thumb|Nicola Vaccai. Nicola Vaccai (15 March 1790 – 5 or 6 August 1848) was an Italian composer, particularly of operas, and a singing teacher. Life and career as a composer Born at Tolentino, he gre
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e875bab60c96589ae0a1e390fa4cf1d4df492d1c054f1dec04f39907b38dfb1. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/198164ae-9cc4-42cd-ae98-872662ea735e.json and https://artists.proofprofile.net/proofs/artist/198164ae-9cc4-42cd-ae98-872662ea735e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Filarmonica del Teatro Comunale di Bologna
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a20ee4daa552b8d25109767550de0193ad6936c15cf40859583756b7da83ac. 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/DEN961201310.
Samson et Dalila, Op. 47, R. 288 / Act II: "Mon coeur s'ouvre à ta voix"
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La Damnation de Faust, Op. 24 / Part 4: Scène 15. Romance. "D'amour l'ardente flamme"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc424b5ea1df0abf96f5134813fb1b211258197a3e338f04f8418cef5e96669. 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/DEN961201370.
La Reine de Saba / Act III: Plus grand, dans son obscurité
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Giulietta e Romeo / Act II: Giulietta! oh! mia Giulietta! - Ah! se tu dormi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d35b3c96bd5183cf613b3ca50972584202d3c057b957dd46362c9f712cf051d. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/DEN961201360.
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
I Capuleti e i Montecchi: Act I: No. 2: È serbata a questa acciaro
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I Capuleti e i Montecchi: Act I: No. 4: Eccomi in lieta vesta
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Vaccai: Metodo pratico de canto (Piano Accompaniment for Low Voice)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae3eff986ae01e66e34ad99d68560d7382280bcb192e5cb2b4df37a7deb722f. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DEAD65129201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea32a3479a65b2a1d47cde332226cfe06a189208f20cd403b5b58396f2b4f27. 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/DEAD65129203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bf87b8560f605ebaa39323811c37d68694094258aa63dc406908edf35d31c7. 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/DEAD65129204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558e11abe4c3f0d8e4ba349a4cdad5bcb36c945c67f5f41408fbc755d28a52fc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USHM92232260.
Lesson II. Salti di quarta / Salti di quinta
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf380c3e6b6055858c9dfd8057a13c38171b839ddfc16dd7226f00fd6c868bb8. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USHM92232262.
Vaccai: Practical Vocal Method (Accompaniments with Melody Added for Low Voice: Baritone)
Practical Vocal Method: Lesson XII Runs and Scale Passages in B-Flat Major, Andantino
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Practical Vocal Method: Lesson XII Portamento in F-Sharp Major
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Practical Vocal Method: Lesson XII Portamento in G Major
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Practical Vocal Method: Portamento the Second Way in F Major
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Practical Vocal Method: Lesson XV Recapitulation in F Major
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Practical Vocal Method: Lesson XV Recapitulation in E Major
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Practical Vocal Method: Lesson I the Diatonic Scale in B-Flat Major
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Practical Vocal Method: Lesson XI Introduction to the Trill or Shake in E-Flat Major, Allegretto
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Practical Vocal Method: Lesson XIV the Recitativo in B-Flat Major
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Vaccai: Practical Vocal Method (Accompaniments with Melody Added, For Medium Voice)
Practical Vocal Method: Lesson I the Diatonic Scale in C Major
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Practical Vocal Method: Intervals of the Third in F Major
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Practical Vocal Method: Lesson II Intervals of the Fourth in G Major
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Practical Vocal Method: Intervals of the Fifth in D Major
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Practical Vocal Method: Lesson IV Intervals of the Seventh in C Major
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Practical Vocal Method: Intervals of the Octave in C Major
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Practical Vocal Method: Lesson V Half Tones or Semitones in F Major
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Practical Vocal Method: Lesson IX the Mordent in A Major
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Practical Vocal Method: Lesson III Intervals of the Sixth in B-Flat Major
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Practical Vocal Method: Syncopation in G Major
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Practical Vocal Method: Lesson VII Runs and Scale Passages in G Major, Andantino
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Practical Vocal Method: Lesson VIII the Appogiatura Taken from Above or Below in G Major
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Practical Vocal Method: The Accaciatura in E Major
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Practical Vocal Method: Portamento the Second Way in G Major
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Vaccai: Practical Vocal Method (Accompaniments with Melody Added for High Voice, With Transpositions)
Practical Vocal Method: Lesson II Intervals of the Fourth in B-Flat Major
