Tanja Tetzlaff (born 1973) is a German cellist. She played first as an orchestra member, but then as a soloist, a founding member of the Tetzlaff Quartet, a string quartet led by her brother Christian
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 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. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c09f744767ecd71b15aeb451c571ab5230d0edc5bd6a97241eca2609e29e48. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14658bc2-4b6f-4705-89ba-4a89261ef0e3.json and https://artists.proofprofile.net/proofs/artist/14658bc2-4b6f-4705-89ba-4a89261ef0e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lars Vogt & Friends Live in Heimbach, Vol. 1: Haydn, Mozart, Brahms, Schumann & Berg
Lars Vogt & Friends Live in Heimbach, Vol. 2
Tchaikovsky & Borodin: String Quartets No. 2
Dvořák: Dumky & Zypressen: Shostakovich: Piano Trio No. 1 (Live)
Tchaikovsky: String Quartet No. 3 in E-Flat Minor, Op. 30, TH 113 / Shostakovich: Piano Trio No. 2 in E Minor, Op. 67 (Live)
Smetana, Ravel & Watkins: Piano Trios (Live)
Felix Mendelssohn & George Enescu: Octets for Strings (Live)
Octet in E-Flat Major, Op. 20, MWV R20: I. Allegro moderato, ma con fuoco - Live
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ead9a0491dd8f890841ebb97db39587a033938c803c476f3b96a67c1cccec6. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEAQ70900183.
Octet in E-Flat Major, Op. 20, MWV R20: II. Andante - Live
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Octet in E-Flat Major, Op. 20, MWV R20: IV. Presto - Live
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Octet in C Major, Op. 7: I. Très modéré - Live
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Octet in C Major, Op. 7: II. Très fougueux - Live
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Octet in C Major, Op. 7: III. Lentement - Live
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Octet in C Major, Op. 7: IV. Mouvement de valse bien rythmée - Live
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Octet in E-Flat Major, Op. 20, MWV R20: III. Scherzo (Allegro leggierissimo) - Live
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Serenade - Works for Clarinet and Strings by Krenek, Gál and Penderecki
Serenade for Clarinet Quartet in B Major, Op. 4: II. Adagio ma non troppo
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Serenade for Clarinet Quartet in B Major, Op. 4: V. Allegretto grazioso
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Serenade for Clarinet, Violin and Cello, Op. 93: I. Cantabile. Moderato
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Serenade for Clarinet, Violin and Cello, Op. 93: II. Burletta. Vivace ma non troppo
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Serenade for Clarinet, Violin and Cello, Op. 93: III. Intermezzo. Andantino
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Serenade for Clarinet, Violin and Cello, Op. 93: IV. Giocoso. Allegro molto moderato
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Serenade for Clarinet Quartet in B Major, Op. 4: I. Moderato
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Serenade for Clarinet Quartet in B Major, Op. 4: III. Allegro molto
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Serenade for Clarinet Quartet in B Major, Op. 4: IV. Langsamer
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Serenade for Clarinet Quartet in B Major, Op. 4: VI. Allegro vivace
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Clarinet Quartet: III. Serenade. Tempo di Valse
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Brahms, Viotti & Dvořák: Orchestral Works
Double Concerto in A Minor, Op. 102: III. Vivace non troppo
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From the Bohemian Forest, Op. 68, B. 133: No. 5, Silent Woods
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Double Concerto in A Minor, Op. 102: I. Allegro
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Double Concerto in A Minor, Op. 102: II. Andante
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Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: I. Allegro
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Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: II. Andante con moto
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Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: IV. Rondo. Allegro vivace
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Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: IV. Allegro moderato
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Arpeggione Sonata in A Minor, D. 821: I. Allegro moderato
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Arpeggione Sonata in A Minor, D. 821: II. Adagio
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Arpeggione Sonata in A Minor, D. 821: III. Allegretto
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Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: I. Allegro moderato
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Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: II. Andante un poco mosso
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Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: III. Scherzo. Allegro - Trio
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Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: III. Scherzando. Allegro moderato
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Piano Trio in E-Flat Major, Op. 148, D. 897 "Notturno"
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J.S. Bach: Cello Suites Nos. 4-6 / Encke: Cracks; Clouds
Piano Trio No. 3 in F Minor, Op. 65, B. 130: IV. Finale. Allegro con brio
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: II. Poco adagio - Vivace non troppo
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: V. Allegro - Meno mosso
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Piano Trio No. 3 in F Minor, Op. 65, B. 130: I. Allegro ma non troppo
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Piano Trio No. 3 in F Minor, Op. 65, B. 130: II. Allegretto grazioso
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Piano Trio No. 3 in F Minor, Op. 65, B. 130: III. Poco adagio - Meno mosso
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: I. Lento maestoso - Allegro quasi doppio movimento
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: III. Andante - Vivace non troppo
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: IV. Andante moderato - Allegretto scherzando
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: VI. Lento maestoso - Vivace
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Beethoven: Triple Concerto & Piano Concerto No. 3
Triple Concerto for Violin, Cello & Piano in C Major, Op. 56: II. Largo
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Piano Concerto No. 3 in C Minor, Op. 37: II. Largo
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Triple Concerto for Violin, Cello & Piano in C Major, Op. 56: I. Allegro
