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 0x9ca40c6d3795245f62a3d9137500d87a142f7eb838e804a636382e6c02377a07. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45f0f008-ea1a-4935-8508-c798fa638f7c.json and https://artists.proofprofile.net/proofs/artist/45f0f008-ea1a-4935-8508-c798fa638f7c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
String Trio in G Major, Op. 34 No. 2, G. 102: I. Allegretto comodo assai
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 0xd2b9f4321227c0996faacf1692a3476a3d78cb0be95f9841d441b00f6e7275a8. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899400301 — a six-check JSON result.
String Trio in G Major, Op. 34 No. 2, G. 102: II. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75849046c6332e84ddacbc22042699e8c4188da418c175c2703bc2cde0c5946a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899400302 — a six-check JSON result.
String Trio in G Major, Op. 34 No. 2, G. 102: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65622fafc48d06d1118ee6efd13478eb7fe6e82fff24c5320721de1ccd612c7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899400303 — a six-check JSON result.
String Trio in G Major, Op. 34 No. 2, G. 102: IV. Rondo. Allegro man non presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec11de4b016c51e52ef4f028899acd4873ec1613f14e4949445bd526bfa29adf. 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/ES7899400304 — a six-check JSON result.
String Trio in G Minor, Op. 6 No. 5, G. 93: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9c51089decf11131983f22e0c365861e629a0c27a1359421160284d5dab7c3. 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/ES7899400305 — a six-check JSON result.
String Trio in G Minor, Op. 6 No. 5, G. 93: II. Rondo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935c3662515db4d27f217640b60e6101eedf6ad81c8609a35ee4eed7484ae909. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899400306 — a six-check JSON result.
Violin Duet in E-Flat Major, G. 62 "La bona notte": II. Rondo. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f84135d5cfeb40854f95088192a70ad75e147ebddfea83ec2a204ed62af3e9. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/ES7899400309 — a six-check JSON result.
String Trio in D Major, Op. 14 No. 4, G. 98: I. Allegro giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a4f1edee3dd828288ca7a5c7c72eb3e8daa9a9615f5962daa6f11aba06d3f9. 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/ES7899400312 — a six-check JSON result.
String Trio in D Major, Op. 14 No. 4, G. 98: II. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772e266405bdc533b9bad9f46e2a20bed5c04bda789709c0f0d23c683629645d. 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/ES7899400313 — a six-check JSON result.
2 Coplas castizas: No. 2, El dulce de América
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38aa0b75f4ce0a2358531c674354d8c094bb6b7c7b5780053f0d55387458a6c2. 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/ES7899901002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00964583f934d4a169acd4a46d7b3774803dfb50fe12508bdf7e1d72bade7c52. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899901004 — a six-check JSON result.
Tientos y batallas: 17th-Century Violin Music in Spain
Guitar Quintet No. 7 in E Minor, G. 451: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a95179a6f8b3c6df9f5d13eeaaceec0397bd9290cf99f6ad66826bd3a9a3a1c. 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/ES7891401801 — a six-check JSON result.
Guitar Quintet No. 7 in E Minor, G. 451: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977b7d86fc73648ec83abc76bb0d0cdf3024b7b9557b085ce7d88a383484b4bc. 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/ES7891401802 — a six-check JSON result.
Guitar Quintet No. 7 in E Minor, G. 451: III. Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38524651e985e702b5aff785faedb4a291a948492d13110fb8a7db8747af5b6f. 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/ES7891401803 — a six-check JSON result.
Guitar Quintet No. 7 in E Minor, G. 451: IV. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66452929a1241f76938ad537d62c66061e3f944d4d1316a81aa8ade792f604bd. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ES7891401804 — a six-check JSON result.
Guitar Quintet No. 4 in D Major, G. 448: I. Pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d315dc06aaccd6f94aab0125308382e03f2df8c773547af20f8782b89d6084c. 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/ES7891401805 — a six-check JSON result.
Guitar Quintet No. 4 in D Major, G. 448: II. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c2bf7678b3c98be74bfb4cb6a6360b5f36ac852446088a228a5c6a0a11b28a. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES7891401806 — a six-check JSON result.
Guitar Quintet No. 4 in D Major, G. 448: III. Grave assai - IV. Fandango
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27df6e44ee36382cae262617f6f81c9caf8b1b06f9c027bb07b3a96d3aa681b. 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/ES7891401807 — a six-check JSON result.
6 Quartets for Harpsichord, Violin, Viola and Cello, G. 259: No. 3 in E-Flat Major: II. Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323c38f7cfbf56245eb6cefce1b9b40825d274ba0bdfd40b02fe5b76b59951e2. 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/ES7891201406 — a six-check JSON result.
Boccherini, L.: String Trios - Op. 14, Nos. 1-6 (La Real Camera)
Boccherini, L.: String Trios, Op. 52, Nos. 2, 4, 5 and 6 (La Real Camara)
Jones: 8 Setts of Lessons for the Harpsichord