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 0x6e30e7b5037fad0b507bead05f5b2915ad0a9560b433f6a31973d2fd6aee5318. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f78d8b0b-c942-40c5-9058-fc598ef03b3b.json and https://artists.proofprofile.net/proofs/artist/f78d8b0b-c942-40c5-9058-fc598ef03b3b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sei piccoli pezzi: III. Canzone armena. Andantino
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 0x189f159f4b7ab2bcae748ba946ddb219a26b3329c9ccdd0a400fb9a4865a7be8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE860200108.
Jeux d'enfants, GB 142/Op. 22: III. La Poupée. Berceuse
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Pupazzetti, Op. 27: II. Berceuse. Andantino dolcissimo
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Sonatine francaise, Op. 60: No. 4: I. Romance
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Suite for Two Pianos, Op. 6: II. Andantino con moto
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Beethoven's World - Eberl, Dussek: Concertos for 2 Pianos
Concerto for Two Pianos and Orchestra in B-Flat Major, Op. 45: II. Marche. Trio. Marche
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Mozart & Czerny: Concertos for Two Pianists and Orchestra
Concerto for Two Pianos and Orchestra in E-Flat Major, K. 365: II. Andante
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Vaughan Williams: Concerto for Two Pianos & Orchestra/Symphony No. 5
Concerto for 2 Pianos and Orchestra: II. Romanze - Lento
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Concerto for 2 Pianos and Orchestra: III. Fuga chromatica - Allegro
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Wagner: Piano Transcriptions for Four Hands
Die Meistersinger von Nürnberg, WWV 96: Vorspiel
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Brandenburg Concerto No. 6, BWV 1051 (Arr. for Two Pianos by Gustav Clemens Felix Krug): I. -
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Brandenburg Concerto No. 6, BWV 1051 (Arr. for Two Pianos by Gustav Clemens Felix Krug): III. Allegro
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Es ist vollbracht, BWV 159, No. 4 (Arr. for Two Pianos by Roy Douglas)
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Sonata in D Minor, BWV 964: III. Andante (Arr. for Two Pianos by Cyril Scott)
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Schlummert ein, ihr matten Augen, BWV 82, No. 3 (Arr. for Two Pianos by Ludwig Lebell)
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Toccata in C Major, BWV 564: II. Adagio (Arr. for Two Pianos by Alexander Kelberine)
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Passacaglia in C Minor, BWV 582 (Arr. for Two Pianos by Gino Tagliapietra)
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Avec Esprit: Gouvy, Mélan-Guéroult, Saint-Saens, Ysaye
Lilli Bulléro (Variations pour deux pianos sur un air anglais), Op.62
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J.S. Bach & Reinhard Febel: 18 Studies on 'The Art of Fugue'
Prélude à l'après-midi d'un faune, L. 86 (Arr. for 2 Pianos)
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Le ruban dénoué, 12 Waltzes for Two Pianos: I. Decrets indolents du hasard
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Pour bercer un convalescent for Two Pianos: III. Andantino espressivo
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Petite Messe solennelle: I. Kyrie eleison - Christe eleison
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Petite Messe solennelle: VI. Quoniam tu solus sanctus
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Petite Messe solennelle: VIII. Credo in unum Deo
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Petite Messe solennelle: XI. Et vitam venturi saeculi
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Petite Messe solennelle: XII. Prélude religieux (pendant l'Offertoire)
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Petite Messe solennelle: XIII. Ritournelle pour le Sanctus
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Slavonic Dances, Op. 72: No. 2 in E minor. Allegretto grazioso
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Brahms Klavierkonzert Nr.1, Schubert 20 Ländler
Ländler (adapted for Piano Four Hands): IV.
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Ländler (adapted for Piano Four Hands): X.
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Ländler (adapted for Piano Four Hands): XII.