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Rachmaninoff: Piano Trio No. 2 in D Minor, Op. 9 "Trio élégiaque" (Live)
Piano Trio No. 2 in C Major, Op. 87: I. Allegro
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Piano Trio No. 1 in B Major, Op. 8 (Revised 1889 Version): II. Scherzo: Allegro molto
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Piano Trio No. 1 in B Major, Op. 8 (Revised 1889 Version): III. Adagio
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Piano Trio No. 1 in B Major, Op. 8 (Revised 1889 Version): IV. Allegro
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Piano Trio No. 1 in B Major, Op. 8 (Revised 1889 Version): I. Allegro con brio
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Piano Trio No. 2 in C Major, Op. 87: II. Andante con moto
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Piano Trio No. 3 in C Minor, Op. 101: I. Allegro energico
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Piano Trio No. 3 in C Minor, Op. 101: III. Andante grazioso
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C. Schumann: Piano Trio in G Minor, Op. 17 / Schubert: String Quartet No. 13 in A Minor, D. 804 "Rosamunde"; String Trio No. 1 in B-Flat Major, D. 471 (Live)
D'un soir triste (Arr. for Piano Trio) - Live
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D'un matin de printemps (Arr. for Piano Trio) - Live
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Rihm: Konzert in einem Satz - Toch: Cello Concerto
Haydn, Rossini & Schubert: Duo, Trio & Quartet
Bach: Contrapunctus XI & Beethoven: String Quartet Op. 132 & Cello Sonata Op. 5 No 1 (Live)
Schumann: Piano Trio No. 1 in D Minor, Op. 63: II. Lebhaft, doch nicht zu rasch
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Schumann: Piano Trio No. 1 in D Minor, Op. 63: III. Langsam, mit inniger Empfindung
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Schumann: Piano Trio No. 3 in G Minor, Op. 110: III. Rasch
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Schumann: Piano Trio No. 1 in D Minor, Op. 63: IV. Mit Feuer
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Schumann: Piano Trio No. 3 in G Minor, Op. 110: IV. Kräftig, mit Humor
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Schumann: Piano Trio No. 2 in F Major, Op. 80: I. Sehr lebhaft
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Schumann: Fantasiestücke, Op. 88: No. 1, Romanze
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Schumann: Piano Trio No. 2 in F Major, Op. 80: III. In mässiger Bewegung
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Schumann: Fantasiestücke, Op. 88: No. 3, Duett
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Schumann: Piano Trio No. 2 in F Major, Op. 80: IV. Nicht zu rasch
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 1, Nicht schnell
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 4, Innig
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Schumann: Piano Trio No. 1 in D Minor, Op. 63: I. Mit Energie und Leidenschaft
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Schumann: Piano Trio No. 3 in G Minor, Op. 110: I. Bewegt, doch nicht zu rasch
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Schumann: Piano Trio No. 3 in G Minor, Op. 110: II. Ziemlich langsam
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Schumann: Piano Trio No. 2 in F Major, Op. 80: II. Mit innigem Ausdruck - Lebhaft
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Schumann: Fantasiestücke, Op. 88: No. 2, Humoreske
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 2, Mit innigem Ausdruck
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 3, Andantino
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 5, Nicht zu schnell
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 6, Adagio
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Johann Sebastian Bach: Brandenburg Concerto No. 6 - Viola da Gamba Sonata - Trio Sonata - Violin Sonata in F Minor (Live)
Malinconia: Works for Cello & Piano: Sibelius & Grieg & Rachmaninov
Schubert: Piano Trio No. 1 in B-Flat Major, D. 898; Introduction and Variations, D. 802 (Live)
Schubert: Piano Trio No. 2 in E-Flat Major, D. 929
Piano Trio No. 2 in E-Flat Major, D. 929: I. Allegro
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Piano Trio No. 2 in E-Flat Major, D. 929: II. Andante con moto
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Piano Trio No. 2 in E-Flat Major, D. 929: III. Allegro moderato
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Piano Trio No. 2 in E-Flat Major, D. 929: III. Allegro moderato [uncut manuscript version]
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Gál: Serenade for Clarinet, Violin and Cello, Op. 93: III. Intermezzo. Andantino
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Weber, Sains-Saëns, Klughardt & Krein: Chamber Music
12 Romances, Op. 21: VII. Zdes' khorosho
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Schubert: Schwanengesang & String Quintet
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String Quintet in C Major, D. 956: III. Scherzo. Presto - Trio. Andante sostenuto
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Schwanengesang, D. 957: No. 3, Frühlingssehnsucht
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String Quintet in C Major, D. 956: IV. Allegretto - Più allegro
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Schwanengesang, D. 957: No. 1, Liebesbotschaft
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Schwanengesang, D. 957: No. 8, Der Atlas
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String Quintet in C Major, D. 956: I. Allegro ma non troppo
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String Quintet in C Major, D. 956: II. Adagio
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Piano Quartet No. 3 in C Minor, Op. 60: I. Allegro ma non troppo
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Piano Quartet No. 3 in C Minor, Op. 60: II. Scherzo. Allegro
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Piano Quartet No. 2 in A Major, Op. 26: I. Allegro non troppo
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Piano Quartet No. 2 in A Major, Op. 26: II. Poco Adagio
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Piano Quartet No. 2 in A Major, Op. 26: III. Scherzo. Poco Allegro
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Piano Quartet No. 3 in C Minor, Op. 60: III. Andante
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Piano Quartet No. 2 in A Major, Op. 26: IV. Finale. Allegro
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Piano Quartet No. 3 in C Minor, Op. 60: IV. Allegro comodo
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Hot-Sonate: I. (M. M. = 66) - Arr. für Saxophon und Streichquartett
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Dreigroschenoper: Mackie Messer - Arr. für Saxophon, Streichquartett und Klavier
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Dreigroschenoper: Zuhälterballade - Arr. für Saxophon, Streichquartett und Klavier
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