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 0xa47bbad36fa67883e391db1944086fa2eaa7c5c484157d09db7eacc96cadc553. 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/4e6d3150-4cd2-4427-bd0c-0e3445d606b5.json and https://artists.proofprofile.net/proofs/artist/4e6d3150-4cd2-4427-bd0c-0e3445d606b5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto in C Major for Flute, Harp and Orchestra, K. 299: II. Andantino
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 0x4c0b764111929fdf3ae96e92d6aaee6d12bc068b39d4af565a5cbe8eeef86b39. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USBC17800001.
Piano Sonata in B-Flat Major, K. 333: II. Andante cantabile
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Violin Concerto No. 3 in G Major, K. 216: II. Adagio
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Andante in C for Flute and Orchestra, K. 315
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Clarinet Concerto in A Major, KV 622: Adagio
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Piano Concerto No. 21 in C Major, K. 467: II. Andante
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Mozart-Concertos Pour Flute-Concerto Pour Flûte Et Harpe
Stamic, Voříšek: Symphonies by Old Czech Masters
Concerto for Flute, Harp, and Orchestra in C Major, K. 299: 2b. Andantino - Pt. 2
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Mozart pro lepší učení, koncentraci a paměť
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Piano Concerto No. 23 in A Major, K. 488: II. Adagio
Kammerorchester des Saarländischen Rundfunks
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Orchestral Suite No. 3 in D Major, BWV 1068: 2. Air
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Romeo and Juliet, Op.64 / Act 1: 13. Dance of the Knights
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Vivaldi: The Four Seasons - Bach: 2 Violins Concerto
The Four Seasons, Op. 8, Violin Concerto No. 1 in E Major, RV 269 "Spring": I. Allegro
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The Four Seasons, Op. 8, Violin Concerto No. 1 in E Major, RV 269 "Spring": II. Largo e pianissimo sempre
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The Four Seasons, Op. 8, Violin Concerto No. 1 in E Major, RV 269 "Spring": III. Danza pastorale. Allegro
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The Four Seasons, Op. 8, Violin Concerto No. 2 in G Minor, RV 315 "Summer": III. Presto
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The Four Seasons, Op. 8, Violin Concerto No. 3 in F Major, RV 293 "Autumn": I. Allegro
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The Four Seasons, Op. 8, Violin Concerto No. 3 in F Major, RV 293 "Autumn": III. Allegro
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The Four Seasons, Op. 8, Violin Concerto No. 4 in F Minor, RV 297 "Winter": I. Allegro non molto
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The Four Seasons, Op. 8, Violin Concerto No. 4 in F Minor, RV 297 "Winter": II. Largo
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Concerto for 2 Violins in D Minor, BWV 1043: I. Vivace
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Ernst, Wieniawski: Romantic Violin Concertos
'Sonata facile' and other works - Mozart
Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": I. Allegro
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Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": II. Andante
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Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": III. Rondo. Allegretto
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The London Sketchbook, K. 15a-ss (Orch. Smith): [Contredanse] in G Major, K. 15e
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 2
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Piano Concerto No. 21 in C Major, K. 467: 2b. Andante - Pt. 2
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12 Contredanses for Count Czernin, K.269b - orch. Erik Smith: No. 3 in C
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Divertimento No. 15 in B Flat Major, K.287: Variation V
Academy of St. Martin in the Fields Chamber Ensemble
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Symphony No. 31 in D Major, K. 297 "Paris": 2a. Andante - Pt. 1
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Piano Sonata No. 11 in A Major, K. 331: 3. Alla Turca (Allegretto)
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Minuet in F Major from K.6 (Nannerl Notebook No. 48)
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 1
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Overture and Three Contredanses, K.106: Contredanse No. 1 in D Major
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Violin Concerto No. 3 in G Major, K. 216: 2a. Adagio - Pt. 1
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Symphony No. 33 in B-Flat Major, K. 319: 2c. Andante moderato - Pt. 3
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Idomeneo, re di Creta, K.366 / Act 1: Allegro - Live
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Minuet in F Major, K.32, (Nannerl Notebook No. 19)
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The London Sketchbook, K. 15a-ss (Orch. Smith): [Contredanse] in F Major, K. 15h
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Piano Sonata No.14 in C Minor, K. 457: 2g. Adagio - Pt. 7
