thumb|240 px|Berlin memorial plaque, Pariser Straße 21, in Berlin-Wilmersdorf, Germany Ignaz Friedman (born Salomon Izaak Freudmann; ; ; February 13, 1882January 26, 1948) was a Polish pianist and com
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 0x96956581f49ace07600ed58b4d2698567ea862875629c6242de0b366a25bc573. 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/63600f55-72c1-4fe8-8865-ffb4bb28cac5.json and https://artists.proofprofile.net/proofs/artist/63600f55-72c1-4fe8-8865-ffb4bb28cac5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Remembrances. Piano Essentials from the Golden Age
Homage to Godowsky: Piano Works Dedicated to Leopold Godowsky
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 0x664a4c625e5104a53feae1884f1bbeb71974e1e3bf5e267e4cb67bd3a6e64b5a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBAJY2031001.
Melodia appassionata in E Minor, Op. 81 No. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdc74d4dc2f8fdacc99a711d55de36e3f827166a5a2a1bc0a5f5208973575a9. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GBAJY2031020.
Adagio. Heritage Mozart, Schumann & Strauss
Ignaz Friedman - Complete Recordings 1923-1941
Classical SoundScapes For Film Vol, 35: Ignace Friedman
Classical SoundScapes For Film Vol, 31: Ignace Friedman
Piano SoundScapes Vol, 31: Ignace Friedman
Piano Quintet in C Minor, Op. 35: I. Lento – Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d1fa589b1abc0d868950628cb55d4c66a9aea5fcb278119d7bd5dc7870dc3b. 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/GBAJY1612401.
Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0252d77101498a90d5d3d573ae4fa6e44d735c6e9b3bba3885236aadd8bce1b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI191516001.
Suite in E Minor, RCT 2: Pièces de clavecin: Suite in E Minor: V. Le rappel des oiseaux (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac9323e01a124025c4e3b1f480344a8930430626a44db3bebbee7e39945ae82. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI191516002.
Les Indes galantes: Musette (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a66144d074d746bfa2ad05857bcdea032fc8961dbc07082e487a328e4883353. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI191516003.
Orfeo ed Euridice, Act II: Dance of the Blessed Spirits, "Mélodie" (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887abe5be42bd01aacad8f0004b450d8f3c185277b6e936b74edcd9f42fbecdb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI191516004.
Nocturne No. 5 in B-Flat Major, H. 37 (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1513dd1c2377760d94091a60b366c3bdf1eeb8b6a11c3e3477a07994e3dd629f. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/HKI191516005.
6 Pieces for Organ: No. 3. Prelude, fugue et variation in B Minor, Op. 18, M. 30 (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe185002d3e77c9955faa26663a7592dc1c78f4f24908d27fad8af154a3f91093. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191516006.
Nina "La folle par amour": Nina, ou La folle par amour: Romance (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca0fc7a668e802bc67fec46219935f77b52362f79c81902c85d447f25c983d2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI191516007.
Pièces de clavecin, Book 2, Suite No. 5: Le Caquet (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d707b77f0ee65b012c2066d3114b801b2819d02c58c3787fb57fc019540ed40. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191516008.
Pièces de Clavecin, Book 1, Suite No. 4: Les Fifres (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeff049d8a5e4f223324938cdfbceac729ff594e1061b2603c2e3be08742781b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191516009.
Keyboard Sonata in G Major, K.523/L.490/P.527 (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedaa83fbdfb6bacff5c9b806779d66d1495503ddf6e2b041e9c1fd4b0999ce03. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI191516010.
Keyboard Sonata in F Major, K.446/L.433/P.177 (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e691dfb24d4a294a185df7115f1625079d8e78eb10cfb0d0c3e146eda4d26eb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191516011.
Don Juan: Gavotte (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76967724b1a0cc443e3e19be6c7b378b8cc10e1cfe814597e7b3dfeae0df591. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI191516012.
Pièces de clavecin, Book 1, 5th Ordre: Pieces de clavecin, Book 1: 5th Ordre in A Major-minor: La Tendre Fanchon (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d5f26865556fe3adc81547250bb87d28c20888bf286ed7c29c63c23fd67ed5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKI191516013.
Harpsichord Sonata in G Major, Op. 1 No. 11: Adagio (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6b002d5c5c6da20b30dd03dadc2adaf10c634434f07d9f871f8919dc13e423. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191516014.
Orfeo ed Euridice: Ballet des Ombres Heureuses (arr. I. Friedman for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a89eb0cd9033c5afb542d3ac0fbd3c757637577ff6ffe014bf08fdd23590a5c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI191516015.
6 Wiener Tänze nach Motiven von Eduard Gärtner: No. 1, Tempo di valse lente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65066afb74b6ba9ade8bb051d085a51cd9cf5de8cc1b2287e470d40c8c329924. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/HKI191516101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66a182b4410bbfd394f0c3e310fc725478828230b3db56763a606e21af70008. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKI191516107.
4 Klavierstücke, Op. 27: No. 4, Im Volkson
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a92c0453d20941ce2deeb7ba02e7b55eee30765dcd5e82b904d65471b3292bf. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/HKI191516110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab6b6ee7d318db18f0e9476399f4fdd0c4c54a211cc1492be165165cdfedf72. 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/HKI191516114.
4 Preludes for Piano, Op. 61: No. 1, Pensieroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418247c354dc3b21e76169dcba6fd5ca02ac6c4673f784e8e876f5c73aefe752. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI191516125.
Ignaz Friedman Performs Original Piano Works
Frédéric Chopin: 12 Mazurkas, Berceuse, Preludes, Etudes, Valse, Polonaise and Ballade
The Great Polish Chopin Tradition: Ignacy Friedman
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90e9b2c7faf8219f54e4ef951bc1e7cc808632feae1a031919a5b7ea0300fff. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USJSJ1047841.
The Piano Masters: Ignaz Friedman / Benno Moiseiwitsch / Simon Barere / Mischa Levitzki / Alexander Brailowsky / Adrian Aeschbacher (1924-1947)
Friedman, Ignaz: Complete Recordings, Vol. 5: English Columbia Recordings (1933-1936)
Mendelssohn: Songs Without Words (Friedman) (1930-1931)
Grieg: Piano Concerto / Chopin: Sonata in B-Flat Minor (Friedman) (1927-1928)
Beethoven: 'Moonlight' Sonata / Chopin: Mazurkas (Friedman) (1923-1926)
Impressions for Piano, No. 3 "The Sanctuary"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7187ae0c1ff49af66e8063acc0f0bb6ce62ebdef5225d7e0e857b4b2cd081f1e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBAJU9600204.
Morceau Caractéristique, Op. 36: No. 6 "Étincelles"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b6aabbe8a2781ad33d347091ab0f1508ae71d9db1e8f517061e7be27890dfd. 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/GBAJU9600206.