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 0x6186652754505c94916606aaaaa1a2cc28bf03f99dda2f28f8b4529d5d59b939. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1a3a300-3dab-4607-99b9-92f2ffcfee7a.json and https://artists.proofprofile.net/proofs/artist/f1a3a300-3dab-4607-99b9-92f2ffcfee7a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x42c50502683fec14f906dcf7134b7ab14e50a9bdb3631a58647ba15e3bafee08. 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/FRZ139310560 — a six-check JSON result.
Doña Francisquita: Romanza "Por el Humo Se Sabe"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81fe5b3ebe01ba4517476ca4f3660c8dba93c52481fe1cfe08bdc39d5d19395. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRZ139310490 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf28a348205c66565570487b4b249c598d0aec5547390793aec8fc4b2a36b7e0. 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/FRZ139310450 — a six-check JSON result.
Coro Polifonico De La Universidad De La Laguna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00df93a5d3231e67bd091768b03d21ae492b7a3f770f63697fed8d738959c3eb. 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/FRZ139310530 — a six-check JSON result.
La Tabernera del Puerto: Romanza de Leandro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1685a46172d8c89c37afdad8ef44e7a11d388f312200e8aaff7af0c453085430. 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/FRZ139500240 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcfe1c2799265a22170479bbabff659540488b8ac8b2ac9255003f513468578. 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/FRZ139311386 — a six-check JSON result.
Coral "reyes Bartlet" De Puerto De La Cruz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acfc67ea736f7aaf52025db45080493636646144883f3f58ec0919269b554f8. 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/FRZ139311384 — a six-check JSON result.
La Verbena de la Paloma: Coplas de Don Hilarión
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935ab12e815b271070ed81e0be4e1d51dea617e95c8dd11bb3a67aa835f89323. 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/FRZ139410310 — a six-check JSON result.
La Verbena de la Paloma: Habanera Concertante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b8e40603d07a4eff75d9c78d9020d50a7cee60d30ba78d3932884dc9134dfb. 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/FRZ139410380 — a six-check JSON result.
El Barberillo de Lavapies: Jota de los Estudiantes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1b0252bf98d1223592bad4f87614dc453630aec0305ac8c679df7c953f19e5. 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/FRZ139410880 — a six-check JSON result.
El Barberillo de Lavapies: Entrada de Paloma
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86498ca0a106320e88fb3eb5346ea7f766d226de8c5fe4630871eafafbae5fe5. 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/FRZ139410850 — a six-check JSON result.
El Barberillo de Lavapies: Seguidillas Manchegas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1391f8705ab96a6b92dc450bd69f17c8a34b0652e205d6a9f5679c32c5107939. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRZ139410920 — a six-check JSON result.
Luisa Fernanda: Vidal y Coro de Vareadores
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731b4380ecb5fedf05f57afd9a43fa3f45a5344094edf10d65912566240925fe. 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/FRZ139500592 — a six-check JSON result.
Luisa Fernanda: Duo de Carolina y Javier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df0bdb2e2ea9d2d8ad7b047e153891e5e1fcdeeb3bbb87852f8c6ac5b43b964. 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/FRZ139500555 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5f508e9c848bd04a0d4617483699a46cec794d48e7449764f93f8195a11d4f. 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/FRZ139500553 — a six-check JSON result.
Luisa Fernanda: Duo de Luisa Fernanda y Javier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a29b615abc361a8da5cffff0c3b3118608815ad40c241d87d7f0b8e3a13e938. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRZ139500593 — a six-check JSON result.
Luisa Fernanda: Mazurka de las Sombrillas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5739232dfc371113852bc13b3a26e923ba13c86448f00515185f17c2a046d9a. 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/FRZ139500564 — a six-check JSON result.