Danjulo Ishizaka (born 14 May 1979) is a German cellist and professor at the Berlin University of Arts and City of Basel Music Academy Life Ishizaka, born in Bonn, Germany, is the son of the German
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 0x909ed835bdc1d9b6540a6468a0885ea3b829c008abedd64fee08e6bb414d8dfd. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba30d356-78d7-4650-bf05-ba6e5eaab8e4.json and https://artists.proofprofile.net/proofs/artist/ba30d356-78d7-4650-bf05-ba6e5eaab8e4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Schubert: String Quartet No. 14 "Death and the Maiden", String Quintet
String Quartet No. 14 Death and the Maiden in D Minor, D. 810: I. 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 0x49dc22fe5106ca287be7acbfd4443aad02216b8eb96951644993736c656d4567. 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/CZA161302672 — a six-check JSON result.
String Quartet No. 14 Death and the Maiden in D Minor, D. 810: II. Andante con motto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e36a02fd441759809a729209eb0759348b1a3c0769bae023b48bd261b58541. 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/CZA161302673 — a six-check JSON result.
String Quartet No. 14 Death and the Maiden in D Minor, D. 810: III. Scherzo. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5d89654bd09816b51dc7a0d46c5ac3818920892d5f93e8bafb12ff55995b96. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161302674 — a six-check JSON result.
String Quartet No. 14 Death and the Maiden in D Minor, D. 810: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ce9d8e0f1609b75150bf0f66d5fd4872eec536764a5af4870fe91859788833. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161302675 — a six-check JSON result.
Quintet for 2 Violins, Viola and 2 Cellos in C Major, Op. 163, D. 956: I. Allegro, ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d74c40e9ca8f0f36aeff0a1b3ab8e9aa6e6210a658fae583b9b5290c0b3383c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CZA161302677 — a six-check JSON result.
Quintet for 2 Violins, Viola and 2 Cellos in C Major, Op. 163, D. 956: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb416e1de120bd4868d694fdbe5d1169fda14ffe0770ad4c47bb1828def80ce. 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/CZA161302678 — a six-check JSON result.
Andante cantabile (Arr. for Cello and Orchestra from String Quartet No. 1 in D Major, Op. 11)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad5e841cc9ae1ccab1a7dc3bfc54de0e2054d0241949cc6907fba2c5805f3f8. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEE470600105 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c2392954a27324a9f9d173d376d4af937c632a90205c3518b12071f4ecf93e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USBC19400532 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbbd60326d09c05f474a5d4e02d391b43d1116145ad25e8dc031e6329e82aee. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10008952 — a six-check JSON result.
The Carnival of the Animals, R. 125: XIII. Le cygne (Arr. for Cello & 2 Pianos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dff58717c7e8c8e627e16fbf77cebd9d75f8b6e5a2b23f26fc1e79121493280. 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/USBC19801420 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf416d4e439517f25e353b223c2230a5ba83a68884deb0ec4f7aca7f174c30c47. 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/USSM10606330 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2576f1175451bec07c5fbcaf08e4073c535d51041ad724df51d144ab22467e. 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/DEE860601171 — a six-check JSON result.
Cello Sonata in G Minor, Op 19: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf55d787481ca77c0f0a31e6afef3714b389717043b0812086112b7003587c2. 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/FRZ050200096 — a six-check JSON result.
Adagio for Cello and Orchestra in G Major, Op. 38
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a99e2c2f25238f5f7ba6016feffeea2d26d36400fac79a39deca72202c1220. 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/USBC19607742 — a six-check JSON result.
Arabesque No. 1, L. 66, No. 1 (Arr. for Cello and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ccd849dc6f926e5b37ef4f52be24bb9f148fa81a7d9414cd23e19bd8046da4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE860100767 — a six-check JSON result.
Violin Sonata in A Major, FWV 8 (Arr. for Cello and Piano): IV. Allegretto poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83b192de664df3a09691f4151ad15e2693eb1da9483b94e56a3885dd8e47ab9. 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/DEE860500205 — a six-check JSON result.
Porgy and Bess: Summertime (Arr. for Cello and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b613a2b7b531a2202b3e18d776972b291e149ba9283930b7db49566130ff50d. 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/USBC18600183 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5daaf0af59688a0249d2872d4bb0c5521178b39c64416fef6766ccfb5cdb2849. 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/USSM19702090 — a six-check JSON result.
Thaïs: Méditation (Arr. for Cello and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2476504401104885e6b432e3661db4de0d3eec046ce3a75ff73276640afb59. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DEE860100772 — a six-check JSON result.
Cello Sonata No. 2 in F Major, Op. 99: IV. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae91eb8f924b917c1571c2ca0b4d633f846cce22664fc7703ba3889f1ac66591. 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/USSM10008323 — a six-check JSON result.
Lasst mich allein, Op. 82, No. 1 (Arr. for Cello and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59cba67a2fb5a0baf13550258f86da4104471568bab4765cc46d8100e3285a9e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEE860500477 — a six-check JSON result.
Fantasiestücke, Op. 73: I. Zart und mit Ausdruck
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07da667605942959f71d96abef5e70047b9319758e0ea75e4ad28439a57dae8a. 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/USBC19607815 — a six-check JSON result.
Brahms: The Complete Chamber Music for Clarinet
Quintet in B Minor, Op. 115 for Clarinet and String Quartet: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf884871cd4e03e47f93f317523ef701ea8a6981970a1182733876f1359accdc5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE219166213 — a six-check JSON result.
Casella, A.: Triple Concerto, Op. 56 / Violin Concerto, Op. 48