Signature
  type: PropertyValue
  value: 5
additional property: Danceability
  type: PropertyValue
  value: 0.086
additional property: Energy
  type: PropertyValue
  value: 0.055
additional property: Speechiness
  type: PropertyValue
  value: 0.044
additional property: Acousticness
  type: PropertyValue
  value: 0.897
additional property: Instrumentalness
  type: PropertyValue
  value: 0.583
additional property: Liveness
  type: PropertyValue
  value: 0.201
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.031
additional property: Loudness (dB)
  type: PropertyValue
  value: -24.461
additional property: Key Name
  type: PropertyValue
  value: A
additional property: Mode Name
  type: PropertyValue
  value: Minor

String Quartet No. 3, BB 93 (Sz.85): 1. Prima parte (Moderato)
type: MusicRecording
duration: PT4M50S
duration ms: 290840
explicit: false
by artist: Béla Bartók
by artist: Takács Quartet
in album: Bartók: The String Quartets
  type: MusicAlbum
  date published: 1997-01-01
isrc code: GBF079611381
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T20:55:32+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3b53c79755ab5ea49d189774b83a5a7f06421de8dae71c2a1615ccb3d6cf0d86
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/GBF079611381
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 0x3b53c79755ab5ea49d189774b83a5a7f06421de8dae71c2a1615ccb3d6cf0d86. 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/GBF079611381.
  date published: 2026-07-08T03:20:19Z
audio: String Quartet No. 3, BB 93 (Sz.85): 1. Prima parte (Moderato)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 147.906
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.19
  additional property: Energy
    type: PropertyValue
    value: 0.075
  additional property: Speechiness
    type: PropertyValue
    value: 0.042
  additional property: Acousticness
    type: PropertyValue
    value: 0.903
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.483
  additional property: Liveness
    type: PropertyValue
    value: 0.118
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.036
  additional property: Loudness (dB)
    type: PropertyValue
    value: -22.508
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major

String Quartet No. 4, BB 95 (Sz.91): 1. Allegro
type: MusicRecording
duration: PT5M56S
duration ms: 356360
explicit: false
by artist: Béla Bartók
by artist: Takács Quartet
in album: Bartók: The String Quartets
  type: MusicAlbum
  date published: 1997-01-01
isrc code: GBF079611391
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T18:10:18+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x44f9a522f61274785a3c0fa71ae0f3892a538f2e1cc98e8b1c256813244fe958
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 958042
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/958042
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079611391
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-14T18:24:07Z
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 0x44f9a522f61274785a3c0fa71ae0f3892a538f2e1cc98e8b1c256813244fe958. Chain 2 (Bitcoin): anchored in block 958042 (2026-07-14T18:24:07Z), 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/GBF079611391.
  date published: 2026-07-14T18:24:07Z
audio: String Quartet No. 4, BB 95 (Sz.91): 1. Allegro
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 127.692
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.386
  additional property: Energy
    type: PropertyValue
    value: 0.179
  additional property: Speechiness
    type: PropertyValue
    value: 0.047
  additional property: Acousticness
    type: PropertyValue
    value: 0.958
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.776
  additional property: Liveness
    type: PropertyValue
    value: 0.17
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.188
  additional property: Loudness (dB)
    type: PropertyValue
    value: -19.758
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Minor

String Quartet No. 3, BB 93 (Sz.85): 3. Ricapitolazione della prima parte (Moderato)
type: MusicRecording
duration: PT4M56S
duration ms: 296506
explicit: false
by artist: Béla Bartók
by artist: Takács Quartet
in album: Bartók: The String Quartets
  type: MusicAlbum
  date published: 1997-01-01
isrc code: GBF079611383
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T09:58:44+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2c8533dc834b95a9ae08efa139b9ce3968c0625ffac35813a43a925d8c2c00bd
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957026
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957026
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079611383
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-07T11:02:43Z
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8533dc834b95a9ae08efa139b9ce3968c0625ffac35813a43a925d8c2c00bd. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079611383.
  date published: 2026-07-07T11:02:43Z
audio: String Quartet No. 3, BB 93 (Sz.85): 3. Ricapitolazione della prima parte (Moderato)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 126.975
  additional property: Musical Key
    type: PropertyValue
    value: 9
  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: 0.1
  additional property: Speechiness
    type: PropertyValue
    value: 0.041
  additional property: Acousticness
    type: PropertyValue
    value: 0.924
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.624
  additional property: Liveness
    type: PropertyValue
    value: 0.078
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.048
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.462
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Minor

