John Robert Sommers Armbruster (October 9, 1897 – June 20, 1994) was an American composer, conductor, pianist and songwriter. He also recorded piano rolls under the pseudonyms of Henri Bergman, Edwin
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 0xa47970b91df6edfac98c9412549d26daa6ed13d1b626b833ab081711fbb3d55d. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e47ad495-be3b-4344-8fcd-e1a5fbf663b0.json and https://artists.proofprofile.net/proofs/artist/e47ad495-be3b-4344-8fcd-e1a5fbf663b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Canzonetta: Piano Essentials from the Golden Age
Lyric Pieces, Op. 65: No. 6, Wedding Day at Troldhaugen - Welte-Mignon 378
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Ballade, Op. 24 in G Minor (Variations on a Norwegian Melody) - Duo-Art 7437
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Piano Pieces, Op. 76: No. 2, Capriccio in B Minor - Welte-Mignon 497
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Waves & Billows. Piano Evocations from the Golden Age (Extended Edition)
Ave Maria. Op. 52, No. 6 (D.839, Arr. For Solo Piano by Armbruster) - Duo-Art 102835
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A La Campagne. Op. 40: No. 1, Waves and Billows - Welte-Mignon 1200
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Samson Et Dalila: My Heart at Thy Sweet Voice - Welte-Mignon 2260
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Impromptu No.2, Op. 31 in F Minor - Welte-Mignon 1481
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Album Leaf. Op. 28: No. 3, Dance Caprice - Due-Art 04 Br
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Equinox. Piano Evocations from the Golden Age
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Souvenirs De Voyage, Op. 71: No. 6, Malagueña - Duo-Art 67827
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Contrabandista (The Smuggler) Transcription by Tausig - Duo-Art 5979
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Humoresque, Op. 10, No. 2 in G Major (Based on a French Popular Song) - Duo-Art 7115
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Annees De Pelerinage. 1st Year. No. 7 (Eglogue; Ecologue) - Duo-Art 74010
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Water Music Suite: Hornpipe (Arr. Solo Piano by Grainger) - Duo-Art 6754
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Printemps. Piano Evocations from the Golden Age
Lieder Ohne Worte. Op. 62: No. 1 in G Major - Welte-Mignon 1209
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Paganini Etudes, S. 161: No. 3, "La Campanella"
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Éphémères. Piano Music from the Golden Age
Lehmann, Lotte: Lieder Recordings, Vol. 6 (1947, 1949)
Ah! Sweet Mystery Of Life (From "Naughty Marietta")
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March of the Grenadiers (From "Love Parade")
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Beyond the Blue Horizon - (from the film "Monte Carlo")
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Oubliée. Heritage Piano of Liszt, Chopin & Rachmaninoff
Waltz, Op. 70, No. 1 in G-Flat Major (Posthumous) - Welte-Mignon 1465
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Romances, Op. 21: No. 12, 'How Painful for Me' (Arr. For Solo Piano by A.Schaefer)
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Preludes, Op. 23: No. 5 in G Minor - Triphonola 51661
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Miniatures. Hidden Treasures of Heritage Piano
Schmetterling. Piano Music by Chopin, Schumann and Legacy
Preludes, Op. 28: No. 3 in G Major - Welte-Mignon 3184
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Ecossaises, Op. 72: Three Ecossaises, Nos. 3, 4 & 5 - Duo-Art 5741
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Lyrische Stucke, Op. 43: No. 4, Voeglein Birdling (Little Bird) - Welte-Mignon 1277
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Humoresques, Op. 101: No. 7, Poco Lento E Grazioso (G♭ Major) - Welte-Mignon 1324
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Impromptu No. 1, Op. 29, A-Flat Major - Welte-Mignon 455
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Fantasie Impromptu, Op. 66, C-Sharp Minor - Duo-Art 6058
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Der Erlkonig S. 558 - Upon Piano Roll Welte-Mignon 1260, Issued 1906
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Fantasie, Op. 17 in C Major: I. Durchaus Phantastisch Und Leidenschaftlich Vorzutragen - Upon Piano Roll Welte-Mignon 361, Issued 1905
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Tandeln Und Scherzen. Bach, Mozart & Golden Age Piano Music
Well-Tempered Clavier, Book I: Prelude No. 5 in D Major BWV 850 - Duo-Art 5650
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From County Derry. Grainger, Bach & Masterworks from Golden Age of the Piano
12 Petite Pieces Pour Le Clavecin: No. 10 Andante
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12 Petite Pieces Pour Le Clavecin: No. 11 Menuetto-Trio
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12 Petite Pieces Pour Le Clavecin: No. 12 Allegretto
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12 Petite Pieces Pour Le Clavecin: No. 8 Andante
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12 Petite Pieces Pour Le Clavecin: No. 9 Menuetto Allegretto-Trio
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Harmonies. Chopin, Mozart, Bach & Legacy Piano Music
St. Matthew Passion BWV 244 (Piano Arr. By S. Bagge), Pt 1: 28. Recitativ 'Der Heiland Fällt Vorseinem Vater Nieder'
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Notebook for Anna Magdalena: 23. Marche in E-Flat Major, BWV Ahn. 127
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Notebook for Anna Magdalena: 24. (Polonaise) in D Minor, BWV Ahn. 128
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Idyll. Heritage Piano Music of Beethoven & Schumann
Bagatelles, Op. 119: No. 11, Andante Ma Non Troppo.
