thumbnail|upright=1.6|The Pavel Haas Quartet's first album.(Released in 2006 on Supraphon SU 3877-2 131) The Pavel Haas Quartet is a Czech string quartet founded in 2002."Class of 2007". BBC Music Mag
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 0x6bcb2b9edc8c094bb93ed595676f5b6bac5393e53cd0ca91ab9e639ed72d8089. 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/f672f6b3-2472-4ff8-a597-d5c516a7f900.json and https://artists.proofprofile.net/proofs/artist/f672f6b3-2472-4ff8-a597-d5c516a7f900.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
String Quartet No. 1 in E Minor, JB 1:105: I. Allegro vivo appassionato
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 0x7fa81e4e22db85653875e60ba2efcb603f0d0ef3e07fcfa22591dbb90faba9f5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161500564 — a six-check JSON result.
String Quartet No. 1 in E Minor, JB 1:105: II. Allegro moderato a la polka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc723f045c70c942df3b2eceefc0aa62d1f1ba8c0a3175ea4c9cd5702134b733. 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/CZA161500565 — a six-check JSON result.
String Quartet No. 1 in E Minor, JB 1:105: III. Largo sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7592907d2fe96d7413e0784a8589d788344f9f2041577a9d0897442092d92e59. 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/CZA161500566 — a six-check JSON result.
String Quartet No. 1 in E Minor, JB 1:105: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf002a52c41f724f3950ff153788c9023e74d7ed24926ffb411567f40beb30592. 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/CZA161500567 — a six-check JSON result.
String Quartet No. 2 in D Minor, JB 1:124: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e16538c189e4f24cb72c3356f0b66b55fc0bebdb88034c15bc37ad8f6356c59. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161500570 — a six-check JSON result.
String Quartet No. 2 in D Minor, JB 1:124: II. Allegro moderato - Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7abc8ee54a373ef84e9a88837a423893a410c30b4d19781bec16bbf1299876. 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/CZA161500571 — a six-check JSON result.
String Quartet No. 2 in D Minor, JB 1:124: III. Allegro non piú moderato, ma agitato e con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b35e67b4e454d41002f448fc1d4883bbb8ae81f98ad52d4e74a7b199deb6f9. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/CZA161500572 — a six-check JSON result.
String Quartet No. 2 in D Minor, JB 1:124: IV. Finale. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d19f12df2123f47d756c712fc447a76e7a9ff913150f2077ae169c04a826a6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CZA161500573 — a six-check JSON result.
Piano Quintet in F Minor, Op. 34: I. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a9aa7ee060f878e39c8c766813f550a2e2285526b7b2e4b737ea7fc7aba04e. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/CZA162200125 — a six-check JSON result.
Piano Quintet in F Minor, Op. 34: II. Andante, un poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4d497c47526ac4d94a1cdab70a2c090a83f0e72594f0d42e049409a1da36cc. 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/CZA162200126 — a six-check JSON result.
Piano Quintet in F Minor, Op. 34: III. Scherzo. Allegro - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3914e6a4f1b71144f29cbda773a99b855724c4a6b6fae9fb8c73e87eea0dd8e1. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CZA162200127 — a six-check JSON result.
Piano Quintet in F Minor, Op. 34: IV. Finale. Poco sestenuto - Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb38999b9034ca0012b51d8e13b65814ead560ceb63744f9864f385120317bf4. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/CZA162200128 — a six-check JSON result.
String Quintet No. 2 in G Major, Op. 111: I. Allegro non troppo, ma con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2990bebe9fbc9cc50c0e241e34ec7883985f392549d17daaf0bfe8a0875fe164. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/CZA162200131 — a six-check JSON result.
String Quintet No. 2 in G Major, Op. 111: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0616e3d182fc85959fce13f0b0d6e7fed5ccc3732c9ae24d56b65c1b6c77fadd. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162200132 — a six-check JSON result.
String Quintet No. 2 in G Major, Op. 111: III. Un poco allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6be6bc427809dede253e32c638a262da3d31a8f0e519eef0aa8a5d96caf824. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CZA162200133 — a six-check JSON result.
String Quintet No. 2 in G Major, Op. 111: IV. Vivace ma non troppo presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2a3102b3d31d35f2113766fb51a5879af82e8b925f9242ada30044796d978c. 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/CZA162200134 — a six-check JSON result.
Piano Quintet No. 2, Op. 81, B. 155: I. Allegro, ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33444d12e172df860129b72d1468828f3fea0e6c1b04d1ef82a8c40db87c9c58. 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/CZA161701126 — a six-check JSON result.
