Joseph Rupert Rudolf Marx (11 May 1882 – 3 September 1964) was an Austrian composer, teacher and critic. He is best known for his 150 lieder, most accompanied by piano, with a some scored with orchest
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 0xedf22834db3280407615cd1ad712f727c450c4bdd705d7b8de9b18ff819b1a41. 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/8b666611-b91d-4cfd-b98e-e2fe24719905.json and https://artists.proofprofile.net/proofs/artist/8b666611-b91d-4cfd-b98e-e2fe24719905.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vocal Recital: Auger, Arleen - Copland, A. / Obradors, F. / Ovale, J. / Strauss, R. / Marx, J. / Poulenc, F. / Cimara, P. (Love Songs)
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 0x80df45d6cf3287f1f671dfa51fc942b42cbd2fa5c3c221459e55475dc4a5eb7b. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/GBBBB2010601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96f2a5cb6c94c66d893f494a1c2e9f9a4f771bfdc5dbe3050a3541da5600319. 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/GBBBB2010603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884d16a5aaf4d9c65a3754e3702040bed529929a9827f4af7caa593c9e5619f7. 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/GBBBB2010606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176e33245aa343459a3627a11f6b0ebefe7e14a9f32924950a1027cb1ece2838. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBBBB2010607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06448473041fc9683c697899fcacbf3366b8e0b0a7b8bc4d207ed92733a0b1a. 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/GBBBB2010613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2788a4a6a699d9d22ddf583d801ad773a9f9ff3273a473997689d562eb4afdde. 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/GBBBB2010614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91cc18977e6db89d849442c3fa34b586e244de3c0c5d818111e626816fea81fb. 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/USB8U1029786.
Hat er mir Rosen gebracht - Songs of Joseph Marx
J. Marx: Piano Concerto in E Major "Romantic" & Castelli Romani
Marx: Suite for Cello and Piano in F Major
Marx: Eine Frühlingsmusik, Idylle & Feste im Herbst
Korngold & Marx: Piano Concertos (Hyperion Romantic Piano Concerto 18)
Romantisches Klavierkonzert in E Major: I. Lebhaft. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0612499b10e886611d13f5046c2243cce808f71e551eb73940ec9dbaed59e64. 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/GBAJY9799001.
Romantisches Klavierkonzert in E Major: II. Nicht zu langsam. Andante affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bde4909ce0661d7005d50e9fab0aad9b924b463dcf3540f4db29c1b6302a21. 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/GBAJY9799002.
Piano Concerto for the Left Hand, Op. 17: I. [Untitled]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945b9d9fbd6549e05573585efa0fdc4bc1811f784029714a262f5c7902f4dc52. 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/GBAJY9799004.
Marx: Sonata in A Major for Violin and Piano (1913)
Rarities of Piano Music 2008 - Live Recording from the Husum Festival
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59aeb99a64458d74bfc1077f5c3a11ad90c58c714dc186509dad57dfbd1cef7e. 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/DKECA0708919.
Ave Maria - Ich sehe dich in tausend Bildern
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee960d6280fcd7bd2db90f4e20f6559ba278090f2752db0f2fd5f6057856e225. 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/ATM971894012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bf97a23076cf3ae7722ddfe43f0ff2b77b2af2b0128ff43dbff6e67d3ae9c7. 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/ATM971894013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e1d15ef4f1d7916931f23bb4c33d59a1b9275104dd56c0ab08208a2f7216ce. 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/ATM971894016.
Leontyne Price - Return to Carnegie Hall
In the Twilight (The Royal Academy of Music Bicentenary Series)
Vocal Recital: Shirai, Mitsuko - Strauss, R. / Brahms, J. / Busch, A. / Loeffler, C.M. / Dargomyzhsky, A.S. / Marx, J. / Reutter, H. / Gounod, C.-F.