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 0xa12ab447f7223415a27f33415bfa62fbb10ad4aa60fb0d4d5f44d5ca374ea165. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39c3c59e-1df6-44d0-90f9-96d1c3f118d1.json and https://artists.proofprofile.net/proofs/artist/39c3c59e-1df6-44d0-90f9-96d1c3f118d1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: String Quartets Nos. 10 & 13, Opp. 74 & 130
String Quartet No. 10 in E-Flat Major, Op. 74 "Harp": I. Poco adagio - 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972eece4af951c54cd4185df1da719390219f18e0eb5a743ff64bd315bc007ee. 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/SEAEC2368010.
String Quartet No. 10 in E-Flat Major, Op. 74 "Harp": III. Presto - Più presto quasi prestissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0373f72a4263fe28259c58800af52f863f436c3f46dafedf2576bec4e1433410. 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/SEAEC2368030.
String Quartet No. 13 in B-Flat Major, Op. 130: I. Adagio ma non troppo - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa426377d6fda77cf77e55dc50667cd00e9adc34456c77665bad150bd44897e76. 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/SEAEC2368050.
String Quartet No. 13 in B-Flat Major, Op. 130: III. Andante con moto ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd0a387047b0eaa2bed5e681f355d60b406d7e1200fef0a726a63aeca406e89. 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/SEAEC2368070.
String Quartet No. 13 in B-Flat Major, Op. 130: IV. Alla danza tedesca. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9702320c941b3784b3ee3657daa8bed0a14c4d453b8b842b366e5f9673bd5c6. 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/SEAEC2368080.
String Quartet No. 10 in E-Flat Major, Op. 74 "Harp": II. Adagio ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13241c3467d554ce42dbc8f2e5635d961c9f7045f6f69a16cacf7447c9d9752e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SEAEC2368020.
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
String Quartet No. 10 in E-Flat Major, Op. 74 "Harp": IV. Allegretto con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9545d15d5b6d93d9a2416ea72015078bcbcd64e996b767e4c119bfae0746b88. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEC2368040.
String Quartet No. 13 in B-Flat Major, Op. 130: II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114c48daa877ac4fb0b45f2ba6a4b9695ea093fc9be7d15fec576c70d51cef45. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEC2368060.
String Quartet No. 13 in B-Flat Major, Op. 130: V. Cavatina. Adagio molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb51ead16666d195000ad3ddee4faf22e7bba9ab5a2c4ee0ed057a794f212a39. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/SEAEC2368090.
String Quartet in B Minor, Op. 33 No. 1, Hob. III:37: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8350ee6ef027bb61114f3d2e8e3f1cafa20f91c69acef3815365c30fb8314ccc. 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/SEAEB2388010.
String Quartet in B Minor, Op. 33 No. 1, Hob. III:37: II. Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5bd8cd1e82ae8abe29c3f7548662521963b1eaf45fd3789684126600cfa933. 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/SEAEB2388020.
String Quartet in B Minor, Op. 33 No. 1, Hob. III:37: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72cace12f6195ad0c2a5f4ba3cafee23369aa6bc0d1c083d07572bf416f7710. 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/SEAEB2388030.
String Quartet in E-Flat Major, Op. 33 No. 2, Hob. III:38 "The Joke": I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252940e1b2941e094dcf257103422d283a17025012a62a6e4cb8f05b2f354446. 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/SEAEB2388050.
String Quartet in E-Flat Major, Op. 33 No. 2, Hob. III:38 "The Joke": IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f734efa4adb51dc87d43fda53aa4fc76f715575b3d2ce189b122125ae2fed36. 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/SEAEB2388080.
String Quartet in C Major, Op. 33 No. 3, Hob. III:39 "The Bird": III. Adagio ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945c33b2a9a52a0e594a767979a565e8e2d906643a94db6da1b693f6c7cf6031. 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/SEAEB2388110.
String Quartet in B Minor, Op. 33 No. 1, Hob. III:37: IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17adb19ca25ea8d54dd1100e4061a6e023043c259e1f90a5c7a1a6984a0faa2d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2388040.
String Quartet in E-Flat Major, Op. 33 No. 2, Hob. III:38 "The Joke": II. Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d219b982196763b01e4958b2bee39297cb96d3fff6ef6cff162396d3588b2b7. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/SEAEB2388060.
String Quartet in E-Flat Major, Op. 33 No. 2, Hob. III:38 "The Joke": III. Largo e sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23ae63a1212cde1208e0809e2dcc38b57d26584d4b4bf60d838eb020a37f51d. 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/SEAEB2388070.