Piano Quintet No. 2, Op. 81, B. 155: II. Dumka. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c301ef02dd19a5e5f07cd4806fc705153f96bebe84d74a9ad8f58e9f3b721e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161701127 — a six-check JSON result.
Piano Quintet No. 2, Op. 81, B. 155: III. Scherzo - Furiant. Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2273798fa4968721b4428cdb4b7bc4975cacada57be0e5345e5958f094ca75e9. 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/CZA161701128 — a six-check JSON result.
Piano Quintet No. 2, Op. 81, B. 155: IV. Finale. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3f859b05496dcdcc4b93214edb3201a35a5a44b80242c464fe620db5f6ad58. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/CZA161701129 — a six-check JSON result.
String Quintet, Op. 97, B. 180: I. Allegro non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbf242a0b8912959ccad23cb7091a595d89eb1f0aa6d8a53b500f24c84a1b22. 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/CZA161701131 — a six-check JSON result.
String Quintet, Op. 97, B. 180: II. Allegro vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c93d26458021b0d5688a2f9f5c9a810c6a6717b37bebf48c309cbdaba05f74. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/CZA161701132 — a six-check JSON result.
String Quintet, Op. 97, B. 180: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0acf0be524301dcd819aff3b9ebe1e66a250e15311fc7cdfe325c8117c5e94b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CZA161701133 — a six-check JSON result.
String Quintet, Op. 97, B. 180: IV. Finale. Allegro giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c0336d46e18de414e5095c133c10b62caf535a544f52632bbcaa9c11ef92ef. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161701134 — a six-check JSON result.
Shostakovich: String Quartets Nos. 2, 7 & 8
String Quartet No. 2 in A Major, Op. 68: I. Ouverture. Moderato con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27ae69618c5ffe82a3ed0b0ff31965807a5f20ec80f3a4a139de8d5844fccd5. 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/CZA161900900 — a six-check JSON result.
String Quartet No. 2 in A Major, Op. 68: II. Recitative and Romance. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68514a2931bd27f89a452e1e2db831a27db2874329fff1d898132347f78d9c59. 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/CZA161900901 — a six-check JSON result.
String Quartet No. 2 in A Major, Op. 68: III. Waltz. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a63ad2eafb079aa352d8c3b09abd8e58a17fe9f1ca8144218d498950437b0d. 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/CZA161900902 — a six-check JSON result.
String Quartet No. 2 in A Major, Op. 68: IV. Theme with Variations. Adagio - Moderato con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120701446146088b748cd5d2913626d06d07230be45ed63bfaaf708ada1f3119. 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/CZA161900903 — a six-check JSON result.
String Quartet No. 7 in F-Sharp Minor, Op. 108: No. 1, Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda46ef6981656d4427a57b75d0bd884e68388d6b54230f0415e6c73a933f37f4. 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/CZA161900905 — a six-check JSON result.
String Quartet No. 7 in F-Sharp Minor, Op. 108: No. 2, Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ab95f2f60825a1c8b9a24d872683fbe16dc206254055a3d8d5c9b29faaba85. 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/CZA161900906 — a six-check JSON result.
String Quartet No. 7 in F-Sharp Minor, Op. 108: No. 3, Allegro - Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778a4e5179e4be45804d4cea51ff0320da37738f84173923775f16c599e23d8d. 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/CZA161900907 — a six-check JSON result.
String Quartet No. 8 in C Minor, Op. 110: No. 1, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2458371c825c8712b2a48a11e80f49d89f05467b3594c3fa156ef6a1ce292f02. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CZA161900909 — a six-check JSON result.
String Quartet No. 8 in C Minor, Op. 110: No. 2, Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bcec2b8ed24792a2e796dbbfa3209e0368ad4e3faf9569e12d5fac934b6f6fa. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/CZA161900910 — a six-check JSON result.
String Quartet No. 8 in C Minor, Op. 110: No. 3, Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb402cdcfb4c1c1b42b5efe6a2796a3cdd3cfd42321a649418226c5e817025c33. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CZA161900911 — a six-check JSON result.
String Quartet No. 8 in C Minor, Op. 110: No. 4, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997d0cae698d06396f96f6cdd1cb494aad61163dce306381286854dfe41b8bac. 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/CZA161900912 — a six-check JSON result.
String Quartet No. 8 in C Minor, Op. 110: No. 5, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e31e6461356606534e8c6e308f6ae2ad368ce27d265381ce8f042929b88d1c. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/CZA161900913 — a six-check JSON result.
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
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.
