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
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee12d32e98ea14ded8bcc4adae2d914b7142d77234e26d46b37c6233c2c919e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd6232ed-71b7-440a-9625-930551bd370c.json and https://artists.proofprofile.net/proofs/artist/bd6232ed-71b7-440a-9625-930551bd370c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Selection of Schubert & Brahms: Takács Quartet
Janáček: String Quartets Nos. 1 & 2 – Smetana: String Quartet No. 1 "From My Life"
Dvořák: String Quartet, Op. 106; Coleridge-Taylor: Fantasiestücke
5 Fantasiestücke, Op. 5: No. 1, Prelude. Allegro ma non troppo
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbcc1a0448cf7b8bbee958fbdf3843a5b15f2306b637815a76bbc24d708a46b. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBAJY2341301.
5 Fantasiestücke, Op. 5: No. 2, Serenade. Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc317a99ddcf0f29401f00d34822b5d6861b62c88ee8e0f70de71d426be68b5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBAJY2341302.
5 Fantasiestücke, Op. 5: No. 3, Humoresque. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3460179043e5ea01a0c7d43e5fbe3e7b2de2e6e6df0dbc26ea5ee80ab8e19594. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/GBAJY2341303.
5 Fantasiestücke, Op. 5: No. 4, Minuet - Trio. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824a2860ee5663fec3c8dc7c75423dc35a7085bcb0544dc85eac967635dd60e2. 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/GBAJY2341304.
5 Fantasiestücke, Op. 5: No. 5, Dance. Vivace
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String Quartet No. 13 in G Major, Op. 106: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106234742a5215135bbaf75c262e2d8c20c0b1f4c3ed80235a362760cc7eb887. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBAJY2341306.
String Quartet No. 13 in G Major, Op. 106: II. Adagio ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7b9092b5116ad83eea7b76db8434e28bdb28231dd40b8eddf94cbd0196d140. 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/GBAJY2341307.
String Quartet No. 13 in G Major, Op. 106: III. Molto Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6dcbe1b0f98208023826abb95a7158cdd9570574a71a3f78607b856e6e2e43. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJY2341308.
Ravel, Dutilleux & Hough: String Quartets
String Quartet No. 1 "Les Six rencontres": I. Au boulevard
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String Quartet No. 1 "Les Six rencontres": II. Au parc
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a93f98b49ed0aeaf1ee38a5a4c103ee3c84b5a8fbaba886c0977552b400a4a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBAJY2240002.
Ainsi la nuit: I. Libre et souple – Nocturne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ec955bf701aa55279ffed0a61875ba78d4d773f11b429404b6dcdd9f974d13. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJY2240007.
Ainsi la nuit: II. Parenthèse I – Miroir d'espace
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String Quartet in F Major, M. 35: I. Allegro moderato, très doux
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String Quartet No. 15 in G Major, D. 887: I. Allegro molto moderato
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String Quartet No. 15 in G Major, D. 887: II. Andante un poco moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25783697fb2abc5829049f043036d36e45466daa1dc4d1f1ca26aa42b2b5a29. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBAJY2442302.
String Quartet No. 15 in G Major, D. 887: III. Scherzo. Allegro vivace – Trio. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5470de6042c702bcceca6c2996bdbfc752b393a9b3acfe6d55543a20e21645e0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBAJY2442303.
String Quartet No. 15 in G Major, D. 887: IV. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512b2f16937234e3f092ffd47b8b2fe4cdf87d1e115cff80f255cb70a87fe98b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBAJY2442304.
String Quartet No. 8 in B-Flat Major, D. 112: II. Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e0fb9213b862db2e23ad279290fc0037cc745d666387c8447a555b730ba5bd. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBAJY2442306.
String Quartet No. 8 in B-Flat Major, D. 112: III. Menuetto. Allegro
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045d4bda15cb233c1086a1d7b6920f9dd0df002b2c5c1a4de12123b445f6dd36. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USB8U2202639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483117d7379b449a7fe2066514f087db3a86019e12d1fe588a2163d101274628. 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/USB8U2202643.
