thumb|250px|William Hogarth, 1741: "The Enraged Musician", sometimes identified as a caricature of Pietro Castrucci. Pietro Castrucci (1679 – 7 March 1752) was an Italian violinist and composer. Cast
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 0x4a51be621427cc540300c1c3a3a63cc7aeefa12f0df72170be07ece00bc636cf. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67c38569-1ff1-4591-bfed-49074912cbd0.json and https://artists.proofprofile.net/proofs/artist/67c38569-1ff1-4591-bfed-49074912cbd0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Concerto No. 6 for German Flute, Op. 2: I. Adagio e grazioso
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 0x5902ba8988519d43b3da7cff0ae09a4e8c23a754bccd4e3f21e895b1d8cea766. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR7JM2189010 — a six-check JSON result.
Concerto No. 6 for German Flute, Op. 2: III. Amoroso
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Trio sonata No. 5, Op. 2, HWV 390: II. Allegro
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Trio sonata No. 5, Op. 2, HWV 390: IV. Allegro
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Concerto a piu Istromenti per la Fluta, GSM 1711: III. Allegro assai
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Sonata for viola da gamba: I. Affectuoso
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The Caledonian Pocket Companion: Hugar Mu Fean
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The Caledonian Pocket Companion: Sleepy Maggy
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A Sonata of Scots Tunes: I. O Mother what shall I do (Largo)
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A Sonata of Scots Tunes: II. Ettrick Banks (Adagio)
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A Sonata of Scots Tunes: III. She rose and let me in (Andante)
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A Sonata of Scots Tunes: IV. Cromlit's Lilt (Largo)
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A Sonata of Scots Tunes: V. Polwart on the Green (Andante)
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The Caledonian Pocket Companion: Up in the Morning Early
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Pietro & Prospero Castrucci: Sonatas for Violin and B.C.
Ciaconna - After Bertali, Merula & Monteverdi
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Rinaldo, HWV 7b: Lascia ch’io pianga - Arr. for Voice Flute, Viola da gamba & Theorbo
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Sonata in D minor, Op. 1 No.10: Adagio - Excerpts Arr. for Recorder, Viola da gamba & Theorbo
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Concerto in D Minor: Adagio - Arr. for Recorder, Viola da gamba & Theorbo
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Les folies d’Espagne - Arr. for Recorder, Viola da gamba & Theorbo
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Spagnoletta - Arr. for Recorder, Viola da gamba & Guitar
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Auld Bob Morrice - Arr. for Recorder & Viola da gamba
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Recorder Recital: Schneider, Michael - Handel, G.F. / Telemann, G.P. / Barsanti, F. / Scarlatti, A. / Sammartini, G. / Mancini, F. / Castrucci, P.
Concerto in B Minor, RV 580: I. Allegro - Live
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Concerto in B Minor, RV 580: II. Largo - Larghetto - Adagio - Live
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Concerto in B Minor, RV 580: III. Allegro - Live
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Concerto in E Major, Op. 11 No. 9: I. Allegro - Live
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Concerto in E Major, Op. 11 No. 9: III. Allegro - Live
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Concerto in D Major, RV 549: I. Allegro - Live
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Concerto in A Minor, Op. 7 No. 11: II. Allegro - Live
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Concerto in A Minor, Op. 7 No. 11: V. Adagio - Live
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Concerto in G Minor, Op. 3 No. 6: I. Allegro - Live
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Concerto in G Minor, Op. 3 No. 6: II. Adagio - Live
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Concerto in G Minor, Op. 3 No. 6: III. Giga. Allegro - Live
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Concerto in F Major, Op. 4 No. 12: I. Allegro - Live
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Concerto in F Major, Op. 4 No. 12: II. Largo - Live
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L'arte della scordatura: Violin Works from Biber to Tartini
Concerti Romani: Corelli's Heritage and the Roman School
Sonatas by Mr. Castrucci & Mr. Geminiani
Simon Borutzki: Sonaten für Blockflöte (Extravaganza, The Baroque Recital)