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Dřízga, Košťál, Kovaříček: The Creation of A New Week, 1974
Mozart: Horn Concertos K. 412, K. 495, K. 417 & K. 447
Fiala, Rössler-Rosetti, Rejcha: Concertos for French Horns and Orchestra
Mozart: Violin Concertos Vol. 1 - Classical Navigator
Mozart: Violin Concertos Vol. 2 - Classical Navigator
Violin Concerto No. 1 in B-Flat Major, K. 207: III. Presto
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Violin Concerto No. 2 in D Major, K. 211: III. Rondeau. Allegro
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Rondo for Violin and Orchestra in C Major, K. 373
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Rubinstein: Melody No. 1 in F Major, Op. 3 (Digitally Remastered)
Toselli, Drdla: Sérénades - Scott: Au pays du lotus (Mono Version)
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Die Zauberflöte: Aria Variation (Arr. for Piano from K. 620 by Vivan und Ketan Bhatti)
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Mozart Lullaby Variation (From Wiegenlied, K. 350, Arr. for Piano by Jan-Peter Klöpfel)
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Mozart Variation III (After 12 Variationen über Ah, vous dirai-je Maman/Morgen kommt der Weihnachtsmann, K.265, Arr. for Piano by Martin Stadtfeld)
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Ave verum corpus, K.618 (Arr. for Piano by Franz Liszt)
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Piano Sonata No. 16 in C Major, K. 545 "Sonata facile" (Transcribed for Harp by Xavier de Maistre): I. Allegro
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Mozart Symphony 40 Variation (From Symphony No. 40, K. 550, Arr. for Piano by Svetoslav Karparov)
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Mozart Zauberflöte Lullaby (From Die Zauberflöte, K. 620: Der Vogelfänger bin ich ja, Arr. for Piano by Jan-Peter Klöpfel)
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Flute Quartet No. 1 in D Major, K. 285: II. Adagio
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Die Zauberflöte, K. 620: Der Vogelfänger bin ich ja (Arr. for Oboe and Orchestra by François Leleux)
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Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": III. Menuetto. Allegretto
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Concerto for Horn and Orchestra in E-Flat Major, K. 495: II. Romanza. Andante
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Larghetto & Allegro for 2 Pianos in E-Flat Major, K. deest: I. Larghetto
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Violin Concerto No. 2 in D Major, K. 211: III. Rondeau: Allegro
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Piano Sonata No. 16 in C Major, K. 545 "Sonata facile" (Transcribed for Harp by Xavier de Maistre): III. Rondo
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Eine Kleine Nachtmusik Variation (From Serenade No. 13, K. 525, Arr. for Piano by Svetoslav Karparov)
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Symphony No. 11 in D Major, K. 84 (73q): II. Andante
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Piano Concerto No. 21 in C Major, K. 467, "Elvira Madigan": II. Andante
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Piano Sonata No. 16 in C Major, K. 545: II. Andante
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Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": IV. Rondo. Allegretto
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Quintet for Clarinet and Strings in A Major, K. 581: II. Larghetto
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Clarinet Concerto in A Major, K. 622: Adagio
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Symphony No. 5 in B-Flat Major, K. 22: II. Andante
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Symphony No. 41 in C Major, K. 551, "Jupiter": III. Menuetto: Allegretto
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Symphony No. 16 in C Major, K. 128: II. Andante grazioso
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Piano Concerto No. 20 in D Minor, K. 466: II. Romance
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Serenade No. 7 in D Major, K. 250/K. 248b "Haffner": III. Menuetto
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Symphony No. 29 in A Major, K. 201: I. Allegro moderato
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Symphony No. 8 in D Major, K. 48: II. Andante
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6 Variations for Violin and Piano on "Hélas, j'ai perdu mon amant", K. 360: Theme. Andantino
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6 Variations for Violin and Piano on "Hélas, j'ai perdu mon amant", K. 360: Var. 2
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6 Variations for Violin and Piano on "Hélas, j'ai perdu mon amant", K. 360: Var. 3
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6 Variations for Violin and Piano on "Hélas, j'ai perdu mon amant", K. 360: Var. 4
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6 Variations for Violin and Piano on "Hélas, j'ai perdu mon amant", K. 360: Var. 5. Maggiore
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Dvořák: Mazurek, Romance - Schubert: Polonaise - Schumann: Fantasy
Paganini, Martinů, Tausinger, Ulrich, Nejedlý: Works for Violin
Ostrčil: String Quartet in B Major, Op. 4, Sonatina, Op. 22
Křivinka, Stanislav, Flosman: Violin Sonatas