String Quartet No. 4, BB 95 (Sz.91): 3. Non troppo lento
type: MusicRecording
duration: PT5M27S
duration ms: 327000
explicit: false
by artist: Béla Bartók
by artist: Takács Quartet
in album: Bartók: The String Quartets
  type: MusicAlbum
  date published: 1997-01-01
isrc code: GBF079611393
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T20:43:52+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x41e7c80764827b02f1dcba2fc6fc2149e5e473e6e25ca5c87fae2422abce9945
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/GBF079611393
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 0x41e7c80764827b02f1dcba2fc6fc2149e5e473e6e25ca5c87fae2422abce9945. 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/GBF079611393.
  date published: 2026-07-08T03:20:19Z
audio: String Quartet No. 4, BB 95 (Sz.91): 3. Non troppo lento
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 100.108
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.163
  additional property: Energy
    type: PropertyValue
    value: 0.037
  additional property: Speechiness
    type: PropertyValue
    value: 0.049
  additional property: Acousticness
    type: PropertyValue
    value: 0.931
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.815
  additional property: Liveness
    type: PropertyValue
    value: 0.212
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.039
  additional property: Loudness (dB)
    type: PropertyValue
    value: -28.03
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

String Quartet No. 5, BB 110 (Sz.102): 1. Allegro
type: MusicRecording
duration: PT7M28S
duration ms: 448626
explicit: false
by artist: Béla Bartók
by artist: Takács Quartet
in album: Bartók: The String Quartets
  type: MusicAlbum
  date published: 1997-01-01
isrc code: GBF079611401
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T09:15:37+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0096b460fba1bddd802d706ebc234ba26e100793d313ba3c134d7697a438c2c4
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957048
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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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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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0096b460fba1bddd802d706ebc234ba26e100793d313ba3c134d7697a438c2c4. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/GBF079611401.
  date published: 2026-07-07T14:18:56Z
audio: String Quartet No. 5, BB 110 (Sz.102): 1. Allegro
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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: Key Name
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String Quartet No. 6, BB 119 (Sz.114): 3. Mesto - Burletta (Moderato)
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duration: PT7M20S
duration ms: 440000
explicit: false
by artist: Béla Bartók
by artist: Takács Quartet
in album: Bartók: The String Quartets
  type: MusicAlbum
  date published: 1997-01-01
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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/GBF079611413
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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939f01a5d19db4092a0ed5b6caeeb6daa961b08b7e67527bf6beeb621d44a122. 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/GBF079611413.
  date published: 2026-07-08T03:22:41Z
audio: String Quartet No. 6, BB 119 (Sz.114): 3. Mesto - Burletta (Moderato)
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
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  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
    type: PropertyValue
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
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  additional property: Instrumentalness
    type: PropertyValue
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  additional property: Liveness
    type: PropertyValue
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Borodin/Smetana: String Quartet No.2/String Quartet No.1 "From My Life"
type: MusicAlbum
date published: 1996-01-01
track: String Quartet No. 1 in E minor "From my Life": 2. Allegro moderato alla Polka
  type: MusicRecording
  duration: PT5M18S
  duration ms: 318826
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  by artist: Bedřich Smetana
  by artist: Takács Quartet
  in album: Borodin/Smetana: String Quartet No.2/String Quartet No.1 "From My Life"
    type: MusicAlbum
    date published: 1996-01-01
  genre: classical
  genre: late-romantic-era
  genre: czech-classical
  genre: early-modern-classical
  isrc code: GBF079510402
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
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  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-07T08:08:54+00:00
  additional property: CopyrightChainExplorerURL
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    value: https://explorer.copyrightchains.com/tx/0x727d5b1b3a4a975a99f842b897d78b2337efa7a557e20245e17820a0d78e6ca5
  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/GBF079510402
  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 0x727d5b1b3a4a975a99f842b897d78b2337efa7a557e20245e17820a0d78e6ca5. 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/GBF079510402.
    date published: 2026-07-08T03:20:19Z
  audio: String Quartet No. 1 in E minor "From my Life": 2. Allegro moderato alla Polka
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
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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
      value: 0.423
    additional property: Energy
      type: PropertyValue
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    additional property: Speechiness
      type: PropertyValue
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    additional property: Acousticness
      type: PropertyValue
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    additional property: Instrumentalness
      type: PropertyValue
      value: 0.082
    additional property: Liveness
      type: PropertyValue
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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    additional property: Key Name
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    additional property: Mode Name
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track: String Quartet No. 2 in D: 3. Notturno
track: String Quartet No. 2 in D: 4. Finale
  type: MusicRecording
  duration: PT6M52S
  duration ms: 412493
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  by artist: Alexander Borodin
  by artist: Takács Quartet
  in album: Borodin/Smetana: String Quartet No.2/String Quartet No.1 "From My Life"
    type: MusicAlbum
    date published: 1996-01-01
  genre: classical
  genre: late-romantic-era
  genre: early-modern-classical
  genre: russian-romanticism
  isrc code: GBF079510414
  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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    value: https://explorer.copyrightchains.com/tx/0x27cfba24f4926978ebdc5887afed342172e7592e6b6caf85caf668127afb6a5a
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  additional property: OTSBitcoinBlock
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  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957118
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079510414
  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 0x27cfba24f4926978ebdc5887afed342172e7592e6b6caf85caf668127afb6a5a. 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/GBF079510414.
    date published: 2026-07-08T03:20:19Z
  audio: String Quartet No. 2 in D: 4. Finale
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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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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    additional property: Mode Name
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track: String Quartet No. 1 in E minor "From my Life": 3. Largo sostenuto