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Waldstein. The Legacy of Beethoven and Chopin
Chant Sans Paroles. Op. 2, No. 3 - Duo-Art 7154
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Album for the Young, Op. 39: I. 'Morning Prayer'
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Warum. Heritage Music of Schumann, Dvořák and Tchaikovsky
Rendezvous. Piano Revelations from the Golden Age
Chanson Triste, Op. 40, No. 2 - Duo-Art 5957
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Le Vent Dans La Plaine. Debussy, Beethoven, Mozart and Legacy.
Marble Halls. Piano Revelations from the Golden Age
Spanish Romance, Op. 74 - The Smuggler (Arr. For Solo Piano by Carl Tausig) - Duo-Art 7072
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Valse Mignonne, Op. 104 in E-Flat Major - Welte-Mignon 803
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Arabesque. Piano Transcriptions of Debussy, Sibelius and Verdi
Fleurettes. Piano Essentials from the Golden Age
Moments Musicaux, Op. 94: No. 3, in F Minor - Welte-Mignon 1211
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Brazilian Dances, Op. 13: No. 4, Galhofeira - Duo-Art 66560
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Harmonies. Piano Music from the Golden Age
Vintage Hollywood Classics, Vol. 9: Sonny Boy - The Merry Widow - Gold Diggers of 37 - Broadway Melody of 1936 & 1938 - The Firefly & Others
I've Got the Feelin' You're Foolin' (From "Broadway Melody of 1936")
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Wanderer. Schubert & Beethoven from the Golden Age
Cavalleria Leggera: Brilliant Piano from the Golden Age
Funf Charakterstucke, Op. 32: No. 3, Rustle of Spring (Fruhlingsrauschen) - Welte-Mignon 375
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Glissando-Mazurka, Op. 259, No.2 - Due-Art 72128
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The Tales of Hoffmann: Barcarolle - Duo-Art 101936
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Fruhlingsglaube. Historical Piano Music by Schubert, Brahms and Mozart
Le Rouet. Piano Essentials from the Golden Age
Keyboard Concerto in F Minor, BWV 1056 (Arr. Solo Piano by Cortot): II. Adagio - Upon Piano Roll Duo-Art 6330, Issued in 1921
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Capriccio, Op. 76, No. 2 in B Minor - Duo-Art 6596
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The Seasons, Op. 37a: No. 10, Autumn Song (October) - Duo-Art 73520
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Iphigenie in Aulis: Gavotte in A Major (Arr. Solo Piano by Brahms) - Duo-Art 6476
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Well Tempered Clavier, Book I: Fugue No. 5 in D Major, BWV 850 - Welte-Mignon 1836
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Harmonies. Piano Music from the Golden Age (Extended Edition)
Eau Bleu Ciel. Piano Arrangements of Handel, Haydn, Wagner and Faure
The Condon Collection, Vol. 22: Original Piano Roll Recordings
Schnebel, D.: Ein Madchen Oder … / Lang, D.: O Isis and Osiris / Riehm, R.: Ach, Konigin / Bauckholt, C.: P.S.
