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
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
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
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
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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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Equinox. Piano Evocations from the Golden Age
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Contrabandista (The Smuggler) Transcription by Tausig - Duo-Art 5979
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Annees De Pelerinage. 1st Year. No. 7 (Eglogue; Ecologue) - Duo-Art 74010
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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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Oubliée. Heritage Piano of Liszt, Chopin & Rachmaninoff
Miniatures. Hidden Treasures of Heritage Piano
Schmetterling. Piano Music by Chopin, Schumann and Legacy
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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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
From County Derry. Grainger, Bach & Masterworks from Golden Age of the Piano
Harmonies. Chopin, Mozart, Bach & Legacy Piano Music
Idyll. Heritage Piano Music of Beethoven & Schumann
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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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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
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
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
Wanderer. Schubert & Beethoven from the Golden Age
Cavalleria Leggera: Brilliant Piano from the Golden Age
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
The Seasons, Op. 37a: No. 10, Autumn Song (October) - Duo-Art 73520
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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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The Seasons. Op. 37A.: No. 11, Troika (November) - Welte-Mignon 1956
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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
Waltz, Op. 69, No. 2 in B Minor (Posthumous) - Welte-Mignon 964
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd0881a35d86297acdc159f60da9d1786462dd6bc079b445cee6c444c0f0bd0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEPI82435194.
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
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
Spianato. Piano Music of Chopin, Schubert & Rachmaninoff
Egeria. Piano Revelations from the Golden Age
Divertimento. Bach, Mozart & Golden Age Piano Music
Minuet. Bach, Mozart & Golden Age Piano Music
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87eb3dd1bc9dbfd484327b902e23e63e5d917537140586721a579adc783bdf7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEPI82451763.
Noel. Piano Music of Beethoven, Mozart and Legacy
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