Olga Samaroff (born Lucy Mary Agnes Hickenlooper; August 8, 1880May 17, 1948) was an American pianist, music critic, and teacher. Among her teachers was Charles-Valentin Alkan's son, Élie-Miriam Delab
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 0x12ed49cccf1f42fcb4ae2525ee608b0de149946cc890aade1d0b60f024044846. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8682b33b-d900-403a-b270-34304964ceb9.json and https://artists.proofprofile.net/proofs/artist/8682b33b-d900-403a-b270-34304964ceb9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 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 0x7adde31d4660685187eab42fcfba4d34dafb1e2e1ef33e53ebd761504f5fd87e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEPI82313019.
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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Women of Piano. Great Female Pianists of the Golden Age, Vol. 2
Etude De Concert, Op. 2, No. 6, Si Oiseau J'etais, "Were I a Bird" - Welte-Mignon 1654
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9726a778b7b02905827ebef7a0c830ad7367454b22da5eabf2094fad65f6fe60. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEPI82313495.
Pieces, Op. 2: No. 1, Etude in C-Sharp Minor - Duo-Art 7325
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Chaconne in G Major HWV 435 - Welte-Mignon 1106
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Gavotte and Variations (Arr. By Leschetizky) - Duo-Art 6217
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Éphémères. Piano Music from the Golden Age
Masters of the Roll: Ossip Gabrilowitsch & Olga Samaroff
Romance Without Words In A Flat Minor, Op. 17 No. 3
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Classical SoundScapes For Film Vol, 24: Ossip Gabrilowitsch & Olga Samaroff
Classical SoundScapes For Film Vol, 3: Ossip Gabrilowitsch & Olga Samaroff
Piano Sonata No.3 In B Minor Op.58: 1st Movement Allegro Maestoso
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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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fedec31e94c3b0e1628c9fbd5116522344d7f36a24259d512e6f2eabf38eba. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEPI82310316.
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9096f333927684020789f1869b89a8ebb9a83879a2a3b701af77d93f9f63d51. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEPI82305943.
Impromptu No. 1, Op. 29, A-Flat Major - Welte-Mignon 455
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f94754439d5c0fc934c49eb4a5740588aecbaf3766451f571f44eb6ff6e7eb. 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/DEPI82319203.
Fantasie Impromptu, Op. 66, C-Sharp Minor - Duo-Art 6058
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Women of Piano. Great Female Pianists of the Golden Age
Women of Piano. Great Female Artists of the Golden Age
Little Waltz (Mi Teresita) - Welte-Mignon 371
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf356015dffc1591f18194ad8d46d53e088005fe0f9883c8ee0bcc5e7ebabda5. 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/DEPI82309583.
Zephrys. Piano Evocations from the Golden Age
Murmuring Zephyrs. (Murmelndes Luftchen) Op. 21, No .4 - Duca 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3061be644efb34f9bf9dee3ce9a043e7fabeee864d704dcfa16b74e856d50c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEPI82416656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f390e05c45adc1a4876ca3fde1468246ef355e708c60ffbddb0c2829700bec. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/DEPI82416647.
Aeolian Murmurings. Piano Evocations from the Golden Age
Aeolian Murmurings. Op. 123 (Concert Study) - Duo-Art 5797
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Valse Sentimentale. Op. 51, No. 6 - Welte-Mignon 1679
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Waltz, Op. 39, No. 15 A-Flat Major - Duo-Art 5642.
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Valse Nonchalante. Op. 110 in D-Flat Major - Duo-Art 5831
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Wanderer. Schubert & Beethoven from the Golden Age
Women At The Piano - An Anthology Of Historic Performances, Vol. 2 (1926-1950)
Romanze. Heritage Chopin, Grieg & Tchaikovsky
The Seasons, Op. 37a: No. 6, Barcarolle (June) - Duo-Art 7128
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Beethoven, Chopin & Others: Piano Works (2024 Remaster)
Sonderausgabe für Augustinermuseum Freiburg: Johannes Brahms, Vol. 2
"Souvenirs" - 20th Century Classical Piano Rolls
Edvard Grieg: The Piano Music in Historic Interpretations
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Mirages. Hidden Treasures of Classical Piano (Extended Edition)
Scherzo No.1 in B-Flat Major (Posthumous) D.593 - Welte-Mignon 915
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Bach, J.S.: Piano Transcriptions, Vol. 1 (Great Pianists) (1925-1947)
The World's Greatest Pianists, Volume Two
Welte-Mignon Piano Rolls, Vol. 3 (1905-1926)
Éphémères. Piano Music from the Golden Age (Extended Edition)
Classical Masterworks: Classical Compositions of the 19th Century, Vol. 2