Overture (From "The Wonderful World of the Brothers Grimm")
Les Sylvains. Piano Evocations from the Golden Age
Two Concert Studies, S. 145: No. 2, Gnomenreigen (Dance of the Gnomes) - Duo-Art 081 Br
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Les Sylvains, Op. 60 (The Fauns) - Duo-Art 046 Br
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Toccata in G Major BWV 916, No. 3 - Duo-Art 72369
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Piano Sonata No. 11 in A Major, K.331: III. Rondo Alla Turca - Duo-Art 6228
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Romance Sans Paroles, Op. 17 No. 3 - Duo-Art 5659
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Piano Sonata No. 25, Op. 79: III. Vivace - Duo-Art 0278 Br
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Piano Sonata No. 14, Op. 27 No. 2 Quasi Una Fantasia: II. Allegretto - Duo-Art 6102
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Piano Sonata No. 13, Op. 27 No. 1: II. Molto Allegro E Vivace - Duo-Art 0287 Br
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Six Minuets for Piano, WoO 10: No. 2, Minuet in G - Duo-Art 67439
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Mazurka No. 1. Op. 21 in G Minor - Duo-Art 5945
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The Seasons. Op. 37A.: No. 11, Troika (November) - Welte-Mignon 1956
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Vistas No.2. In the Forest - Duo-Art 01 Br
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Variations on 'Weinen, Klagen, Sorgen, Zagen' BWV 12 / S. 179 - Welte-Mignon 722
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Rendezvous. Piano Revelations from the Golden Age (Extended Edition)
Fireflies. Piano Evocations from the Golden Age
Grandes Études De Paganini S. 141: No. 3, La Campanella - Triphonola T-50748
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La Fileuse, Op. 157: No. 2 (The Spinner) Etude - Welte-Mignon 1223
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Well-Tempered Clavier, Book I: Prelude in C Sharp Major, No. 3 BWV 848
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Fifth Nocturne, Op. 52, in a Flat - Duo-Art 58286
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Piano Sonata No. 18 in in D Major, K. 576: III. Alegretto - Duo-Art 67850
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Waltz, Op. 69, No. 2 in B Minor (Posthumous) - Welte-Mignon 964
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Bohemian Dance. Brilliant Piano from the Golden Age
Histories, Iji 27: No. 2, Le Petit Âne Blanc (Little White Donkey) - Duo-Art 71070
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Jeux D'eau. Piano Evocations from the Golden Age
Chaconne in G Major, HWV 435 - Welte-Mignon_3406
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Chanson Triste, Op. 40, No. 2 - Welte-Mignon_1362
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Scottish Dances (Six Ecossaisen) WoO. 83 - Duo-Art_5638
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Spianato. Piano Music of Chopin, Schubert & Rachmaninoff
Andante Spianato and Polonaise Brillante, Op. 22 - Upon Piano Roll Duo-Art 6365, Issued 1920
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Polish Songs, Op. 74: No. 1, Maiden's Wish (Arr. By Liszt) - Duo-Art 6478
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Egeria. Piano Revelations from the Golden Age
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Country Dance WoO. 14 No. 1, in C Major - Duo-Art 7205
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Hungarian Dance No. 5, in F-Sharp Minor (Arr. Solo Piano by Bauer) - Duo-Art 5814
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Divertimento. Bach, Mozart & Golden Age Piano Music
Cantata BWV. 28: Overture in D Major (We Thank Thee, O God, Arr. Solo Piano by Pouishnoff) - Duo-Art 098 Br
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Minuet. Bach, Mozart & Golden Age Piano Music
Well Tempered Clavier, Book I: Prelude No. 1 in C Major BWV 846
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Noel. Piano Music of Beethoven, Mozart and Legacy
The Seasons, Op. 37a: No. 12, Noel (December) - Duo-Art 70829
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Fantasia in D Minor, K. 397 - Duo-Art 5677
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Éclats. Piano Music from the Golden Age (Extended Edition)
Adelaide. Beethoven, Grieg & Ravel in Time
Original Motion Picture Soundtrack: Mutiny on the Bounty