1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0x63abdd37f7d7715529733418720cd25cce35c33f2cd25523338ad2f45ae4f5c0. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b28dd8c2-5224-4ae9-a9f4-64217a3834f0.json and https://artists.proofprofile.net/proofs/artist/b28dd8c2-5224-4ae9-a9f4-64217a3834f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Play It - Study Album - Flute Querflöte; Wilhelm Popp: Sonatina No. 3 in D Major / D-Dur, Op. 388 (Piano Accompaniment / Klavierbegleitung - A' = 443 Hz)
Sonatina No. 3 in D Major / D-Dur, Op. 388: I. Allegro con brio - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 108 - A' = 443 Hz
Sonatina No. 3 in D Major / D-Dur, Op. 388: II. Romance: Andante - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 dotted / punktiert = 46 - A' = 443 Hz
Sonatina No. 3 in D Major / D-Dur, Op. 388: III. Polonaise: Polacca brillante - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 104 - A' = 443 Hz
Sonatina No. 3 in D Major / D-Dur, Op. 388: I. Allegro con brio - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 84 - A' = 443 Hz
Sonatina No. 3 in D Major / D-Dur, Op. 388: II. Romance: Andante - Piano Accompaniment / Klavierbegleitung - Metronome: 1/8 = 104 - A' = 443 Hz
Sonatina No. 3 in D Major / D-Dur, Op. 388: III. Polonaise: Polacca brillante - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 76 - A' = 443 Hz
Sonatina No. 3 in D Major / D-Dur, Op. 388: I. Allegro con brio - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 63 - A' = 443 Hz
Sonatina No. 3 in D Major / D-Dur, Op. 388: II. Romance: Andante - Piano Accompaniment / Klavierbegleitung - Metronome: 1/8 = 80 - A' = 443 Hz
Sonatina No. 3 in D Major / D-Dur, Op. 388: III. Polonaise: Polacca brillante - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 56 - A' = 443 Hz
Play It - Study Album - Querflöte/Flute; Wilhelm Popp: 6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major (Piano Accompaniment / Klavierbegleitung)
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: I. Allegro energico - Piano Accompaniment - Metronome: 1/4 = 116 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: II. Serenade: Allegretto - Piano Accompaniment - Metronome: 1/4 = 56 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: III. Scherzo: Vivo - Piano Accompaniment - Metronome: 1/4 = 108 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: I. Allegro energico - Piano Accompaniment - Metronome: 1/4 = 84 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: II. Serenade: Allegretto - Piano Accompaniment - Metronome: 1/4 = 44 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: III. Scherzo: Vivo - Piano Accompaniment - Metronome: 1/4 = 80 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: I. Allegro energico - Piano Accompaniment - Metronome: 1/4 = 60 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: II. Serenade: Allegretto - Piano Accompaniment - Metronome: 1/8 = 92 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, No. 2, Sonatina in G Major: III. Scherzo: Vivo - Piano Accompaniment - Metronome: 1/4 = 56 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major (Piano Accompaniment - A' = 443 Hz)
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: I. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 100 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: II. Andante - Piano Accompaniment - Metronome: 1/4 = 56 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: III. Rondo: Allegro vivo - Piano Accompaniment - Metronome: 1/4 = 92 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: I. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 80 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: II. Andante - Piano Accompaniment - Metronome: 1/4 = 48 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: III. Rondo: Allegro vivo - Piano Accompaniment - Metronome: 1/4 = 72 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: I. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 60 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: II. Andante - Piano Accompaniment - Metronome: 1/4 = 42 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 1 in C Major: III. Rondo: Allegro vivo - Piano Accompaniment - Metronome: 1/4 = 56 - A' = 443 Hz
Danses hongroises, Op. 308 (Piano Accompaniment - A' = 443 Hz)
Danses hongroises, Op. 308: No. 1, Lento - Piano Accompaniment - Metronome: 1/4 = 56 - A' = 443 Hz
Danses hongroises, Op. 308: No. 1, Un poco vivo - Piano Accompaniment - Metronome: 1/4 = 104 - A' = 443 Hz
