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 0x7e0d251f3f6fe8d86ae6ccb37b0f142124da1642828ca0caf1219fab708169e6. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d52b6f58-fadf-4bd8-ac1f-16ee560d5cef.json and https://artists.proofprofile.net/proofs/artist/d52b6f58-fadf-4bd8-ac1f-16ee560d5cef.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Las Golondrinas, Preludio y escena 1ª, I parte: "Aquí tiene usted la peluca"
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 0xbf70b8a94c37c26070cf623368e00cd71aced7ac9df15c0451754895cb5a27c5. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ES5279903901 — a six-check JSON result.
Las Golondrinas, Escena 1ª, II parte: "Niña loca"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd833c54f8638cf72daee496f4130a1797ce7207b35c239cecd90164e2d675e7f. 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/ES5279903902 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58ccab1cbb9e39d324cdd96613bea4182cf31d10f8c67f88af37032952db91a. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ES5279903903 — a six-check JSON result.
Las Golondrinas, Escena 3ª, I parte: "Es de noche"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48915cf5d50dbc1848e9e1bb3a934ed3b8578676885e254eb0efcb8e005e2143. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ES5279903904 — a six-check JSON result.
Las Golondrinas, Escena 3ª, II parte: "Fuego de paja en el viento"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa659d07d93c46bbdade237728212291ee3ab01b2172f17ec98e1cb5a95a72df8. 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/ES5279903905 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61649e67b90e452088f3157a412f51d6bf73b83c2b2f80d9acf9a34040dbda1c. 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/ES5279903906 — a six-check JSON result.
Coros y Orquesta del Gran Teatro del Liceo de Barcelona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aae1953dbe1e8b30d7296a40cb8f4ae8a7bdfd80ca6fdd48cfd595cd0380ba9. 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/ES5279903907 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3414d2c1a18bf3a8319f277ff900fea230f7040a27979b2fc941bead7939d4. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ES5279903908 — a six-check JSON result.
Las Golondrinas: "Romanza de la primavera"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c5174fefdb6b5ae7a634d56909ad8d02dc0a13b07c85208ea48426931b8c14. 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/ES5279903909 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fbc46d25a2bd91eaae45832d0a53d41562eb00d959cc0c1e918b10d5298db3. 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/ES5279903910 — a six-check JSON result.
Orquesta del Gran Teatro del Liceo de Barcelona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac31e3e83f6151df66e7c2b7fa4fe64bc2ccab3e26d1a7b268a7db35f36aa5d. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/ES5279903911 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1d66def054841d4d23b9e145c381ee82100c376d154228355749c120bdd4dc. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ES5279903912 — a six-check JSON result.
Las Golondrinas, Final, I parte: "¡Qué linda es Colombina!"
Coro del Gran Teatro del Liceo de Barcelona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75c4c1c4ab9182233956aa85e53fabdbe6ccb858e5baca2e44a85fe09df1943. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ES5279903913 — a six-check JSON result.
Las Golondrinas, Final, II parte: "¡Oh, Puck, por ti mi corazón!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c4db325f44b167b4bd291406d4976fa5441ade5c37dcecf7233b9e1d4ae3d6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES5279903914 — a six-check JSON result.
Las Golondrinas, Final, III parte: "¡Quién se ríe así!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c25a0bd107f3e358dd45cc5c528c0640b53f3a39b8f7555d3b35e8a4fdb103. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES5279903915 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6349e5b7f01d14ef6070af5cbbcf13244d43c98810e1bdc6711ffed01c7979e3. 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/ES5279903916 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a01f26970c256cd53059224c61ffbe280baf0b280225848bdeecd6fb462f0cc. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES5279903917 — a six-check JSON result.
Las Golondrinas, Escena final, I parte: "¡Era mío!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a953c9839fa8c32f765dce2933a934dfb304cc6cb7189ad42b7d9f2f1b5198. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/ES5279903918 — a six-check JSON result.
Las Golondrinas, Escena final, II parte: "Se reía"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee86244184dc83d4008c37001cd01610d6e6368d78fc4245f6a8073ff1fc0dc. 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/ES5279903919 — a six-check JSON result.