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 0x86150ad27365a17b9d122ea3ace3b94883696639a47a6f5ca0ec97098864934c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6fac330b-aa54-483b-b306-b07b3b6f51f9.json and https://artists.proofprofile.net/proofs/artist/6fac330b-aa54-483b-b306-b07b3b6f51f9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sonata a Violoncello Solo in G Major: I. Largo
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 0x46ed97d926c071cd47ba53e3eb99b312ffd1f3e945709eed10acafb21e037cc0. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/SKB260513201 — a six-check JSON result.
Sonata a Violoncello Solo in G Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb505e5f2d1fb10b5bfbe3a6aff9e4d1e9dbee4072d6a56c3e925d96cf8541332. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/SKB260513202 — a six-check JSON result.
Sonata a Violoncello Solo in G Major: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22bbfc477af6877723e586ff60862136314ee3757bd2cee3ccc79d8a37289ad. 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/SKB260513203 — a six-check JSON result.
Sonata a Violoncello Solo in G Major: IV. Sarabanda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e774ca16e761402b153a46aa7db949367afdf3b6cefb4798533a43f883fc01. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/SKB260513204 — a six-check JSON result.
Sinfonia per camera in C Minor: I. Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe7d7005f306852f9a80dce6df0a44fdceb209df63b221106dec86bc8de7227. 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/SKB260513205 — a six-check JSON result.
Sinfonia per camera in C Minor: II. Spiritoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71fff0283b2f29ae8b5da9d66de82076273f899fde77e37e43b028e1bbd49656. 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/SKB260513206 — a six-check JSON result.
Sinfonia per camera in C Minor: III. Affetuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd728586e26a1d80a102cd906e911b452024107930c4b29004a0c3009a26aff2d. 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/SKB260513207 — a six-check JSON result.
Sinfonia à Violoncello Solo in D Major: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21de2d1d7f9a3d5c324c998ab0a1791cd829204da4a190c34b23352eb60b835b. 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/SKB260513208 — a six-check JSON result.
Sinfonia à Violoncello Solo in D Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e39dd122d5477a6e127112bc196633b5f07f5c1f2db33c26ea754958f218206. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/SKB260513209 — a six-check JSON result.
Sinfonia à Violoncello Solo in D Major: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91117faa748885d699fe0da163ec36b31c067fdd0544b35a839e42787964013. 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/SKB260513210 — a six-check JSON result.
Sinfonia à Violoncello Solo in D Major: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a6255b0c98aaca840ea3a0078967a87ef38bbe797e9167dbcd10a537f3c51d. 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/SKB260513211 — a six-check JSON result.
Sonata for Violoncello and Basso continuo no. 4 in D Minor: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaca5c6e3801b8bde48d7dc692ac3001a04f49ea42b74b372c799ef21752bf53. 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/SKB260513212 — a six-check JSON result.
Sonata for Violoncello and Basso continuo no. 4 in D Minor: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679377264d00cf9aa0cf9dd35375f769b5a785465fae2940e9d7199737ac5fb4. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SKB260513213 — a six-check JSON result.
Sonata for Violoncello and Basso continuo no. 4 in D Minor: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5b4f28990153def49d20d8e3a85bf4a1ca78a98620b71c200ebc3d0e954722. 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/SKB260513214 — a six-check JSON result.
Sonata for Violoncello and Basso continuo in F Major: I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1dfba675b9957a45f7bb772558cffaf7d6c18bae36da253102ee33e0bbaff44. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/SKB260513215 — a six-check JSON result.
Sonata for Violoncello and Basso continuo in F Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5495022c0953fb788e7bcf1c50d8d95107d4e37311521ca71e45bd3a62f470a. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/SKB260513216 — a six-check JSON result.
Sonata for Violoncello and Basso continuo in F Major: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eecd7da5a794e2906f27a99d501a139be4f955b6f3ff4532b491380cbb2561b. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/SKB260513217 — a six-check JSON result.
Sonata for Violoncello and Basso continuo in F Major: IV. Allegro non presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e4d6df694ff826157468873089d8e37bf100ee45201b75a152f682a1f0db31. 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/SKB260513218 — a six-check JSON result.
Sonata for Violoncello and Basso continuo in A Minor, RV 44: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638f83164abb70fd4ee7dc7def9bcfccc9a25f458d880ef1b11195dd1b703dec. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/SKB260513219 — a six-check JSON result.
Sonata for Violoncello and Basso continuo in A Minor, RV 44: II. Allegro poco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3b7d73429d6d19e033460dc34f4c2bda9c5cab3b4d973599776164e958d872. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SKB260513220 — a six-check JSON result.
Sonata for Violoncello and Basso continuo in A Minor, RV 44: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cd9a5a08afde9efaa35908d9fb2928c99282bd6108bcbe79d2fc698455ff4b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SKB260513221 — a six-check JSON result.
Sonata for Violoncello and Basso continuo in A Minor, RV 44: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e92912c433cfa698ac42b8ef99e5c7884200753b0c3f2cdcc681b7c6bca0e8. 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/SKB260513222 — a six-check JSON result.
Sinfonia di Violoncello a Solo in C Major: I. Amoroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893cf35fbeaa2c2305ac92f398d2f1a7bfa2393e0dca78dd6f7ebb934446974c. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/SKB260513223 — a six-check JSON result.
Sinfonia di Violoncello a Solo in C Major: II. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426554665dc820454bafece4b4ac5c48ba92b5902ab776b36e996f0c1c0216ba. 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/SKB260513224 — a six-check JSON result.
Sinfonia di Violoncello a Solo in C Major: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49fa05c35530cf409fbec323f4975370a7adb9616f969dad53f09d855d8b5bb9. 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/SKB260513225 — a six-check JSON result.
Sinfonia di Violoncello a Solo in C Major: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4309e509a839d498343bcf75c607c5d0c4213b29c38f698512288d6b886ee1f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/SKB260513226 — a six-check JSON result.
Sonata a Violoncello e Basso in D Major: I. Amoroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2f64f51f86bc446cc67e68a4de3bc8a9501110362bc17783975027e31a0c56. 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/SKB260513227 — a six-check JSON result.
Sonata a Violoncello e Basso in D Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e821d0a85d96e892fdf905d05278c7bf2e464604a3fff75f86698808994bbb. 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/SKB260513228 — a six-check JSON result.
Sonata a Violoncello e Basso in D Major: III. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9d378e40310c059535061f2f26f12d66618f581eacc3bccba37ed1dd472546. 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/SKB260513229 — a six-check JSON result.
Sonata a Violoncello e Basso in G Major: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01fad37fe7f9c133831415e1fbca3b9b7f83464d8690a1432b1e0dc25657cf1. 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/SKB260513230 — a six-check JSON result.
Sonata a Violoncello e Basso in G Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9c9f49f702596aec71d590894e95e862f84e964da606042b9100fb1b49114d. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/SKB260513231 — a six-check JSON result.
Sonata a Violoncello e Basso in G Major: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22da6c1d07d9d61ab3aa5ce3157b286cd8880b50898f659484b71e8239780b39. 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/SKB260513232 — a six-check JSON result.
Sonata a Violoncello e Basso in G Major: VI. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14627ee916aa9dcd26d6fcfca0c1c22c6bb09625a42c95397d5824ee8bf4010e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SKB260513233 — a six-check JSON result.
Concerto per la Camera à 4 con due Violini, violoncello concerto in A Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c6a2729e583684de5eebf8ca15a2110221e6428759f2021d2600eb69427370. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SKB260513909 — a six-check JSON result.