Danses hongroises, Op. 308: No. 1, Lento - Piano Accompaniment - Metronome: 1/4 = 48 - A' = 443 Hz
Danses hongroises, Op. 308: No. 1, Un poco vivo - Piano Accompaniment - Metronome: 1/4 = 92 - A' = 443 Hz
Danses hongroises, Op. 308: No. 1, Lento - Piano Accompaniment - Metronome: 1/4 = 40 - A' = 443 Hz
Danses hongroises, Op. 308: No. 1, Un poco vivo - Piano Accompaniment - Metronome: 1/4 = 72 - A' = 443 Hz
Danses hongroises, Op. 308: No. 2, Lento - Piano Accompaniment - Metronome: 1/4 = 60 - A' = 443 Hz
Danses hongroises, Op. 308: No. 2, Allegro vivo - Piano Accompaniment - Metronome: 1/4 = 108 - A' = 443 Hz
Danses hongroises, Op. 308: No. 2, Lento - Piano Accompaniment - Metronome: 1/4 = 52 - A' = 443 Hz
Danses hongroises, Op. 308: No. 2, Allegro vivo - Piano Accompaniment - Metronome: 1/4 = 88 - A' = 443 Hz
Danses hongroises, Op. 308: No. 2, Lento - Piano Accompaniment - Metronome: 1/4 = 44 - A' = 443 Hz
Danses hongroises, Op. 308: No. 2, Allegro vivo - Piano Accompaniment - Metronome: 1/4 = 69 - A' = 443 Hz
Danses hongroises, Op. 308: No. 3, Lento - Piano Accompaniment - Metronome: 1/4 = 52 - A' = 443 Hz
Danses hongroises, Op. 308: No. 3, Allegretto - Piano Accompaniment - Metronome: 1/4 = 100 - A' = 443 Hz
Danses hongroises, Op. 308: No. 3, Lento - Piano Accompaniment - Metronome: 1/4 = 46 - A' = 443 Hz
Danses hongroises, Op. 308: No. 3, Allegretto - Piano Accompaniment - Metronome: 1/4 = 80 - A' = 443 Hz
Danses hongroises, Op. 308: No. 3, Lento - Piano Accompaniment - Metronome: 1/4 = 40 - A' = 443 Hz
Danses hongroises, Op. 308: No. 3, Allegretto - Piano Accompaniment - Metronome: 1/4 = 60 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major (Piano Accompaniment - A' = 443 Hz)
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: I. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 92 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: II. Pastorale - Andantino - Piano Accompaniment - Metronome: 1/4 = 63 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: III. Finale - Un poco vivo - Piano Accompaniment - Metronome: 1/4 = 88 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: I. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 72 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: II. Pastorale - Andantino - Piano Accompaniment - Metronome: 1/4 = 54 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: III. Finale - Un poco vivo - Piano Accompaniment - Metronome: 1/4 = 63 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: I. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 56 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: II. Pastorale - Andantino - Piano Accompaniment - Metronome: 1/4 = 46 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 4 in F Major: III. Finale - Un poco vivo - Piano Accompaniment - Metronome: 1/4 = 50 - A' = 443 Hz
Play It - Study Album - Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur (Piano Accompaniment / Klavierbegleitung - A' = 443 Hz)
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: I. Allegro maestoso - Andante - Piano Accompaniment - Metronome: 1/4 = 126 / 1/4 = 76 - A' = 443 Hz
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: II. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 120 - A' = 443 Hz
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: III. Allegretto scherzando - Piano Accompaniment - Metronome: 1/4 = 92 - A' = 443 Hz
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: I. Allegro maestoso - Andante - Piano Accompaniment - Metronome: 1/4 = 108 / 1/4 = 63 - A' = 443 Hz
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: II. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 108 - A' = 443 Hz
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: III. Allgretto scherzando - Piano Accompaniment - Metronome: 1/4 = 72 - A' = 443 Hz
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: I. Allegro maestoso - Andante - Piano Accompaniment - Metronome: 1/4 = 84 / 1/4 = 54 - A' = 443 Hz
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: II. Allegro non troppo - Piano Accompaniment - Metronome: 1/4 = 88 - A' = 443 Hz
Little Flute Concerto / Kleines Flötenkonzert, Op. 438 in D Major / D-Dur: III. Allegretto scherzando - Piano Accompaniment - Metronome: 1/4 = 58 - A' = 443 Hz
Play It - Study Album - Querflöte/Flute; Wilhelm Popp: Spanish Dance, Spanish Serenade and Serenade of the Nightingale / Spanischer Tanz, Spanische Serenade und Nachtigallenserenade (Piano Accompaniment / Klavierbegleitung - A' = 443 Hz)
