Frank Bungarten (born 6 May 1958)Maurice J. Summerfield: The Classical Guitar. Its Evolution, Players and Personalities Since 1800, 5th edition (Blaydon-on-Tyne: Ashley Mark, 2002), p. 73–74. is a cla
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 0x97ec1cc7ece3b2c8aa7c00bc06f28d1cbdd946fdc75fb8bedb91de52b237b70d. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b59a4df-896a-4a29-84cb-0b27a6665f48.json and https://artists.proofprofile.net/proofs/artist/4b59a4df-896a-4a29-84cb-0b27a6665f48.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x62afd343c150daaaf1c495d31cf7cb2d5cff3a517c9b05176b426ab57521b20d. 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/DEA142328201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2727e3150290d970f02a5d3a1c9fb010b5a81d45d20812f2222f465d0ac5e90. 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/DEA142328202.
Six Divertimenti, Op. 2: IV. Tempo di Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d684ca61284a6783ec03c5325e99e176b6ab789021eb65a74e9cccddc86aa1d. 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/DEA142328207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7953d39272360a39e4598006ad4b3536cf5826d4cf6512eaaf38266b2e61a372. 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/DEA142328208.
Six Petites Pièces, Op. 32: I. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e129e18ab0b546c0307440613c24a692e8fae61b4fe02543ce511e346fff61. 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/DEA142328210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456ccdbe05bb4ef30d87fa6ab567e2957848bd6274435149e425fe6142732823. 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/DEA142328211.
Six Petites Pièces, Op. 32: III. Andante pastorale - Mazurka - Andante pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64dae1c498a26a6ea265e12fb84b2151928d2d3e8f18df5a9e2d9800d389b16. 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/DEA142328212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa62e2348d2cf76cbcaedb0bce372cbd58f035d64dd4906cdeea06cfe6396e6. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEA142328203.
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
Six Divertimenti, Op. 2: I. Tempo di Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38a48a30a6c1c25730c9b29d1f859f4aa8d2787d9c06b30e9dd4e661115ec4a. 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/DEA142328204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685e9c6a059077581dd25f51b8cfbbc3f624fa4ae2918e6fee118a998b946bea. 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/DEA142328205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1602abdf743c33ab8c119ca91f54610949ed39d16348f45ded18401a3ddcf228. 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/DEA142328206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60edb0ace1270c2e52372aef5b46806c5727cfd1495416a72414937f7151a0ea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA142328209.
Six Petites Pièces, Op. 32: IV. Andante - Galop - Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd563bd5b113790e9c86d7b2f145e2e22d7dfd1fe95f8af43639e0dc6af7a87. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA142328213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe59404e647e7e2b2b34c89943c74bec76f79879642b81458c62a651f8ac7239. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA142328214.
Deuxième Grande Sonate, Op. 25: I. Andante, Largo - II. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c58a3a66ec67bc6efd438d05e141ccffa8cfe8a0a8bfe3d174c891d53b8879. 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/DEA142226303.
Deuxième Grande Sonate, Op. 25: IV. Minuetto - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31bf539d2bf8b46bb11561803b8e096028be3b7d99b8ffb3e65ed90ff2d4073b. 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/DEA142226305.
Mes Ennuis. Six Bagatelles, Op. 43: No. 1, Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc3b4dd96fd891b3fcd135b6dc85a6384f2bbb1c2d1056856dc932aab09b582. 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/DEA142226306.
Mes Ennuis. Six Bagatelles, Op. 43: No. 5, Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d578dc4025e846b61353c7cb27586b4492e555efcc7b39ef24cc7a1844103cb. 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/DEA142226310.
Introduction et Variations sur l'Air, Op. 26: Que né suis je la fougère!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3036c5787fa475e2ace6d24f196acace42e1634e98fa843713edcd70ab58b197. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA142226302.
Deuxième Grande Sonate, Op. 25: III. Andantino grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f2ffc4c6bc8f5d488f1d3ccceebccb1af5f393fedfa0b70312dba0c514b006. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA142226304.
Mes Ennuis. Six Bagatelles, Op. 43: No. 2, Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91aee65cea3af2d98f64adca32e6bb75cb77c7e8b2820af6d266223d670808e6. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEA142226307.
Mes Ennuis. Six Bagatelles, Op. 43: No. 3, Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a41481f04a865d7e5ea1b2700c3bd344b293e7ce44840b8294a3d6b8c6c739b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEA142226308.
Mes Ennuis. Six Bagatelles, Op. 43: No. 4, Mazurka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e09fd24798fe8b848566b5196c2f234745d03bdb2e6652c9d530871602cc1bc. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA142226309.
Mes Ennuis. Six Bagatelles, Op. 43: No. 6, Valse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a7adbc5ea11ad9a0878f9f7fc772c32f22ba7be6ebbcfef5b5f422f00ac428. 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/DEA142226311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852f248e0a517cbba93a505d6529314532b378f28b8fc2bf5d051fbc660f52d7. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEA142226312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68778579cb2462bf5062c226287039ed7c2fb3db45799b5a7152b07d89130127. 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/DEA141913104.
Estudio melódico para guitarra: 'Canto de Otoño
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84eeb773c49340c0d004017149dc4c89a62371334bf4b6ada2992ecc2765ab7e. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA141913101.
Variaciones sobre el estudio No. 19 para guitarra: Del Método de Aguado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c54f4da918ccc79ab7f9c88ed37017d77c1bcbe47c3b3b9c6b170df5cd58a11. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEA141913103.
Estudio No. 52 para guitarra: Copla de Seguidilla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70cd9e93982dea0017d15ec6b80be3d335508332fee506c402ed6c9c9765069. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA141913106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4112e4cd0deb6e0416ffac61515cd26afcc9d26f52b833e82fcb136b8e3bfde. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEA141913107.
Villa-Lobos: Complete Solo Works for Guitar
Castelnuovo-Tedesco: 24 Caprichos de Goya para Guitara, Op. 195
Ponce & José & Castelnuovo-Tedesco: Sonatas 1923-34
Bach: Sonatas and Partitas, BWV 1001-1006 (Arranged for Guitar)
Bach: 3 Sonaten für Violine Solo arr. für Gitarre