Beryl Rubinstein (October 26, 1898 – December 29, 1952) was an American pianist, composer, and teacher. He was the father of social historian David Rubinstein. He married Elsa Landesman who attended
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 0x5fc0680a385adc44300b58da79fdf62ccc6ded51b524d4b3e4cea45eb6c638b8. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/981db25f-eaa3-4ab3-9759-b678684c066f.json and https://artists.proofprofile.net/proofs/artist/981db25f-eaa3-4ab3-9759-b678684c066f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Éphémères. Piano Music from the Golden Age
Miniatures. Hidden Treasures of Heritage Piano
From County Derry. Grainger, Bach & Masterworks from Golden Age of the Piano
Danseuses De Delphes. Piano Music of Debussy, Mendelssohn and Chopin
Aeolian Murmurings. Piano Evocations from the Golden Age
Aeolian Murmurings. Op. 123 (Concert Study) - Duo-Art 5797
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 0x66898d701d6512f1b034df88e7919c12b4891ac6e629df3af690c5ab2e74b6ce. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEPI82437454.
Valse Sentimentale. Op. 51, No. 6 - Welte-Mignon 1679
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13ed5e7ba2d57f5fc657133dfdb9e4faeec079aec01c242f82ff5cd3a34d8a2. 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/DEPI82437471.
Waltz, Op. 39, No. 15 A-Flat Major - Duo-Art 5642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5287b36958eeeb6ac795948c90f08735dabc983e319bcd4ff56bf3e28ccc569d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEPI82437912.
Valse Nonchalante. Op. 110 in D-Flat Major - Duo-Art 5831
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc509edc85d1204a263e37fb8bdd3086e55a41579fc25e522057afabf8bde87e7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEPI82437489.
Le Vent Dans La Plaine. Debussy, Beethoven, Mozart and Legacy.
Horizons. Piano Music of Mozart & Chopin
Piano Sonata No. 18 in in D Major, K. 576: II. Adagio - Duo-Art 67760
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a6e8e1d7a8ccf540c85de40546310892138ffbc50c70c57657b080092d5d56. 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/DEPI82434576.
Decorations. Piano Evocations from the Golden Age
Barcarolle No. 3, Op. 50 in G Minor - Triphonola T-51897
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72293903ba9faefa015083575c3619d617f398e1a33aa1b606ecfd3365a2d857. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEPI82422612.
Nutcracker Suite, Op. 17a (Arr. Solo Piano by Giorni): Dance of the Reed Flutes (Danse Des Mirlitons) - Duo-Art 6132
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24e28db9463e852d73ffb9b205a553fb9c485377efcc6e0bfa3d7e105730f59. 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/DEPI82422534.
Marble Halls. Piano Revelations from the Golden Age
Valse Mignonne, Op. 104 in E-Flat Major - Welte-Mignon 803
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8ae0ea1761b48d4b617a069cf13784720a58a0297c6d2795ad6e7cedc05e6b. 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/DEPI82321602.
Jesus Bleibet Meine Freude. Bach, Brahms, Debussy & Contemporaries.
Piano Recital: Glazier, Richard - Wild, E. / Gershwin, G.
7 Virtuoso Etudes after Gershwin: No. 5. Somebody Loves Me
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7042e783647a8e7dbaaa18bcd8d7de7120cd06441542b8f9551a3710a4e147d8. 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/US8270910469.
Strike up the Band: Meadow Serenade (arr. for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1081a1f06e8544126f662c04b886cc71e5747a983d53c371a76cfd2300eadd2f. 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/US8270910471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b68975a2d900e79ffa6df8d7e003633de98545a008783cc26d7b5e3998050b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US8270910475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfaca3923c8d555180c26f017ab1437935083248ef0fd98a36479fd5b3087f73. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US8270910481.
Two Grands, Four Hands: Novelty Piano Duos of the 1920s and 1930s
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7f67d76dec90e047e9c663ccacdc263d5e00b8ab923c22bcd15136bca33298. 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/USV351329537.
Bolero. Piano Evocations from the Golden Age
La Nuit. Russian Piano Music from the Golden Age
Sonatina for flute & piano: III. Allegro giocoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492e4a0d677000eb32edf51ad0db6eb4e9e914440e44df61fcad19c2dfdfe323. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBELX0100034.
Arabesque. Piano Transcriptions of Debussy, Sibelius and Verdi