Dénes Kovács (18 April 1930 – 11 or 14 February 2005) was a Hungarian classical violinist and academic teacher, described as "pre-eminent among Hungarian violinists". He won the Carl Flesch Internatio
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 0xe0957ad64fff4cc55e867500f36198b0497b66d211048415c605cc0bca15f74b. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dbfba7c-dec5-4d4c-b728-88b9f2c32a09.json and https://artists.proofprofile.net/proofs/artist/0dbfba7c-dec5-4d4c-b728-88b9f2c32a09.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Violin Sonata in F Major, Op. 2, No. 4, RV 20: II. Allemanda. Allegro
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 0x1ca6a88f36c88212ba74f05fc3b93eecf41f8c9b756d7604fe695b9c91385f5c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250006210 — a six-check JSON result.
Violin Sonata in F Major, Op. 2, No. 4, RV 20: IV. Corrente. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26efaa1157087081b43e17f8be9f8b37b3f32804319cc3d964ff862b28c117c0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250006212 — a six-check JSON result.
Violin Sonata in C Major, Op. 2, No. 6, RV 1: II. Allemanda. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a235187898cf336eedcad6ad3d86478bcb9baec1f1b9ef7fc6f067f44b1192e. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250006214 — a six-check JSON result.
Violin Sonata in C Major, Op. 2, No. 6, RV 1: III. Giga. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118517807c279b20a03b7815f737c3569e2a6241e62db87c9befe2fe94fb31a1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250006215 — a six-check JSON result.
Violin Sonata in G Major, Op. 2, No. 8, RV 23: I. Preludio. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab14abf2c5940e5d6722c3112c2717132c957214e3538828a5eddc8dfb4de03. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250006216 — a six-check JSON result.
Violin Sonata in G Major, Op. 2, No. 8, RV 23: III. Corrente. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6897e9e9caad7e418f573f348f1f961f67d1b474bd58d1af65dff09c24a3338b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250006218 — a six-check JSON result.
Sonata in B-Flat Major, No. 2: IV. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f630098fddaf691b83597261da40925d44122d6bf9c284c832ed21e144b314b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250016709 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2efa31e29d429e9a8386622acff91d9c2541ab58e261b0edd30daa3d58dda0. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250016713 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12683a689b1467472bbc8e0a9fb8395057af3b665d30bad277e9098d489d006. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250016729 — a six-check JSON result.
Beethoven: Symphonies Nos. 5, 7, 8 and 9 / Piano Concerto No. 3 / Violin Concerto in D Major
Sonata in D Major, No. 1: I. Grave - Allegro - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5eedc4b06e0383c3a42a6f68ae0369524fd0d490613f8a430bd23596763b6c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250016701 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed76797771b24179a84202c80355b1f85ebd23fb9603d047f57a93e752aeb1c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250016718 — a six-check JSON result.
L'Arlesienne Suite No. 2 (arr. E. Guirand for orchestra): L'arlesienne, Suite No. 2: II. Intermezzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a9e72b2ae64b35686968fc11a292a8661c3a4438fc324b9425d7a61e5ac021. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250103807 — a six-check JSON result.
Bartok: 4 Pieces - Rhapsodies for Violin and Orchestra - Concerto for Viola and Orchestra
Viennese Classicism In Slow Movements, Vol. 3: Beethoven
Beethoven: String Quartet Op. 95 and String Trio Op. 3
Schubert: Piano Trio in B Flat Major - Notturno
Trio Divertimento in E Flat Major K. 563 - Duos K. 423 and 424
Dohnányi: Ruralia Hungarica - Variations on a Nursery Song - Serenade in C Major
Dénes Kovács, Vol. 3: Hungarian Composers
The 4 Seasons: Violin Concerto in F Minor, Op. 8, No. 4, RV 297, "L'inverno" (Winter): I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58632481009f5ab9b408d9fc6868b9fcce47fab59521302d376afdf487c7b0e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA250400910 — a six-check JSON result.
Beethoven: Violin Sonatas Nos. 5, "Spring" & 9, "Kreutzer"
Mozart: Violin Sonatas Nos. 17, 19, 27 and 32
Mendelssohn: Violin Concerto in E Minor, Op. 64 / Symphony No. 4, "Italian"
Huzella / Sarkozy / Vecsey / Kokai: Concertos
Beethoven: Violin Sonatas Nos. 4 and 9, "Kreutzer"
Bartók: Rhapsodies for Violin and Piano, Contrasts, Sonata for Solo Violin
Bartók: Symphonic Works, Vol. 2 (Complete Edition)
Beethoven: Piano Concerto No. 1 / Triple Concerto for Violin, Cello and Piano, Op. 56