Haydn: String Quartets, Op. 42, 77 & 103
String Quartet in D Minor, Op. 42: I. Andante ed innocentemente
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Felix & Fanny Mendelssohn: String Quartets
String Quartet in E-Flat Major, H-U 277: I. Adagio ma non troppo
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String Quartet in E-Flat Major, H-U 277: II. Allegretto
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String Quartet in E-Flat Major, H-U 277: III. Romanze
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String Quartet in E-Flat Major, H-U 277: IV. Allegro molto vivace
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String Quartet No. 6 in F Minor, Op. 80, MWV R37: I. Allegro vivace assai – Presto
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String Quartet No. 6 in F Minor, Op. 80, MWV R37: II. Allegro assai
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String Quartet No. 6 in F Minor, Op. 80, MWV R37: III. Adagio
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Piano Quintet in F-Sharp Minor, Op. 67: I. Adagio - Allegro moderato
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Piano Quintet in F-Sharp Minor, Op. 67: II. Adagio espressivo
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Piano Quintet in F-Sharp Minor, Op. 67: III. Allegro agitato - Adagio come prima - Presto
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Piano Quintet, Op. 84: I. Moderato – Allegro
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59479c0047456b47c66b4182f1c0008fb05b03ed0b8d9311844e6ea76a36d30c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBAJY2029505.
Piano Quintet, Op. 84: III. Andante – Allegro
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Dohnányi: Piano Quintets & String Quartet No. 2
Piano Quintet No. 1 in C Minor, Op. 1: I. Allegro
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Piano Quintet No. 1 in C Minor, Op. 1: II. Scherzo. Allegro vivace – Trio – Reprise
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Piano Quintet No. 1 in C Minor, Op. 1: III. Adagio, quasi andante
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String Quartet No. 2 in D-Flat Major, Op. 15: I. Andante – Allegro
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Dvořák: String Quartet, Op. 105; String Quintet, Op. 97 "American"
String Quartet No. 1 in F Major, Op. 18 No. 1: 1. Allegro con brio
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String Quartet No. 1 in F Major, Op. 18 No. 1: 2. Adagio affettuoso ed appassionato
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String Quartet No. 1 in F Major, Op. 18 No. 1: 3. Scherzo. Allegro molto
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String Quartet No. 1 in F Major, Op. 18 No. 1: 4. Allegro
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String Quartet No. 2 in G Major, Op. 18 No. 2: 1. Allegro
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String Quartet No. 2 in G Major, Op. 18 No. 2: 2. Adagio cantabile - Allegro - Tempo I
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String Quartet No. 2 in G Major, Op. 18 No. 2: 3. Scherzo. Allegro
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String Quartet No. 2 in G Major, Op. 18 No. 2: 4. Allegro molto, quasi presto
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String Quartet No. 3 in D Major, Op. 18 No. 3: 1. Allegro
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String Quartet No. 3 in D Major, Op. 18 No. 3: 2. Andante con moto
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String Quartet No. 3 in D Major, Op. 18 No. 3: 3. Allegro
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String Quartet No. 3 in D Major, Op. 18 No. 3: 4. Presto
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String Quartet No. 4 in C Minor, Op. 18 No. 4: 1. Allegro ma non tanto
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String Quartet No. 4 in C Minor, Op. 18 No. 4: 2. Andante scherzoso, quasi allegretto
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String Quartet No. 4 in C Minor, Op. 18 No. 4: 3. Menuetto. Allegretto
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String Quartet No. 4 in C Minor, Op. 18 No. 4: 4. Allegro
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String Quartet No. 5 in A Major, Op. 18 No. 5: 1. Allegro
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String Quartet No. 5 in A Major, Op. 18 No. 5: 2. Menuetto
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String Quartet No. 5 in A Major, Op. 18 No. 5: 3. Andante cantabile
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String Quartet No. 5 in A Major, Op. 18 No. 5: 4. Allegro
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String Quartet No. 6 in B-Flat Major, Op. 18 No. 6: 1. Allegro con brio
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String Quartet No. 6 in B-Flat Major, Op. 18 No. 6: 2. Adagio ma non troppo
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String Quartet No. 6 in B-Flat Major, Op. 18 No. 6: 3. Scherzo. Allegro
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String Quartet No. 6 in B-Flat Major, Op. 18 No. 6: 4. La Malinconia. Adagio - Allegretto quasi allegro - Adagio - Allegretto - Poco adagio - Prestissimo