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Practical Vocal Method: Intervals of the Octave in D Major
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Practical Vocal Method: Lesson IX the Mordent in B-Flat Major
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Practical Vocal Method: Lesson X Introductory to the Grupetto or Turn in F Major, Allegro
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Practical Vocal Method: Lesson XI Introduction to the Trill or Shake in G Major, Allegro Moderato
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Practical Vocal Method: Lesson XII Runs and Scale Passages in D Major, Andantino
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Practical Vocal Method: Lesson I the Diatonic Scale in D Major
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Practical Vocal Method: Lesson I the Diatonic Scale in E-Flat Major
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Practical Vocal Method: Intervals of the Third in G Major
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Practical Vocal Method: Lesson II Intervals of the Fourth in A-Flat Major
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Practical Vocal Method: Intervals of the Fifth in E-Flat Major
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Practical Vocal Method: Intervals of the Fifth in F Major
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Practical Vocal Method: Lesson III Intervals of the Sixth in C Major
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Practical Vocal Method: Lesson IV Intervals of the Seventh in D Major
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Practical Vocal Method: Lesson V Half Tones or Semitones in G Major
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Practical Vocal Method: Syncopation in B-Flat Major
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Practical Vocal Method: Lesson VII Runs and Scale Passages in A Major, Andantino
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Practical Vocal Method: Lesson VIII the Appogiatura Taken from Above or Below in A Major
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Practical Vocal Method: The Accaciatura in F Major
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Practical Vocal Method: Different Ways of Executing the Mordent in G Major, Andante
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Practical Vocal Method: Lesson X Introductory to the Grupetto or Turn in F Major, Andantino
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Practical Vocal Method: Lesson X Introductory to the Grupetto or Turn in F Major, Allegretto
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Practical Vocal Method: The Grupetto or Turn in F Major
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Vlesson XI Introduction to the Trill or Shake in G Major, Allegretto
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Vaccai: Practical Vocal Method (Accompaniments with Melody Added for Low Voice: Mezzo)
Practical Vocal Method: Lesson III Intervals of the Sixth in A-Flat Major
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Practical Vocal Method: Lesson V Half Tones or Semitones in E-Flat Major
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Practical Vocal Method: Intervals of the Fifth in C Major
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Practical Vocal Method: Lesson IV Intervals of the Seventh in B-Flat Major
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Practical Vocal Method: Intervals of the Octave in A Major
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Vaccai: Practical Vocal Method (Accompaniments for Medium Voice)
Vaccai: Practical Vocal Method (Accompaniments for Low Voice [Baritone / Mezzo] with Transpositions)
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Vaccai Practical Vocal Method Accompaniments for High Voice with Transpositions
Vaccai Practical Vocal Method: Lesson I the Diatonic Scale in D Major
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Vaccai Practical Vocal Method: Lesson I the Diatonic Scale in E-Flat Major
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Vaccai Practical Vocal Method: Intervals of the Third in G Major
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Vaccai Practical Vocal Method Accompaniments with Melody Added: Soprano (Medium)
Intervals of the Fifth in D Major (Melody Added)
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Lesson III Intervals of the Sixth in B-Flat Major (Melody Added)
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Lesson VII Runs and Scale Passages in G Major, Andantino (Melody Added)
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Lesson VI Syncopation in G Major (Melody Added)
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Lesson I the Diatonic Scale in C Major (Melody Added)
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Intervals of the Third in F Major (Melody Added)
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Lesson II Intervals of the Fourth in G Major (Melody Added)
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Lesson IV Intervals of the Seventh in C Major (Melody Added)
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The Accaciatura in E Major (Melody Added)
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Vaccai Practical Vocal Method Piano Accompaniments With Melody Added: Tenor (Medium)
Vaccai Practical Vocal Method Piano Accompaniments With Melody Added: Bass.
Nicola Vaccaj - 16 Chamber Aria for Voice and Piano
Vaccai Practical Vocal Method Piano Accompaniments with Melody Added. For Low Voice (Bass, Contralto, Countertenor) with Transpositions
Vaccai Practical Vocal Method Accompaniments for Bass and Contralto with transpositions
Vaccai: Metodo pratico de canto (Piano Accompaniment for High Voice)
Harold Wayne Collection, Vol. 1 (1900-1903)