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 0x791dffb1515b750b36d4257a5b37dd33ccd8e93d34325b5cf032f9394d20bade. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d410d2cb-41ec-45b7-a7bc-e3536e60c724.json and https://artists.proofprofile.net/proofs/artist/d410d2cb-41ec-45b7-a7bc-e3536e60c724.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Jerúsalem: Responsorio Segundo de S. S. José
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 0x99c6c6669f1b2bf2b21779e0758cb87631a1fcf06bead747de0fbc583d84762b. 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/DEA809460001 — a six-check JSON result.
Jerúsalem : Dixit Dominus : III Judicabit in nationibus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0269696879dce0f18da7b52b67f85099d56adb764d5620dff1804d8add652f. 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/DEA809460004 — a six-check JSON result.
Jerúsalem : Dixit Dominus : V Gloria Patri, et Filio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39949d426bc2be850ecc25158bca6b02dab910ab2e2a18afd31251717e699032. 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/DEA809460006 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361b939f4984572a742beeefa1d80b6c652df0b2c66a93e4f9d8b0ef0057c045. 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/DEA809460008 — a six-check JSON result.
Jerusalem: Mass in D Major "Polychoral": XI. Et resurrexit tertia die
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9089485d453f548239533dbc1fdbef43e098fb64ee2e998f3e0f8cd24a39922. 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/DEA809460019 — a six-check JSON result.
Sumaya : Hieremiae Prophetae Lamentationes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a3af77ace56fabc732e83c3ad1e57b7eb37945ed87b0d94cfbf542d4d88220. 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/DEA809460021 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d69fba43f93e2835394c3a1cff5381721df27f639ed3264507889ac1843195. 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/DEA809460022 — a six-check JSON result.
Jerúsalem : Matins for the Virgin of Guadalupe 1764 (DAW 50)
Jerúsalem : Matins for the Virgin of Guadalupe : Invitatorio y Salmo 94
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd781dcb375b85e8be3a01bfcbcec0465f4fb55d7ccfe4f7c8b3dd1772fce0bf2. 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/DEA809703801 — a six-check JSON result.
Jerúsalem : Matins for the Virgin of Guadalupe : Hymn - Quem terra pontus sidera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c31fc3f93405009239698e80063dab60e7b04d040fac18a3c011a5d86620fad. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/DEA809703802 — a six-check JSON result.
Jerúsalem : Matins for the Virgin of Guadalupe : Responsorio - Vidi speciosam sicut columbam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a42db7881a0e800f96abb808936f01421894e354194fdd41553aaf7cd0c23f2. 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/DEA809703804 — a six-check JSON result.
Jerúsalem : Matins for the Virgin of Guadalupe : Responsorio - Quae est ista, quae ascendit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258186f5536bd4c8f1bac40d384d758c4e8ba3e508cbf61eab26a6ef8dffa1ef. 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/DEA809703805 — a six-check JSON result.
Jerúsalem : Matins for the Virgin of Guadalupe : Responsorio - Quae est ista, quae processit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa946424d2a71a2abef9520bd8edd5d1c9c90a2eb45cc9b2ef7468879945e51c7. 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/DEA809703807 — a six-check JSON result.
Sumaya : Matins for the Virgin of Guadalupe : Interludio - Albricias mortales
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496ab419dda468d6cbea9063ef46349ffc91bcdebd49c7d106da0ac4b0357b39. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEA809703808 — a six-check JSON result.
Jerúsalem : Matins for the Virgin of Guadalupe : Responsorio - Signum magnum apparuit in caelo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1884247f81c9c08e28b186a6143618159b0e5f1946bf32f465b0a41cd27eed93. 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/DEA809703810 — a six-check JSON result.
Jerúsalem : Matins for the Virgin of Guadalupe : Te Deum - I Te deum laudamus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da037f2fee1bc062df9f7076e0a0bf93418baf33a244e6c8e8b2fdf8122f1b8. 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/DEA809703814 — a six-check JSON result.
Jerúsalem : Matins for the Virgin of Guadalupe : Te Deum - VIII Aeterna fac cum sanctis tuis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bafc56a984b56d18ce7cb1e573f6d02a2e122ce19d70918c0677389038a3aa8. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/DEA809703821 — a six-check JSON result.
Sumaya : Matins for the Virgin of Guadalupe : Recesional - Angélicas milicias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbf958428c785665005367f06737e839c01f5e71d97f2ef4990448fe8be585b. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/DEA809703823 — a six-check JSON result.