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 0x712f5eff8d52912b95136dda0515f76ec0abe1cb87210d7def556f9cfda10a76. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e38f4109-59c6-4ec8-b2de-13f7b214f221.json and https://artists.proofprofile.net/proofs/artist/e38f4109-59c6-4ec8-b2de-13f7b214f221.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fryderyk Chopin: Allegro de Concert in A Major, Op. 46
Karol Szymanowski: Two Mazurkas No.1, Op. 50: Sostenuto. Molto rubato
Karol Szymanowski: Two Mazurkas No.3, Op. 50: Moderato
Piotr Perkowski: Masques No.1: Andante cantabile
Piotr Perkowski: Masques No.2: Lento, sostenuto e cantabile
Piotr Perkowski: Masques No.7: Lento non troppo e tranquillo
Piotr Perkowski: Masques No.8: Andantino
Piotr Perkowski: Masques No.14: Allegretto
Marian Sawa: Four Mazurkas No.1: Lento. Moderato
Marian Sawa: Four Mazurkas No.3: Moderato cantabile
Marian Sawa: Four Mazurkas No.4: Andantino
Jan Fotek: Seven Preludes No.1 1/4 = 132
Jan Fotek: Seven Preludes No.2 1/4 = 138
Jan Fotek: Seven Preludes No.3: Allegro veloce
Jan Fotek: Seven Preludes No.4: Larghetto espressivo
Jan Fotek: Seven Preludes No.5 1/8 = ca 1/8 < 1/10 sek.
Jan Fotek: Seven Preludes No.6 1/2 = ca 60
Jan Fotek: Seven Preludes No.7: Allegro affettuoso
Paweł Łukaszewski: Two Preludes No.1: Die leiden des jungen Werthers
Paweł Łukaszewski: Two Preludes No.2: Ligeia
Marcin Wierzbicki: Variations Without A Theme
Bartosz Kowalski-Banasewicz: Etude concertante
Marcin Tadeusz Łukaszewski: Drei nachtlieder
4 Transcendental Etudes: No. 1, The Spring
4 Transcendental Etudes: No. 2, The Summer
4 Transcendental Etudes: No. 3, The Autumn
4 Transcendental Etudes: No. 4, The Winter
12 Concert Etudes: No. 1, Vivo, molto dramatico
12 Concert Etudes: No. 2, Presto con fuoco
12 Concert Etudes: No. 4, Andante dolente
12 Concert Etudes: No. 6, Marcato, molto con fuoco
12 Concert Etudes: No. 9, Energico e scherzando
12 Concert Etudes: No. 10, Vivo leggiero
12 Concert Etudes: No. 11, Tempo a piacere
Fryderyk Chopin:Prelude in C Major, No.1, Op. 28, Agitato
Fryderyk Chopin:Prelude in C Minor, No.20, Op. 28, Largo
Fryderyk Chopin:Prelude in E Major, No.9, Op. 28, Largo
Fryderyk Chopin:Prelude in E Minor, No.4, Op. 28, Largo
Fryderyk Chopin: Prelude in D-Flat Major, No.15, Op. 28, Sostenuto
Fryderyk Chopin: Prelude in D Major, No.6, Op. 28, Molto allegro
Ludwik Wawrzynowicz: Preludium in C Minor, No.2
Ludwik Wawrzynowicz: Preludium in B Minor, No.1
Ludwik Wawrzynowicz: Preludium in C-Sharm Minor, No.1
Ludwik Wawrzynowicz: Preludium in D Minor, No.2
Ludwik Wawrzynowicz: Preludium in C Minor, Oświęcim, Op. 80
Marcin Tadeusz Łukaszewski: Preludium No.4
Marcin Tadeusz Łukaszewski: Preludium No.5
Marcin Tadeusz Łukaszewski: Preludium No.6, Prélude triste
Paweł Michał Chmielnicki: I with Sensitivity
Paweł Michał Chmielnicki: III Religiosamente e tristamente
I Sonata fortepianowa "Post-Neo" na lewą rękę
Interludes romantiques: Molto espressivo e cantando
Interludes romantiques: Tempo di mazurka, rubato
Interludes romantiques: Tempo di polonaise, grandioso e trionfale
Interludes romantiques: Molto lento e tranquillo
Interludes romantiques: Grandioso e con passione
Interludes romantiques: Lento e cantabile, tristemente
Interludes romantiques: Molto espressivo e cantando II
Polonaise in A Minor, "Farewell to the Homeland"
Melody in B Major, Op. 8 No. 3 from Chants du voyageur
Chant d’amour, Op. 10 No. 2 from Album de Mai
Nocturne in B-flat Major, Op. 16 No. 4 from Miscellanea
Variations in F Minor on an Original Theme (ca. 1934–1939)
Campane IV from Symphonies of Bells (2004)
Children’s Miniatures – White Polonaise (1998)
Children’s Miniatures – Two Houses (1998)
Children’s Miniatures – Black Polka (1998)
Nocturne in C Minor, "Night and Day" (2017)
Paweł Łukaszewski: Nocturnes for Piano, Musica Profana 3 (World premiere recording)