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 0xb2763b3d6256778ea6529ab5ff71edb895ad80ffd7b1e5ff6c535be181173b09. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b71d9ae-4438-41a1-a6a5-9250b24ccf46.json and https://artists.proofprofile.net/proofs/artist/5b71d9ae-4438-41a1-a6a5-9250b24ccf46.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
66 / Presentación: 1974 - Poemas a Manuel (A los 20 deambulando entre Madrid y Estocolmo)
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 0x07c4037996db81d635be16ea5a2abdb06ef988c454b94868b47cb519beb1ec8a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GX53U2094593 — a six-check JSON result.
66 / Act 2 - Casado con hijos: 1997 - Amor para siempre, Amor (Ella dijo me voy y yo escribí esta canción)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ecfca91929eeaf57862b4082fa366f525bcc5fac14ec4ecbf7259118c82dd5. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/GX53U2094594 — a six-check JSON result.
66 / Act 2 - Casado con hijos: 1998 - Ven
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b76054855dc4ea30be4a1d7c3089545b1fee9fc7b32642b3595be9a0163586. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GX53U2094595 — a six-check JSON result.
66 / Act 2 - Casado con hijos: 1999 - Al final
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658a024f7716ce4dda21a6e1b43f91e85349743bcb538c48ce5438978a9469aa. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GX53U2094596 — a six-check JSON result.
66 / Act 2 - Casado con hijos: 2007 - Un hombre común
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4100743d3ec9f9879a07721e181764b32a015d46fdcd904c0b8e309c61837c50. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GX53U2094597 — a six-check JSON result.
66 / Act 3 - Volver a empezar: 2015 - Canción de Ale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6f08535274c67cac97dc1b007559ce20cf3df200145fe2ed566eff008ef1de. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GX53U2094598 — a six-check JSON result.
66 / Act 3 - Volver a empezar: 2016 - Don Rating
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630cfb5d8d23ec6530d7d0613685f804192cc3e444e0285b97a6d11fdace3e76. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/GX53U2094599 — a six-check JSON result.
66 / Act 3 - Volver a empezar: 2016 - Oda al celular
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9b9992cf9911c6040782624e72a3caa4f2054684e4695577b761243aed062e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/GX53U2094600 — a six-check JSON result.
66 / Act 3 - Volver a empezar: 2016 - Rey de la nada
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c9c8dfe2517b93374a3d87fb58577f1fff0e81f2b42d12a97f1b42cefc19ff. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/GX53U2094601 — a six-check JSON result.
66 / Act 3 - Volver a empezar: 2016 - Vienen y van (Para Victor y Claudia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d8b70f02850b6e2efee0c7ce9752439bdc4bdf166192b849810f317788ad74. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GX53U2094602 — a six-check JSON result.
66 / Act 4 - Como será: 2019 - Happy birthday
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb482d805c422969052b045b91db4ecf2fd474916bd4cf44c5c626dcf157ea0d0. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/GX53U2094603 — a six-check JSON result.
66 / Act 4 - Como será: 2020 - ¿ Cómo será ? (Mi canción en pandemia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4a0e00104a26f72380fa5ea042b9e26c78db2e37d12a903ad28516c8c7afc. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GX53U2094604 — a six-check JSON result.
66 / Act 4 - Como será: 2020 - Un canto a Lucía (Para mi nieta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad739eb1b39f092785058b8601876c51b286a9c34c333e5bf9c088c645add231. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/GX53U2094605 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e0cc4f0754f4a9cee78f14981ea13c225f7f5f9948407f10ed2a139bf594c4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GX53U2094606 — a six-check JSON result.
66 / Despedida: 2021 - Eres amor - Version Vals
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a89574b8b24fbfc561a0e9916b57a3ec18a3f37f75b8c56293793493f778397. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/GX53U2094607 — a six-check JSON result.
66 / Despedida: 2021 - Eres amor - Versión Salsa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf283fc586cec45410044951ec6ec70cc9df13fd0579878bcef139646f773e508. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/GX53U2094608 — a six-check JSON result.
66 / Despedida: 2021 - You Are The Love - Versión Blues
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd639e116fdfabb4afc6c185393bd2c87339c4d047a4426d6a591ce84ec60eee5. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/GX53U2094609 — a six-check JSON result.