Spanish Dance / Spanischer Tanz: Tempo di Bolero - Piano Accompaniment / Klavierbegleitung - Metronome: 1/2 . = 54 - A' = 443 Hz
Spanish Dance / Spnaischer Tanz: Tempo di bolero - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 120 - A' = 443 Hz
Spanish Dance / Spanischer Tanz: Tempo di bolero - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 88 - A' = 443 Hz
Spanish Serenade / Spanische Serenade: Un poco vivo - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 96 - A' = 443 Hz
Spanish Serenade / Spanische Serenade: Un poco vivo - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 72 - A' = 443 Hz
Spanish Serenade / Spanische Serenade: Un poco vivo - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 56 - A' = 443 Hz
Serenade of the Nightingale / Nachtigallenserenade: Allegro comodo - Piano Accompaniment / Klavierbegleitung - Metronome: 1/4 = 52 - A' = 443 Hz
Serenade of the Nightingale / Nachtigallenserenade: Allegro comodo - Piano Accompaniment / Klavierbegleitung - Metronome: 1/8 = 104 - A' = 443 Hz
Serenade of the Nightingale / Nachtigallenserenade: Allegro comodo - Piano Accompaniment / Klavierbegleitung - Metronome: 1/8 = 72 - A' = 443 Hz
6 Flute Sonatinas, Op. 388, Sonatina No. 6 in D Major (Piano Accompaniment - A' = 443 Hz)
6 Flute Sonatinas, Op. 388: No. 6, Sonatina in D Major - Allegro maestoso - Piano Accompaniment - Metronome: 1/4 = 92 - A' = 443 Hz
6 Flute Sonatinas, Op. 388: No. 6, Sonatina in D Major - Allegro maestoso - Piano Accompaniment - Metronome: 1/4 = 72 - A' = 443 Hz
6 Flute Sonatinas, Op. 388: No. 6, Sonatina in D Major - Allegro maestoso - Piano Accompaniment - Metronome: 1/4 = 58 - A' = 443 Hz
Wilhelm Popp: Complete Sonatinas for Flute and Piano
Sonatina No. 1 in C Major for flute and piano, Op. 388/1: Allegro non Troppo - Remastered
Sonatina No. 1 in C Major for flute and piano, Op. 388/1: Cantilene. Andante - Remastered
Sonatina No. 1 in C Major for flute and piano, Op. 388/1: Rondo. Allegro Vivo - Remastered
Sonatina No. 2 in G Major for flute and piano, Op. 388/2: Allegro Energico - Remastered
Sonatina No. 2 in G Major for flute and piano, Op. 388/2: Serenade. Allegretto - Remastered
Sonatina No. 2 in G Major for flute and piano, Op. 388/2: Scherzo. Vivo - Remastered
Sonatina No. 3 in D Major for flute and piano, Op. 388/3: Allegro con Brio - Remastered
Sonatina No. 3 in D Major for flute and piano, Op. 388/3: Romanze. Andante - Remastered
Sonatina No. 3 in D Major for flute and piano, Op. 388/3: Polonaise. Polacca Brillante - Remastered
Sonatina No. 4 in F Major for flute and piano, Op. 388/4: Allegro non Troppo - Remastered
Sonatina No. 4 in F Major for flute and piano, Op. 388/4: Pastoral. Andantino - Remastered
Sonatina No. 4 in F Major for flute and piano, Op. 388/4: Finale. Un poco Vivo - Remastered
Sonatina No. 5 in C Major for flute and piano, Op. 388/5: Allegro Meastoso - Remastered
Sonatina No. 5 in C Major for flute and piano, Op. 388/5: Romanze. Allegretto quasi Andantino - Remastered
Sonatina No. 6 in D Major for flute and piano, Op. 388/6: Allegro Maestoso - Remastered
Rhapsodie Hongroise for flute and piano, Op. 385: Maestoso - Adagio - Presto - Remastered
Gesellschafts-Trios, Op. 409: Nr. 2 An die Natur
Gesellschafts-Trios, Op. 409: Nr. 6 Erinnerung an Richard Wagner
Gesellschafts-Trios, Op. 409: Nr. 5 Rumänisches Ständchen
Paraphrases Brillantes - Virtuoso Operatic Music for Flute and Piano
Verliebte Schelme (Amorous Rogue), Op. 448
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 → block OTSBitcoinBlock must exist at that height 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 0x07f1407c5e6bb3347281f391360aba4d854f38bc685852cd32aa582bc43dfdef. 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/DEC299318702.
Twelve Easy Pieces for Flute & Piano, Op. 371, No. 2
Sonatina No. 1, Op. 388: II. Andante (Cantilena)
Twelve Easy Pieces for Flute & Piano, Op. 371: No. 2 (Piano Accompaniment)
Sonatina No. 1, Op. 388: II. Andante (Cantilena) [Piano Accompaniment]
Vortrag-Stücke, Op. 462: No. 2, Russisches Zigeunerlied
Hungarian Dances, Op. 308: No. 3 in E Minor
Fantaisie caprice sur "Rinaldo", Op. 203
Fascination Opera: A Virtuoso Firework of Fantasies & Variations
Popp: Sandmännchen: Humoreske für Flöte und Klavier, Op. 471, No. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b8f39f8193bec80f3b1b784e21ff5ebf74c26e6b86482a1d7fceb6be9f9cea. 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/NLL6R1900511.
Popp: Vortrag-Stücke, Op.462: 2. Russisches Zigeunerlied