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 0xbf40b131b7272e255db6e53c6bc158a0e8a92d8631b190f7a3b8af20f03c69e7. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e2845cc8-727c-45e5-945a-880bff4fa33d.json and https://artists.proofprofile.net/proofs/artist/e2845cc8-727c-45e5-945a-880bff4fa33d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Manoel Dias de Oliveira: Sacred Music from 18th Century Brasil, Vol. II
Tractus para Missa dos Pré-santificados: I. Domine, audivi
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 0xf759996d4c162dda0bd220f1dd651ce56a094a2bf63476818856b399b34ff060. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/USA371611199 — a six-check JSON result.
Tractus para Missa dos Pré-santificados: II. Eripe me, Domine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bbd4f2262cc72184fbf0bb447c3a958944670aa6847e3f52015d70f062fb07. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371611200 — a six-check JSON result.
Te Deum laudamus: V. Te Prophetarum - Te Martirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975304e119c09ad721a0b622e46a64ee58a149639958b218c21003f8198db616. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USA371611205 — a six-check JSON result.
Encomendação das Almas: III. Senhor Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6afaeb87f7fe9b36aad36b4bf24f2ec6abb0e2ca698d9b3dea40737baaac47. 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/USA371611217 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7008364710eb52cec36fe90df1211eeefa3f828b749b117813c27585412a5b22. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371611221 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11031e9180d8f8a123b633f76bdfbfa1d6494a6b3df1280825efafae09fe2b86. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USA371611222 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2292624c1d8c74d8e55ca517c1c91f0cc0672789531cdddd4b26bc3bded81ce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371611226 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b129c05c54f2bf674576e646ce64c37f5067c3e379836c83299958c59c714c7. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/USA371611227 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6683ceb2a01efafdd0184c8f43a778434289a40a55ccf77529ceb68f81ba40f. 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/USA371611228 — a six-check JSON result.
Garcia: Missa pastoril para a noite de Natal
Missa pastoril para a noite de Natal: Kyrie eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda310bac65f2fff83b2309d6733563b2c4af95ddb3caf31c38770165d013deb6. 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/USB8U1700606 — a six-check JSON result.
Missa pastoril para a noite de Natal: Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d06290465161380ce1faf3529d6c1145d6b1bb5c81d429b165ab79e85d5423. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USB8U1700607 — a six-check JSON result.
Missa pastoril para a noite de Natal: Laudamus te
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfb14289353f1bd491818dd59a897af3370af3a3b660450b19a1b80a2218cbf. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/USB8U1700608 — a six-check JSON result.
Missa pastoril para a noite de Natal: Gratias agimus tibi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1261bf4ef4d1979a8d8a9ac7480a810c611ee6993a3d15e474313e13ed152c. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USB8U1700609 — a six-check JSON result.
Missa pastoril para a noite de Natal: Qui tollis peccata mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9641b85f3950bb860ad8ca511db9e29225cbeeee9f871f57efa159ef9d0c5cd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1700610 — a six-check JSON result.
Missa pastoril para a noite de Natal: Qui sedes ad dexteram Patris
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef0be53d2ba1ff11b6608b377efaac11f7353c81096ed894e23201d101ecb77. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1700611 — a six-check JSON result.
Missa pastoril para a noite de Natal: Cum Sancto Spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e1ea1716325297d650ce2161925e8575a4fa2101c1c537fa20ae8c1523a833. 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/USB8U1700612 — a six-check JSON result.
Missa pastoril para a noite de Natal: Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7001663ac48da6f7849749d2549b9cf4977ff0ae8319b73993109a0a1dbd3d06. 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/USB8U1700613 — a six-check JSON result.
Missa pastoril para a noite de Natal: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda269e8b985d3a95e63144ae18f35f384fc3df8434e8fb20cc9249d37947781. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USB8U1700614 — a six-check JSON result.
Missa pastoril para a noite de Natal: Crucifixus etiam pro nobis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f2b33d88e6efcb66c3d6a7bc735733fbb2b4247221eb456fd8abed8360980f. 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/USB8U1700615 — a six-check JSON result.
Missa pastoril para a noite de Natal: Et resurrexit tertia die
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc392830106a1e4d769d3e62d0f414fba1b224bab3f2cbcec8f8cd502228dd5a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1700616 — a six-check JSON result.
Missa pastoril para a noite de Natal: Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c96bbe869b96002c91b3bcc15f9635c54cff345f85f3507ac2671f84b0b170. 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/USB8U1700617 — a six-check JSON result.
Missa pastoril para a noite de Natal: Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9ee825ab99d73e7d304e72f7f295806548e883f8bee1c72126e01785188bda. 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/USB8U1700618 — a six-check JSON result.
Missa pastoril para a noite de Natal: Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b291995f7ef37a797222b44dba36ca93fa33387fd05a187dbe28c585d5f2497. 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/USB8U1700619 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05b0e35c59a5f15c4a342a2e07fd42b8dad4a2ea604e42abc2bc908e75d63d6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1700620 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb47df6ee1a6b54b48f9ddc162a69eb125a1db9491ef232e2468da0eb401f344. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1700621 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce17fd471d6af7b482592793e3a363279f7012e127536a242fb03b2b7fb7c09. 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/USB8U1700622 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b1233a75cf84b98ac87c59d07da41fa157926354ea1f15b7609f0bc51a3bb0. 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/USB8U1700623 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009453e66ee299e5f3f51e08a06108e87898d2dbbc687d807fa5438c91cc9eb1. 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/USB8U1700624 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef77620aaa4d1e6f7a27221aee00ef219bf505d928415ead4c45ae2fdc11ff4f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1700625 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde2dbc70f3c67e8ee84e432987eedd03774f76f014ec6c2f721bdfbf763902b. 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/USA560679870 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da44b4168195bbe2bdc416e5f49d0528bc7cf88d803ca8ab8b1c2827c62919d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USA560679878 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee9dc173f84ff49ebe07e7571724bae1f3a0a8e55bcbb426301fe4fd573a1d0. 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/CH1499407701 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59bf9345f1954ed3ca8dfe09a5fcde7bc83873253d2e30936d06bb7ac5a93a7. 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/CH1499407702 — a six-check JSON result.
Cunha: Responsorios para o oficio de Sexta-ferira Santa