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String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 1. 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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String Quartet No. 7 in F Major, Op. 59 No. 1 "Rasumovsky No. 1": 4. Thème russe. Allegro
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String Quartet No. 8 in E Minor, Op. 59 No. 2 "Rasumovsky No. 2": 1. Allegro
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String Quartet No. 8 in E Minor, Op. 59 No. 2 "Rasumovsky No. 2": 2. Molto adagio
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String Quartet No. 8 in E Minor, Op. 59 No. 2 "Rasumovsky No. 2": 3. Allegretto
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String Quartet No. 8 in E Minor, Op. 59 No. 2 "Rasumovsky No. 2": 4. Finale. Presto
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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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String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 2. Andante con moto quasi allegretto
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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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String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky No. 3": 4. Allegro molto
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String Quartet No. 10 in E-Flat Major, Op. 74 "Harp": 1. Poco adagio - Allegro
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String Quartet No. 10 in E-Flat Major, Op. 74 "Harp": 2. Adagio ma non troppo
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String Quartet No. 10 in E-Flat Major, Op. 74 "Harp": 3. Presto - Più presto quasi prestissimo
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String Quartet No. 10 in E-Flat Major, Op. 74 "Harp": 4. Allegretto con variazioni
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String Quartet No. 11 in F Minor, Op. 95 "Serioso": 1. Allegro con brio
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String Quartet No. 11 in F Minor, Op. 95 "Serioso": 2. Allegretto ma non troppo
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String Quartet No. 11 in F Minor, Op. 95 "Serioso": 3. Allegro assai vivace ma serioso
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String Quartet No. 11 in F Minor, Op. 95 "Serioso": 4. Larghetto espressivo - Allegretto agitato
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String Quartet No. 12 in E-Flat Major, Op. 127: 1. Maestoso - Allegro
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String Quartet No. 12 in E-Flat Major, Op. 127: 2. Adagio ma non troppo e molto cantabile
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String Quartet No. 12 in E-Flat Major, Op. 127: 3. Scherzando vivace
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String Quartet No. 12 in E-Flat Major, Op. 127: 4. Finale
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String Quartet No. 13 in B-Flat Major, Op. 130: 1. Adagio ma non troppo - Allegro
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String Quartet No. 13 in B-Flat Major, Op. 130: 2. Presto
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Franck: Piano Quintet – Debussy: String Quartet
Piano Quintet in F Minor, CFF 121: I. Molto moderato quasi lento – Allegro
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Piano Quintet in F Minor, CFF 121: II. Lento, con molto sentimento
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String Quartet in G Minor, CD 91: I. Animé et très décidé
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Shostakovich: Piano Quintet & String Quartet No. 2
F. Schubert: Piano Quintet in A Major "Trout" Quintet, R. Schumann: 3 String Quartets Op. 41
Mozart: 6 String Quartets Nos. 14-19, "Haydn Quartets"
String Quintet No. 1 in F Major, Op. 88: I. Allegro non troppo ma con brio
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String Quintet No. 2 in G Major, Op. 111: I. Allegro non troppo ma con brio
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String Quintet No. 2 in G Major, Op. 111: II. Adagio
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String Quintet No. 2 in G Major, Op. 111: IV. Vivace ma non troppo presto
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String Quartet No. 1 in D Major, Op. 25: I. Andante sostenuto – Allegro vivo
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String Quartet No. 1 in D Major, Op. 25: II. Allegretto con slancio
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String Quartet No. 1 in D Major, Op. 25: III. Andante calmo
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String Quartet No. 1 in D Major, Op. 25: IV. Molto vivace
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String Quartet No. 2 in C Major, Op. 36: I. Allegro calmo senza rigore
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String Quartet No. 2 in C Major, Op. 36: II. Vivace
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String Quartet No. 2 in C Major, Op. 36: III. Chacony. Sostenuto
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String Quartet No. 3, Op. 94: I. Duets. With Moderate Movement
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String Quartet No. 3, Op. 94: II. Ostinato. Very Fast