String Quartet No. 13 in G Major, Op. 106, B. 192: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af246c425179d1ebb859c62d41a0fb2d7f1bec0e876230b9407e6dd3f08cd27. 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/CZA161002560 — a six-check JSON result.
String Quartet No. 13 in G Major, Op. 106, B. 192: II. Adagio ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66add35be9d55cff3b2fd7b0d92b31ec33f6f112438c0d590de9351c6b422501. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161002561 — a six-check JSON result.
String Quartet No. 13 in G Major, Op. 106, B. 192: III. Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb3a8ce0e30d4664583ba9c891f405d498fdb6637240bd57e68fb41641560ca. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/CZA161002562 — a six-check JSON result.
String Quartet No. 13 in G Major, Op. 106, B. 192: IV. Finale. Andante sostenuto - Allegro con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5280ae3199713143ebe561caf9759c956290a98fb3c9d3b4233039b70b3ada. 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/CZA161002563 — a six-check JSON result.
String Quartet No. 12 in F Major, Op. 96, B. 179 "American": I. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c183eeaf15f973a86b0401796d56f5de4dac0f9841f741540854c920c80c367. 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/CZA161002555 — a six-check JSON result.
String Quartet No. 12 in F Major, Op. 96, B. 179 "American": II. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e11d32e0390320290cc25c34f7289784b9a36ea943520f0545e788c1651f25. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161002556 — a six-check JSON result.
String Quartet No. 12 in F Major, Op. 96, B. 179 "American": III. Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3c86109afbfcc0cff66da52faf265aa6685381ff4b94f4f4da2b81adf3cef1. 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/CZA161002557 — a six-check JSON result.
String Quartet No. 12 in F Major, Op. 96, B. 179 "American": IV. Finale. Vivace ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ed0f5cf867f747ada4b57d41bf33d24483c84fc184da4daa170a0c9fd8703d. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/CZA161002558 — a six-check JSON result.
Prokofiev: String Quartets Nos 1 & 2, Sonata for Two Violins
String Quartet No. 1 in B Minor, Op. 50: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983652c93aaa4ffe2d68295a3f9c90f207710a6856fb2de97d20185ea47d9156. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/CZA160901637 — a six-check JSON result.
String Quartet No. 1 in B Minor, Op. 50: II. Andante molto - Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55464644f795fdcb66135490b0890c3f7b7981ce6e432ff7ecb0b3f52bd4f7c. 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/CZA160901638 — a six-check JSON result.
String Quartet No. 1 in B Minor, Op. 50: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4cb93d19e0ba45e051a2997216f0fc2b2cf99029922ec840e855fb10378d1de. 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/CZA160901639 — a six-check JSON result.
Sonata for 2 Violins in C Major, Op. 56: I. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98afa0603b3e4f03c634f52739cb4f56caefa553f2880d5b4114251016d44d39. 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/CZA160901641 — a six-check JSON result.
Sonata for 2 Violins in C Major, Op. 56: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc836b43350b74b44089c5631ff2a8da6729bca7f6517737dd50dc29de2a18f1. 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/CZA160901642 — a six-check JSON result.
Sonata for 2 Violins in C Major, Op. 56: III. Commodo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a9f35e9cbd0354f03a9f7cd547c4748d55c81210542cd63917db4984586eb9. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160901643 — a six-check JSON result.
Sonata for 2 Violins in C Major, Op. 56: IV. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c00b372aabcfee07631fd17a446d39aa354a840ba85ce6ff403ee537eccb52d. 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/CZA160901644 — a six-check JSON result.
String Quartet No. 2 in F Major, Op. 92: I. Allegro sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9379f363fc1d30bf8c87827c220149180311c12b09a0bea9c8580128c15d15. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160901645 — a six-check JSON result.
String Quartet No. 2 in F Major, Op. 92: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa86798f31ebd768e84be41b070e641a33e3de03ac42420c865cbd991bee624. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160901646 — a six-check JSON result.
String Quartet No. 2 in F Major, Op. 92: III. Allegro - Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d52040b795d2d1d664a9b4398bc805a100387401865b2f2c44e4508e42b1b3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160901647 — a six-check JSON result.
String Quartet No. 1 in C-Sharp Minor, Op. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1009c1ecd4bbaf72a9af1f992833bf96a6d38a3fdd3a327d4ab426ef22313d53. 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/CZA160705394 — a six-check JSON result.
String Quartet No. 2, Op. 7 "From the Monkey Mountains": IV. Wild Night. Vivace e con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60378cf5e5687bbff0aeafa51e16cf2356c07c05a3c6f2069f5db4eca0116489. 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/CZA160608078 — a six-check JSON result.