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 0x7a1df105a33e4ee082dc152da743bcd8e4be500bda0dede4f3cef48a7cba379e. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45a6a343-68c3-4138-bc9f-8ce73380b30e.json and https://artists.proofprofile.net/proofs/artist/45a6a343-68c3-4138-bc9f-8ce73380b30e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
String Quartet No. 10 in E-Flat Major, Op. 125 No. 1, D. 87: III. Adagio
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 0x6ffdc83df00d404d67127c36dc545cc39ad9ee91d7a8e1908714db851472ba9f. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/DEAD61706946.
Vaughan Williams: The Complete String Quartets
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String Quartet in C Minor: II. Andantino
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String Quartet in C Minor: III. Intermezzo. Allegretto
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String Quartet in C Minor: IV. Variazione con finale fugato
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String Quartet No. 1 in G Minor: I. Allegro moderato
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String Quartet No. 1 in G Minor: II. Minuet
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String Quartet No. 1 in G Minor: III. Romance. Andante sostenuto
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String Quartet No. 1 in G Minor: IV. Finale. Rondo capriccioso
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String Quartet No. 2 in A Minor: I. Prelude. Allegro appassionato
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String Quartet No. 2 in A Minor: II. Romance. Largo
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String Quartet No. 2 in A Minor: III. Scherzo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803470231e7a02fb1140f7972226cd4dcc396352a0ca6c01ceabf7f736cb0785. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEB201734511.
String Quartet No. 2 in A Minor: IV. Epilogue. Andante sostenuto
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Richter, Dittersdorf & Rosetti: String Quartets
Brahms: String Quartets, Quintets & Sextets
String Sextet No. 1 in B-Flat Major, Op. 18: I. Allegro ma non troppo
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String Sextet No. 1 in B-Flat Major, Op. 18: II. Andante ma moderato
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String Sextet No. 1 in B-Flat Major, Op. 18: III. Scherzo. Allegro molto
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String Sextet No. 1 in B-Flat Major, Op. 18: IV. Rondo. Poco allegretto e grazioso
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Schubert: Famous String Quartets, D. 804 & D. 810 (Famous Classical Music)
Schubert: Famous String Quartets, D. 353, D. 703 & D. 887 (Famous Classical Music)
Brahms, J.: String Sextet No. 1 / String Quintet No. 2
Brahms: String Quintet No. 1 & String Sextet No. 2
Brahms, J.: String Quintet No. 1 / String Sextet No. 2
Verdi: String Quartet in E Minor / Britten: String Quartet No. 3, Op. 94
Schubert: String Quintet in C Major, D. 956 - Overture in C Minor, D. 8A
Schubert: String Quartets Nos. 9-10 and D. 103 "Quartettsatz"
Schubert: String Quartets Nos. 4, 11, and 12 "Quartettsatz"
Schubert: String Quartet No. 15 in G Major, D. 887 - String Quartet No. 5 in B-Flat Major, D. 68
Schubert: String Quartet No. 13 in A Minor, D. 804 - String Quartet No. 3 in B-Flat Major, D. 36
For Your Evening I Crisantemi, Romances op.94, Fairy tale for cello and piano, Goldberg Variations BWV988….. (Classical Masterpieces)
Schubert: String Quartet No. 14 in D Minor, D. 810 - String Quartet No. 2 in C Major, D. 32
Schubert: String Quartet No. 10 - Minuets - 5 German Dances
Brahms: String Quartet in C Minor, Op. 51
Brahms: Clarinet Quintet in B Minor, Op. 115 & String Quartet No. 3 in B-Flat Major, Op. 67
Franz Schubert: String Quartet D353, D887&D804 Rosamunde (Classical Masterpieces)
Franz Schubert: Stringquartett D703 &D810 The Death and the Maiden (Classical Masterpieces)
Piano Quintet in F Major, Op. 95: I. Allegro non troppo ed energico
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Shostakovich: String Quartet No. 3 in F Major, Op. 73
Concert Brandebourgeois No. 4 En Sol Majeur, BWV 1049: II. Andante
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Suite Pour Clavecin No. 11 En Ré Mineur, HWV 437: Sarabande
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Concerto No. 20 En Ré Mineur Pour Piano Et Orchestre, K. 466: II. Romance
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Sonate Pour Piano No. 16 En Do Majeur, K. 545, "Sonata Facile": II. Andante
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Quintette En Do Majeur, D. 956: II. Adagio
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Le Songe D'une Nuit D'été, Op. 61: VII. Nocturne, Con Moto Tranquillo
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Peer Gynt Suite No. 2, Op. 55: IV. Chanson De Solveig
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Prélude, Fugue & Variation En Si Mineur, Op. 18: I. Prélude
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Schubert: String Quartet No. 13 in A Minor, D. 804 / String Quartet No. 3 in B-Flat Major, D. 36
Schubert: String Quartet No. 10 / Minuets / 5 German Dances
5 German Dances and 7 Trios with Coda, D. 90: V. German Dance in C Major
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Brahms: String Quartet in C Minor, Op. 51, No. 1 / String Quartet in A Minor, Op. 51, No. 2
Schubert: String Quintet in C Major, D. 956 / Overture in C Minor, D. 8A
Spannende Krimiabende - Classical Music fo Thriller Evening
Schubert: String Quartet No. 14 in D Minor, D. 810 / String Quartet No. 2 in C Major, D. 32
Schubert: String Quartet No. 15 in G Major, D. 887 / String Quartet No. 5 in B-Flat Major, D. 68
Essen Und Verwohnen - Classical Music for Dinner
Brahms: Clarinet Quintet / String Quartet No. 3