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 0x44b69d56585fa1861b89a6669bd3fb62892c926384af0d4e0ee717db54097104. 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/1a2c90b9-1b02-4902-9f40-455ba108dbd7.json and https://artists.proofprofile.net/proofs/artist/1a2c90b9-1b02-4902-9f40-455ba108dbd7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Rodrigo: Concierto de Aranjuez: I. Allegro con spirito
Orchestre National Du Capitole De Toulouse
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 0x0250928ab7e69f749ece0b91244af4863fd0dc547291eaa3cf4c71bb45d0fd90. 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/GBAYC2001928 — a six-check JSON result.
Rodrigo: Concierto de Aranjuez: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2433db6499f8f9981198b57d9717e702c1c88465d16b29303643f4b683c70295. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAYC2001929 — a six-check JSON result.
Rodrigo: Concierto de Aranjuez: III. Allegro gentile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cca82e76541f98726d624a9e0037da7255d120ab4295ecd34ff6d630b5b3dc. 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/GBAYC2001930 — a six-check JSON result.
Sainz de la Maza: La frontera de Dios: V. Sacrificio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdd6cbb00120e69557e0c273b0a2e578e9b73d4cd1a6abc446234eca4b9c153. 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/GBAYC2001942 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86367d64cd24aed6d098d1c225b85d85bba03176044ba5845f96858e0849fde. 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/GBAYC2001939 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9a55d4df976e5d919d34e06970e45f81b0364b6892933e9e16c86df93ccf8d. 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/GBAYC2001940 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1d9bce0010cd554cf2601bcaf86e0ea89a4f045a8b3ff0472eeb08fba20a22. 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/GBAYC2001941 — a six-check JSON result.
Tansman: Musique de cour d'après Robert de Visée: I. Entrée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32909b8868124d75bd9eb30eb220af5c78d2231a02ff89aef80d30479c3540f2. 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/GBAYC2001931 — a six-check JSON result.
Tansman: Musique de cour d'après Robert de Visée: II. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2388d9d73d74bce6e4e87f57f131dee2d729260ab970de3a2a0b7a494ee2cd7e. 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/GBAYC2001932 — a six-check JSON result.
Tansman: Musique de cour d'après Robert de Visée: III. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ad4f891b4a8cd183f5d3bac4f0108fececd8c21336bacc1d6491c94f97046b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBAYC2001933 — a six-check JSON result.
Tansman: Musique de cour d'après Robert de Visée: IV. Gavotte et Musette
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad4920ecf455822a2cd0fd5fe2d68f2bc7fcdbfd8d3bbf0cb6d0df631dcd94f. 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/GBAYC2001934 — a six-check JSON result.
Tansman: Musique de cour d'après Robert de Visée: V. Passacaille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fa1ead6940d0fc6cc2021dade3f63278b77f4a3ea9d8997c69b78e9d6c45cd. 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/GBAYC2001935 — a six-check JSON result.
Tansman: Musique de cour d'après Robert de Visée: VI. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348eae2294001729bebf32dc2c3ca500545211081ae16ab6e54cbf4e7f0ef07f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBAYC2001936 — a six-check JSON result.
Tansman: Musique de cour d'après Robert de Visée: VII. Air
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcbc131e98f0adde494df4dbabbadaafbd73212f4f95d5cd7c2b40134b69dfc. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBAYC2001937 — a six-check JSON result.
Tansman: Musique de cour d'après Robert de Visée: VIII. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db1d11138784d468be0a7a40299305e793688c938a03cd3067dc548ab23a107. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBAYC2001938 — a six-check JSON result.
De Visée / Transcr. Garcia: Pèces de théorbe et de luth, Suite en la mineur: I. Prélude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f589bd6c42445776dddb5d0274a46ab46f57f75ac0859a15e88ea32781bbe98. 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/GBAYC2001973 — a six-check JSON result.
De Visée / Transcr. Garcia: Pièces de théorbe et de luth, Suite en la mineur: II. Allemande grave "Tombeau du vieux Gallot"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9373751407f6c2f0ada453a0e437572dc2a013f79388aeccf1e980dc7e50c916. 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/GBAYC2001943 — a six-check JSON result.
De Visée / Transcr. Garcia: Pièces de théorbe et de luth, Suite en la mineur: III. Courante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6848ed37ce8948bdaf0b94f7088e1846cafc416c8b421b7cc03fee28c243085d. 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/GBAYC2001974 — a six-check JSON result.
De Visée: Pièces de théorbe et de luth, Suite en la mineur: IV. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83c020a9f469c50be2347bf3cd1623844941d2c6a1f2a7b4c550789717c9f45. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBAYC2001975 — a six-check JSON result.
De Visée: Pièces de théorbe et de luth, Suite en la mineur: V. Rondeau "La Montfermeil"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b073f6ed342d0168a997c3d93fde5c14a9b27ff256ef3d88c3edfbf86b4575. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBAYC2001976 — a six-check JSON result.
De Visée / Transcr. Garcia: Pièces de théorbe et de luth, Suite en la mineur: VI. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5233cd261d0b88f4bd5c5d249a64224175a2f00ac65234e5c16d55e10959b81c. 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/GBAYC2001977 — a six-check JSON result.
Piazzolla: Estaciones porteñas: IV. Invierno porteño (Arr. Assad for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e59b4b8625725ba246dbfa7dd3c564dc6a9483cc4d4c80594f9d3af88406dff. 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/GBAYC1600493 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afe48c16e12215ceea3699bf931ab1e084b0ae293ee50b2f496e617cb56db75. 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/GBAYC1902538 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa7f9c2a3914ab3a0663a7eeb16b323ef38475d25580c2d48868bbb5ebb7433. 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/GBAYC1901101 — a six-check JSON result.