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String Quartet No. 3, Op. 94: III. Solo. Very Calm
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String Quartet No. 3, Op. 94: IV. Burlesque. Fast, con fuoco
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String Quartet No. 3, Op. 94: V. Recit. and Passacaglia (La Serenissima). Slow
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Schumann: String Quartets Nos. 1 & 2, Op. 41
Schubert: String Quintet in C Major, D. 956; Quartettsatz, D. 703
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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String Quintet in C Major, D. 956: III. Scherzo. Presto – Trio. Andante sostenuto
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String Quintet in C Major, D. 956: IV. Finale. Allegretto
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Haydn: String Quartets, Op. 74 "Apponyi Quartets"
Schumann: Piano Quintet; String Quartet No. 3
Brahms: Piano Quintet; String Quartet No. 2
Schubert: String Quartets No. 14 "Death and the Maiden" & No. 13 "Rosamunde"
String Quartet No. 14 in D Minor, D. 810 "Death and the Maiden": II. Andante con moto
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String Quartet No. 13 in A Minor, D. 804 "Rosamunde": I. Allegro ma non troppo
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String Quartet in G, Op. 76, No. 1: 1. Allegro con spirito
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String Quartet in B flat major, Hob.III:78, Op. 76, No. 4 "Sunrise": 1. Allegro con spirito
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String Quartet in G Major, Hob.III:75, (Op. 76, No. 1): 2. Adagio sostenuto
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String Quartet in B flat major, Hob.III:78, Op. 76, No. 4 "Sunrise": 2. Adagio
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String Quartet in G Major, Hob.III:75, (Op. 76, No. 1): 3. Menuetto: Presto
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String Quartet in B flat major, Hob.III:78, Op. 76, No. 4 "Sunrise": 3. Menuetto (Alllegro)
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String Quartet in G Major, Hob.III:75, (Op. 76, No. 1): 4. Allegro ma non troppo
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String Quartet in B flat major, Hob.III:78, Op. 76, No. 4 "Sunrise": 4. Finale (Allegro ma non troppo)
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String Quartet In D Minor, Hob. III:76 (Op. 76 No. 2 - "Fifths"): 1. Allegro
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String Quartet in D major, Hob.III:79, Op. 76, No. 5: 1. Allegretto
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String Quartet In D Minor, Hob. III:76 (Op. 76 No. 2 - "Fifths"): 2. Andante o più tosto allegretto
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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"): 3. Minuetto
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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"): 1. Allegro
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String Quartet in E flat major, Hob.III:80, Op. 76 No. 6: 1. Allegretto - Allegro
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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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String Quartet in E flat major, Hob.III:80, Op. 76 No. 6: 2. Fantasia (Adagio)
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String Quartet In C Major, Op. 76 No. 3, Hob. lll:77 "Emperor"): 3. Menuetto (Allegro)
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String Quartet in E flat major, Hob.III:80, Op. 76 No. 6: 3. Menuetto (Presto)
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String Quartet In C Major, Op. 76 No. 3, Hob. lll:77 "Emperor"): 4. Finale (Presto)
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String Quartet in E flat major, Hob.III:80, Op. 76 No. 6: 4. Finale (Allegro spirituoso)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc745891c0da3db8ff2f2cc97a8eba4950a323f7c9667f8b1f66baa7137bf87e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBBBA0202052.
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String Quartet No. 15 in A Minor, Op. 132: 1. Assai sostenuto - Allegro
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379670e711caa0edfe1297abecdb0231fc9ff69926844b214f39dee4089247b9. 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/GBBBA0401012.
String Quartet No. 15 in A Minor, Op. 132: 2. Allegro ma non tanto
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2a9f9e8728d52275c3dd25976d064375a3a855c4a5b0ce3eff2ed411dd0ba9. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBBBA0401052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f99bf0fd22d9bd431334fecfe8f5c246bed70a50b71c79aac46b0a94f43bd36. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBBBA0401013.
String Quartet No. 15 in A Minor, Op. 132: 3. Molto adagio
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff67e92a3738ec8da6cedb9a3432f77ec62877a6a134caaef46f12af1a3eb84. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBBBA0401053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e78cacd2945da399ce6c4ac17d3c272e1184ac457ebf5d48b3eaa6ed610d56. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBBBA0401014.