String Quartet in C Major, Op. 33 No. 3, Hob. III:39 "The Bird": I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe9b829acd0d4bb089f2e9afb6c99ce709da16a1e9343e9631217d09423d175. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2388090.
String Quartet in C Major, Op. 33 No. 3, Hob. III:39 "The Bird": II. Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb4f92e7150bed908239bc4e3fea5f987960639e0f555590ff57d96e9553f1a. 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/SEAEB2388100.
String Quartet in C Major, Op. 33 No. 3, Hob. III:39 "The Bird": IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd042f74b4cefcfc8ea729d7650d829a03366aed8151965bcfe751e2f647d2ce. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2388120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d527842c786a8ce4dc40290133ad37555fe89a190ee117f3a52f103c1f58ecf. 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/SEAEB2258010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c13a096f409379b81a004f980aebd0ec488747ec6d3705e924af180a1f56393. 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/SEAEB2258040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644af5e72b97bca5b4566300c6ec4340194b46ec08b32b802e0f280caba2aea5. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/SEAEB2258020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83502daf0689979b5f9b470461bfa9393a3742f41c32713a63a215626984f305. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2258030.
Beethoven: String Quartets, Op. 18 Nos. 4-6
String Quartet No. 4 in C Minor, Op. 18 No. 4: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935894c96cc1648375ed45e472389cb1492ca4532ee345084f4bfcc76322cfdd. 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/SEAEA2198040.
String Quartet No. 4 in C Minor, Op. 18 No. 4: I. Allegro, ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff494ae1a8a1971d3650623ab774d59feebbc8706aa28a02a91bdfe96e3b013b. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SEAEA2198010.
Beethoven: String Quartets, Op. 18 Nos. 1-3
String Quartet in B-Flat Major, Op. 76 No. 4, Hob. III:78 "Sunrise": IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f24ed3abfe89bcf89c42174140f9fecea1aa281d88cb4c1dc2cd823ae7daac. 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/SEAEY2058040.
String Quartet in D Major, Op. 76 No. 5, Hob. III:79: II. Largo cantabile e mesto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251adec27a915754fde4c80c67eafab84fd1916954e619d19a7e6e10d646d660. 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/SEAEY2058060.
String Quartet in E-Flat Major, Op. 76 No. 6, Hob. III:80: I. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68a03b73791658d5648af64a6eaf6ad6eca16110e99e2bd1fc0b7ab3e6b24c0. 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/SEAEY2058090.
String Quartet in E-Flat Major, Op. 76 No. 6, Hob. III:80: II. Fantasia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5aa379e7a8af3e04f0cd77f23d568e8fc98dab2ff6c7d3b8a78cb6fe78689fd. 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/SEAEY2058100.
String Quartet in E-Flat Major, Op. 76 No. 6, Hob. III:80: IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a024851c1ae30ddde5231123a7a06a356feee4ce81f233bfc5176dc1db8684. 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/SEAEY2058120.
String Quartet in B-Flat Major, Op. 76 No. 4, Hob. III:78 "Sunrise": I. Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35fd88b44c44c91fd16260495f1e88af0e3a4d4e6166a86e48e84fc171c266a1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY2058010.
String Quartet in B-Flat Major, Op. 76 No. 4, Hob. III:78 "Sunrise": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f41abb2090578fc19d14d94e420417969daa184b16180fdc1a179a2c935f9e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY2058020.
String Quartet in B-Flat Major, Op. 76 No. 4, Hob. III:78 "Sunrise": III. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf8be7b53f0252cae237a4d320cf4d442452faf2da353d54d0e6e98b25fd28c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY2058030.
String Quartet in D Major, Op. 76 No. 5, Hob. III:79: III. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3328a54e1564bda35e85cc24b9e8bdef70e6b646bdb799f5046be38f1ba116. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SEAEY2058070.
String Quartet in D Major, Op. 76 No. 5, Hob. III:79: IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca21c47cc540a5c22d058b31de7e67ec81d949d87d7ae3f55db716cb054edf87. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY2058080.
String Quartet in G Major, Op. 76 No. 1, Hob. III:75: II. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2683566399cc1a2682346d2fb99a49c2915e39dc78521696683c3fedeafd56e0. 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/SEAEY2048020.
String Quartet in C Major, Op. 76 No. 3, Hob. III:77 "Emperor": III. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87af2378133be05f234c334a664d21bd25983dad8a8053633d5e03043145ebcd. 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/SEAEY2048110.
