Tetzlaff Quartet
type: MusicGroup
genre: chamber music
genre: classical
description: The Tetzlaff Quartet is a German string quartet ensemble formed in 1994. The quartet has released four CD recordings, of which their 2014 recording of Berg's Lyric Suite and the Mendelssohn Quartet Op
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album: Sibelius & Schoenberg: String Quartets
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  date published: 2010-10-01
album: Beethoven: String Quartets, Opp. 132, 130 & 133
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  track: String Quartet No. 15 in A Minor, Op. 132: I. Assai sostenuto - Allegro
  track: String Quartet No. 15 in A Minor, Op. 132: II. Allegro ma non tanto
  track: String Quartet No. 15 in A Minor, Op. 132: III. Molto adagio
  track: String Quartet No. 15 in A Minor, Op. 132: V. Allegro appassionato
  track: Große Fuge in B-Flat Major, Op. 133
  track: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): I. Adagio ma non troppo
  track: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): II. Presto
  track: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): III. Andante con moto ma non troppo
  track: String Quartet No. 15 in A Minor, Op. 132: IV. Alla marcia, assai vivace
  track: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): IV. Alla danza tedesca. Allegro assai
  track: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): V. Cavatina. Adagio molto espressivo
album: Schubert: String Quartet No. 15 - Haydn: String Quartet No. 26
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album: Mendelssohn: String Quartet in a Minor, Op. 13 / Berg: Lyric Suite
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  track: String Quartet No. 2 in A Minor, Op. 13, MWV R22: III. Intermezzo - Allegretto con moto - Allegro di molto
  track: String Quartet No. 2 in A Minor, Op. 13, MWV R22: IV. Presto - Adagio non lento

String Quartet No. 15 in A Minor, Op. 132: I. Assai sostenuto - Allegro
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String Quartet No. 15 in A Minor, Op. 132: II. Allegro ma non tanto
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String Quartet No. 15 in A Minor, Op. 132: III. Molto adagio
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String Quartet No. 15 in A Minor, Op. 132: V. Allegro appassionato
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Große Fuge in B-Flat Major, Op. 133
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String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): I. Adagio ma non troppo
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by artist: Tetzlaff Quartet
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genre: classical
genre: classical-piano
genre: chamber-music
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T21:51:49Z
audio: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): I. Adagio ma non troppo
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additional property: OTSVerifyInstructions
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String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): II. Presto
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duration: PT2M3S
duration ms: 123560
explicit: false
by artist: Ludwig van Beethoven
by artist: Tetzlaff Quartet
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  date published: 2020-04-03
genre: classical
genre: classical-piano
genre: chamber-music
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T01:32:48Z
audio: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): II. Presto
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additional property: OTSVerifyInstructions
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String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): III. Andante con moto ma non troppo
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duration: PT6M25S
duration ms: 385765
explicit: false
by artist: Ludwig van Beethoven
by artist: Tetzlaff Quartet
in album: Beethoven: String Quartets, Opp. 132, 130 & 133
  type: MusicAlbum
  date published: 2020-04-03
genre: classical
genre: classical-piano
genre: chamber-music
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f6151979216ec70ca21a7d6982440f6385b672691148cfe7cd0a4d75e89af1. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FINDE2000019.
  date published: 2026-07-29T22:48:59Z
audio: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): III. Andante con moto ma non troppo
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additional property: OTSVerifyInstructions
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String Quartet No. 15 in A Minor, Op. 132: IV. Alla marcia, assai vivace
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duration: PT2M9S
duration ms: 129252
explicit: false
by artist: Ludwig van Beethoven
by artist: Tetzlaff Quartet
in album: Beethoven: String Quartets, Opp. 132, 130 & 133
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  date published: 2020-04-03
genre: classical
genre: classical-piano
genre: chamber-music
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T15:22:21Z
audio: String Quartet No. 15 in A Minor, Op. 132: IV. Alla marcia, assai vivace
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additional property: OTSVerifyInstructions
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String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): IV. Alla danza tedesca. Allegro assai
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duration: PT2M54S
duration ms: 174142
explicit: false
by artist: Ludwig van Beethoven
by artist: Tetzlaff Quartet
in album: Beethoven: String Quartets, Opp. 132, 130 & 133
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genre: classical
genre: classical-piano
genre: chamber-music
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T14:44:50Z
audio: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): IV. Alla danza tedesca. Allegro assai
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): V. Cavatina. Adagio molto espressivo
type: MusicRecording
duration: PT5M31S
duration ms: 331459
explicit: false
by artist: Ludwig van Beethoven
by artist: Tetzlaff Quartet
in album: Beethoven: String Quartets, Opp. 132, 130 & 133
  type: MusicAlbum
  date published: 2020-04-03
genre: classical
genre: classical-piano
genre: chamber-music
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c60a9b463f5cb3e471cc336700636b9e24163111efdac6943918b511aa8b3e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE2000021.
  date published: 2026-07-29T14:28:24Z
audio: String Quartet No. 13 in B-Flat Major, Op. 130 (1825 Version): V. Cavatina. Adagio molto espressivo
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additional property: OTSVerifyInstructions
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String Quartet No. 2 in A Minor, Op. 13, MWV R22: I. Adagio - Allegro vivace
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duration: PT7M45S
duration ms: 465285
explicit: false
by artist: Felix Mendelssohn
by artist: Tetzlaff Quartet
in album: Mendelssohn: String Quartet in a Minor, Op. 13 / Berg: Lyric Suite
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genre: classical
genre: early-romantic-era
genre: german-romanticism
isrc code: DEAQ71426601
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additional property: OTSBitcoinBlock
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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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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