String Quartet No. 15 in A Minor, Op. 132: 4. Alla marcia, assai vivace - Più allegro - Presto
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee2d1d59c104064818ab396b18dbaaa9c75695dfa9157b342c3dc94befc8e67. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBBBA0401054.
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. 15 in A Minor, Op. 132: 5. Allegro appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba6c68a3aa34871ca8d33cdd6b61a657051c4d47d043b9cda2bce0dcef345ea. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBBBA0401035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b90fd26103585732e5c8cbc6c9d37b41df2dfa1388e7cd91bfb43280807cc4. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBBBA0401061.
String Quartet No. 14 in C-Sharp Minor, Op. 131: 2. Allegro molto vivace
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String Quartet No. 16 in F Major, Op. 135: 1. Allegretto
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba71c57182f0a16ef2b0af7559dc5b31a67ed31927228e06dc8d292cbb5cd8da. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBBBA0401062.
String Quartet No. 14 in C-Sharp Minor, Op. 131: 3. Allegro moderato
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String Quartet No. 16 in F Major, Op. 135: 2. Vivace
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String Quartet No. 13 in B-Flat Major, Op. 130: 3. Andante con moto ma non troppo. Poco scherzando
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.
String Quartet No. 16 in F Major, Op. 135: 3. Lento assai, cantante e tranquillo
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String Quartet No. 13 in B-Flat Major, Op. 130: 4. Alla danza tedesca. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb93466cf1bfc26960ce22e4a191c2c9af3d6788b2748ccf299d73793f5b916. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBBBA0401064.
String Quartet No. 14 in C-Sharp Minor, Op. 131: 5. Presto
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String Quartet No. 16 in F Major, Op. 135: 4. Der schwer gefaßte Entschluß. Grave - Allegro - Grave ma non troppo tratto - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e249a059add9d8e750a384081ef988b9047f9cd50f0e0e90f69dcced877057. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBBBA0401044.
String Quartet No. 13 in B-Flat Major, Op. 130: 5. Cavatina. Adagio molto espressivo
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.
String Quartet No. 14 in C-Sharp Minor, Op. 131: 6. Adagio quasi un poco andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7597c70aa3500e872b80707835a9fb5840e2998eb6d97f81f47b04ced45dd1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBBBA0401026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a578511784bed3a578f32b8b8c4813d3f03fa1cec0f703288792ac5b7d24bf0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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.
String Quartet No. 14 in C-Sharp Minor, Op. 131: 7. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213b356a0dbea0a3d684e4eae33030289187cfa58229474b7ae8610029e226c1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBBBA0401027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00934e3d25c9ffc6051cc02b4066fd18418474da4fcf4294465441fb83374b2c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBBBB0107001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945bd710279c73df917b241c637fffe13a884cdbdf3a36b70202e0b6dd24e3d2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBBBB0107009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4635edfe0c491ca166e873d2e2183fcf4b182e690958b8bf3883f39ab692825e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBBBB0107010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1f721e7ab536459b9a73f7adaa387c9bad63b0e5f30472035015a60688d8ec. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa42bdd4ee77bb0188b2c62d0e0f46b70a1a17b6b895c1a07685907fe104eb1. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBBBB0107004.
