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 0xeb80068cb955d27d6f70bd79c75bff20d8e88453eaa422f6ea2d74fd8029af7b. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8e1f2e9-970c-4621-904a-7cc0676d9ea6.json and https://artists.proofprofile.net/proofs/artist/f8e1f2e9-970c-4621-904a-7cc0676d9ea6.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Violin Sonata No. 5 in F, Op. 24 'Spring': II. Adagio molto Espressivo
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 0x58470b265d051fd7004c4c2838d6e7acf3d6c960694f7fb118ec0cbdc7f9dc48. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331211945 — a six-check JSON result.
Violin Sonata No. 5 in F, Op. 24 'Spring': III. Scherzo: Allegro Molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a09f280a38048cf872cec8d6543e0f41d2aea2210a98fcc3a6d04ebed73dcd7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331211946 — a six-check JSON result.
Violin Sonata No. 5 in F, Op. 24 'Spring': IV. Rondo: Allegro ma non Troppo
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Violin Sonata No. 1 in A Minor, Op. 105: II. Allegretto
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Violin Sonata No. 1 in A Minor, Op. 105: III. Lebhaft
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Violin Sonata No. 3 in C Minor, Op. 45: II. Allegretto espressivo alla romanza
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Violin Sonata No. 3 in C Minor, Op. 45: III. Allegro animato
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Sonata No. 2 in A Major, Op. 100: II. Andante tranquillo - Vivace - Andante - Vivace di più - Andante - Vivace
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Sonata No. 2 in A Major, Op. 100: III. Allegretto grazioso, quasi Andante
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Violin Sonata No. 2 in E-Flat Major, Op. 102: I. Poco allegro più tosto moderato
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Violin Sonata No. 2 in E-Flat Major, Op. 102: II. Scherzo. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed2979843e3dffcfefd76df61accb01a504678faae7b6eb062edfa9970fe8ef. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331405796 — a six-check JSON result.
Violin Sonata No. 2 in E-Flat Major, Op. 102: III. Andante
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Violin Sonata No. 2 in E-Flat Major, Op. 102: IV. Allegro grazioso, non presto
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Violin Sonata No. 10 in G, Op. 96: II. Adagio Espressivo
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Violin Sonata No. 10 in G, Op. 96: III. Scherzo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ffd603ec6c1952c0dfb1bdbb6b53c64e7f372cac016c957ec5a75afbe28c42. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331211963 — a six-check JSON result.
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Violin Sonata, L.140: II. Intermède, fantasque et léger
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Violin Sonata, L.140: III. Finale, très animé
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Violin Sonata No. 2 in G Major, M.77: I. Allegretto
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Violin Sonata No. 2 in G Major, M.77: II. Blues. Moderato
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Violin Sonata No. 2 in G Major, M.77: III. Perpetuum mobile, allegro
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Violin Sonata in A Major, FWV 8: I. Allegretto ben moderato
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Violin Sonata in A Major, FWV 8: III. Recitativo-Fantasia, ben moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258fe07b12fb29dec14c3be4a4e871f8cce133d94f8c5952b03e6ad325e2c398. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331904111 — a six-check JSON result.
Violin Sonata in A Major, FWV 8: IV. Allegretto poco mosso
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Sonata No. 3 in D Minor, Op. 108: II. Adagio
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Sonata No. 3 in D Minor, Op. 108: III. Un poco presto e con Sentimento
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Sonata No. 3 in D Minor, Op. 108: IV. Presto Agitato
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Violin Sonata, FP 119: I. Allegro con fuoco
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Violin Sonata, FP 119: III. Presto tragico
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Santórsola: Music for Violin/Viola & Piano
D'Ambrosio: Complete Music for Violin & Piano
Vivaldi Le Quattro Stagioni; Tartini: Devil's Trill Sonata for Violin Solo
Scalero: Complete Music for Violin and Piano
Castelnuovo-Tedesco: Music for Violin and Piano
Signorine. Due profili, Op. 10: I. Dolce e tranquillo
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Molino: Sonate per chitarra e violino, Opp. 2 & 7
Sonata for Guitar & Violin, Op. 2 No. 2: II. Romanza: Adagio
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Milhaud: Complete Violin and Viola Sonatas
Violin Sonata No. 1, Op. 3: Lent et robuste - Animé
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Violin Sonata No. 2, Op. 40: I. Pastoral
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4 Visages for Viola and Piano, Op. 238: I. La Californienne
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Caltabiano: Piano Sonatina in D Major - Cello Sonata in C Major - Trio in E Major
リスト：二重奏曲（ソナタ）～ヴァイオリンとピアノのための作品全集
Thalberg & Liszt: Works for Violin and Piano
Aus der Ungarischen Krönungsmesse, S. 381: 1. Benedictus
Romance oubliée, S. 527 (Violin and Piano)
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La notte, S. 112/2 (Arr. for Violin and Piano)
Grand duo concertant sur la Romance de M. Lafont "Le marin", S. 128
Ferenc Liszt : Musica per violino e pianoforte
The Nest of the Turtledove (Original Motion Picture Soundtrack)
Gian Piero Cartocci: Irony and Lightness