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Goldberg Variations - Version for 2 Pianos by Rheinberger/Reger: 9. Canone alla Terza. Moderato
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Goldberg Variations - Version for 2 Pianos by Rheinberger/Reger: 18. Canone alla Sexta. Alla breva
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Goldberg Variations - Version for 2 Pianos by Rheinberger/Reger: 19. Allegretto
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Goldberg Variations - Version for 2 Pianos by Rheinberger/Reger: 30. Quodlibet
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Mendelssohn-Bartholdy: Piano Works for 4 Hands
Choral Preludes for Organ, Op. posth. 122: No.10 Herzlich thut mich verlangen - Version b
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Mozart: Works for Two Pianists/Werke für zwei Pianisten, Vol. 3
Sonata for 2 Pianos in D Major, K. 448/375a: I. Allegro
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Sonata for 2 Pianos in D Major, K. 448/375a: II. Andante
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Sonata for 2 Pianos in D Major, K. 448/375a: III. Molto allegro
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Sonata for Piano Four-Hands in C Major, K. 19d: II. Menuetto - Trio
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Larghetto & Allegro for 2 Pianos in E-Flat Major, K. deest: I. Larghetto
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Mozart: Works for Two Pianists/Werke für zwei Pianisten, Vol. 1
Inspiration & Adoration - Works by Schumann & Brahms
Variationen über ein Thema von Robert Schumann, Op. 23: Thema. Leise und innig
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Schubert: Piano Music for Four Hands, Vol. IV
Schubert: Piano Music for 4 Hands, Vol. 5
Schubert: Klaviermusik zu 4 Händen Vol. 6
Schubert: Piano Music for 4 Hands, Vol. 3
Schubert: Piano Music for 4 Hands, Vol. 1
Schubert: Klaviermusik zu 4 Händen Vol. 4
Schubert: Klaviermusik zu 4 Händen Vol. 2
Brahms: 21 Hungarian Dances, WoO 1 & 16 Waltzes, Op. 39
21 Hungarian Dances, WoO 1: No. 5 in F-Sharp Minor. Allegro
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21 Hungarian Dances, WoO 1: No. 6 in D-Flat Major. Vivace
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21 Hungarian Dances, WoO 1: No. 7 in A Major. Allegretto
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21 Hungarian Dances, WoO 1: No. 9 in E Minor. Allegro ma non troppo
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21 Hungarian Dances, WoO 1: No. 11 in D Minor. Poco andante
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21 Hungarian Dances, WoO 1: No. 12 in D Minor. Presto
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21 Hungarian Dances, WoO 1: No. 15 in B-Flat Major. Allegretto grazioso
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21 Hungarian Dances, WoO 1: No. 16 in F Minor. Con moto
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21 Hungarian Dances, WoO 1: No. 19 in B Minor. Allegretto
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16 Waltzes, Op. 39 (Version for Piano Duet): No. 2 in E Major
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16 Waltzes, Op. 39 (Version for Piano Duet): No. 3 in G-Sharp Minor
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16 Waltzes, Op. 39 (Version for Piano Duet): No. 7 in C-Sharp Minor. Poco più andante
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16 Waltzes, Op. 39 (Version for Piano Duet): No. 8 in B-Flat Major
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16 Waltzes, Op. 39 (Version for Piano Duet): No. 9 in D Minor
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16 Waltzes, Op. 39 (Version for Piano Duet): No. 15 in A-Flat Major
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Felix & Fanny Mendelssohn: Piano Music for 4 Hands
Schafe können sicher weiden, BWV 208, No. 9 (Arr. for Two Pianos by Mary Howe)
Nun komm der Heiden Heiland, BWV 659 (Arr. for Two Pianos by Alexander Kelberine)
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Jesus bleibet meine Freude, BWV 147, No. 10 (Arr. for Two Pianos by Victor Babin)
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Studie 7: Nicht zu schnell (Contrapunctus 7 per Augmentationem et Diminutionem)
Goldberg Variations, BWV 988: 9. Canone alla Terza. Moderato
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