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Schubert: String Quartet in G Major / Piano Trio in E-Flat Major "Notturno"
Dvorák: Piano Quintet in A/String Quartet No.10
Piano Quintet in A, Op. 81: 1. Allegro, ma non tanto
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Piano Quintet in A, Op. 81: 2. Dumka (Andante con moto)
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Piano Quintet in A, Op. 81: 3. Scherzo (Furiant) (Molto vivace)
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Piano Quintet in A, Op. 81: 4. Finale (Allegro)
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String Quartet No. 10 in E flat major, Op. 51 - B.92: 1. Allegro ma non troppo
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String Quartet No. 10 in E flat major, Op. 51 - B.92: 2. Dumka. Andante con moto
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Schubert: Trout Quintet / Wolf: Italian Serenade / Mozart: Eine kleine Nachtmusik
Piano Quintet in A major, D. 667 "The Trout": 1. Allegro vivace
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Piano Quintet in A major, D. 667 "The Trout": 2. Andante
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Piano Quintet in A major, D. 667 "The Trout": 3. Scherzo (Presto)
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Piano Quintet in A major, D. 667 "The Trout": 4. Thema - Andantino - Variazioni I-V - Allegretto
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Piano Quintet in A major, D. 667 "The Trout": 5. Finale (Allegro giusto)
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Serenade in G major, K.525 "Eine kleine Nachtmusik": 1. Allegro
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Serenade in G major, K.525 "Eine kleine Nachtmusik": 2. Romance (Andante)
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Serenade in G major, K.525 "Eine kleine Nachtmusik": 3. Menuetto (Allegretto)
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Serenade in G major, K.525 "Eine kleine Nachtmusik": 4. Rondo (Allegro)
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Schubert: String Quartet No. 15; Piano Trio in E flat major "Notturno"
String Quartet No. 1, BB 52, Op. 7 (Sz.40): 1. Lento
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String Quartet No. 2, BB 75, Op. 17 (Sz.67): 1. Moderato
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String Quartet No. 1, BB 52, Op. 7 (Sz.40): 2. Allegretto
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String Quartet No. 2, BB 75, Op. 17 (Sz.67): 2. Allegro molto capriccioso
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String Quartet No. 1, BB 52, Op. 7 (Sz.40): 3. Introduzione. Allegro - Allegro vivace
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String Quartet No. 2, BB 75, Op. 17 (Sz.67): 3. Lento
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String Quartet No. 3, BB 93 (Sz.85): 1. Prima parte (Moderato)
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String Quartet No. 4, BB 95 (Sz.91): 1. Allegro
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String Quartet No. 3, BB 93 (Sz.85): 2. Seconda parte (Allegro)
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String Quartet No. 4, BB 95 (Sz.91): 2. Prestissimo, con sordino
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String Quartet No. 3, BB 93 (Sz.85): 3. Ricapitolazione della prima parte (Moderato)
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String Quartet No. 4, BB 95 (Sz.91): 3. Non troppo lento
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String Quartet No. 5, BB 110 (Sz.102): 1. Allegro
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String Quartet No. 4, BB 95 (Sz.91): 4. Allegretto pizzicato
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String Quartet No. 5, BB 110 (Sz.102): 2. Adagio molto
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String Quartet No. 4, BB 95 (Sz.91): 5. Allegro molto
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String Quartet No. 5, BB 110 (Sz.102): 3. Scherzo
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String Quartet No. 6, BB 119 (Sz.114): 1. Mesto - Vivace
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String Quartet No. 5, BB 110 (Sz.102): 4. Andante
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String Quartet No. 6, BB 119 (Sz.114): 2. Mesto - Marcia
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String Quartet No. 5, BB 110 (Sz.102): 5. Finale
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String Quartet No. 6, BB 119 (Sz.114): 3. Mesto - Burletta (Moderato)
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String Quartet No. 6, BB 119 (Sz.114): 4. Mesto
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Borodin/Smetana: String Quartet No.2/String Quartet No.1 "From My Life"
String Quartet No. 1 in E minor "From my Life": 1. Allegro vivo appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea03ff658aff289fd5a7331c176c3fae62225fbe83faf0b7331c679686d370c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBF079510401.
String Quartet No. 1 in E minor "From my Life": 2. Allegro moderato alla Polka
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.
String Quartet No. 1 in E minor "From my Life": 3. Largo sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c4cfc39493f6091e3775bfca89143644ceff139453b17e1a59445b6e96624e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBF079510403.
String Quartet No. 1 in E minor "From my Life": 4. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1660ecdc5e37dab8037811760d1410549487349db4c17967687996bc2ee5a9f8. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/GBF079510404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa5a9cd07df971b68d859dff970f7791ca2d1edec4efb5dd9bc9cac67779e77. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBF079510411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb5a06dc7c5570d9e1d5f89344d58d9272eba784f37028474bf45e2d01ceec2. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBF079510412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1dceab9e2e73583f270960b7edf21c3a906463c9c544ebce7d1810ee342c18. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079510413.
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.
String Quintet in C, D.956: 2. Adagio (excerpt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c41e408e3b18fb57d3d11913245d1a465815965d90836d9b13b6e034b69f62. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBBBA9150050.