String Quartet in C Major, Op. 76 No. 3, Hob. III:77 "Emperor": IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ab69b30a062af876f246a779545d9438b3bd72212e34dad54b4bd417c69fdd. 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/SEAEY2048120.
String Quartet in G Major, Op. 76 No. 1, Hob. III:75: I. Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99d44e853586e65efbb0c952960403d49cc0b056d26ce8d151a645160d9f9e3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY2048010.
String Quartet in G Major, Op. 76 No. 1, Hob. III:75: III. Menuetto
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String Quartet in G Major, Op. 76 No. 1, Hob. III:75: IV. Finale
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String Quartet in D Minor, Op. 76 No. 2, Hob. III:76 "Fifths": I. Allegro
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String Quartet in D Minor, Op. 76 No. 2, Hob. III:76 "Fifths": II. Andante o più tosto allegretto
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String Quartet in D Minor, Op. 76 No. 2, Hob. III:76 "Fifths": III. Menuetto
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String Quartet in D Minor, Op. 76 No. 2, Hob. III:76 "Fifths": IV. Finale
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String Quartet in C Major, Op. 76 No. 3, Hob. III:77 "Emperor": I. Allegro
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String Quartet in C Major, Op. 76 No. 3, Hob. III:77 "Emperor": II. Poco adagio
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String Quartet No. 14 in D Minor, D. 810 "Death and the Maiden": I. Allegro
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String Quartet No. 14 in D Minor, D. 810 "Death and the Maiden": II. Andante con moto
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String Quartet No. 14 in D Minor, D. 810 "Death and the Maiden": III. Scherzo. Allegro molto
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String Quartet No. 9 in G Minor, D. 173: III. Menuetto. Allegro vivace
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String Quartet No. 14 in D Minor, D. 810 "Death and the Maiden": IV. Presto
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String Quartet in F Minor, Op. 20 No. 5, Hob. III:35: IV. Finale. Fuga a 2 soggetti
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String Quartet in A Major, Op. 20 No. 6, Hob. III:36: III. Menuet
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String Quartet in A Major, Op. 20 No. 6, Hob. III:36: IV. Fuga con 3 soggetti. Allegro
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String Quartet in D Major, Op. 20 No. 4, Hob. III:34: I. Allegro di molto
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String Quartet in D Major, Op. 20 No. 4, Hob. III:34: II. Un poco adagio e affettuoso
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String Quartet in D Major, Op. 20 No. 4, Hob. III:34: III. Menuet alla zingarese. Allegretto
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String Quartet in D Major, Op. 20 No. 4, Hob. III:34: IV. Presto e scherzando
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String Quartet in F Minor, Op. 20 No. 5, Hob. III:35: I. Moderato
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String Quartet in F Minor, Op. 20 No. 5, Hob. III:35: II. Menuet
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String Quartet in F Minor, Op. 20 No. 5, Hob. III:35: III. Adagio
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String Quartet in A Major, Op. 20 No. 6, Hob. III:36: I. Allegro di molto e scherzando
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String Quartet in A Major, Op. 20 No. 6, Hob. III:36: II. Adagio
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String Quartet in E-Flat Major, Op. 20 No. 1, Hob. III:31: I. Allegro moderato
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String Quartet in C Major, Op. 20 No. 2, Hob. III:32: I. Moderato
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String Quartet in C Major, Op. 20 No. 2, Hob. III:32: II. Adagio
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String Quartet in G Minor, Op. 20 No. 3, Hob. III:33: I. Allegro con spirito
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Mozart: String Quartet No. 15 / Mendelssohn: String Quartet No. 2
String Quartet No. 2 in A Minor, Op. 13, MWV R22: I. Adagio - Allegro vivace
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string Quartet no. 15 in D minor, K. 421: I. Allegro moderato
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Beethoven: String Quartet No. 11 "Serioso" / Mozart: String Quartet No. 16; Adagio & Fugue in C Minor"
Schubert: String Quartet No. 13 "Rosamunde" / Mozart: String Quartet No. 19 "Dissonance
String Quartet No. 19 in C Major, K. 465 "Dissonance": II. Andante cantabile
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String Quartet No. 19 in C Major, K. 465 "Dissonance": III. Menuetto. Trio (Allegro)
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String Quartet No. 13 in A Minor, D. 804 "Rosamunde": II. Andante
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String Quartet No. 13 in A Minor, D. 804 "Rosamunde": IV. Allegro moderato
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String Quartet No. 19 in C Major, K. 465 "Dissonance": I. Adagio - Allegro
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