thumb|right|Pico Turquino in the Sierra Maestra, Cuba's highest mountain. The Sierra Maestra is a mountain range that runs westward across the south of the old Oriente Province in southeast Cuba, ris
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 0xf806ff1c43c70f04161b292b75433963be711eb8ffcd55a4b905612fc1d4fb5f. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00bf19b6-5560-4044-a0c4-095843780c8f.json and https://artists.proofprofile.net/proofs/artist/00bf19b6-5560-4044-a0c4-095843780c8f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xd56b2754f2e77f69da562b10a795089941bfac7da4cf5f239a692a70f9080e08. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA560872666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f9d38ed99568de878f825f72904ac426385a78f3b394af30712529933956c0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBGU0641004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c38b048ca40d5a2e5d659d363d1a3453a21d2a8b8163a31d4893ee7c16f107. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBGU0641007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9808a31bf1d265573411c0927fd634ca5a5118be513574cf30fcfcb69758f0fb. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBGU0641010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56ea5f4d63348dc9cb7493df285b2c4aa5210cf00f7178eb964a10daf14ecc9. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBGU9751007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c904906bc6db255949f7d4efb7699bdc0e253d193c90a4365b2bf053ca30f2. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBGU9751008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ba9c8467d24116bef2beb8903a2aa9dffaa7043632f336bfcbd9c72bb01b36. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBGU9751009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4adeaa7eba61394b8e0892617969c9c9f1282f219ae88e404b28527f067c4b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBGU9751010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76acf4a6e5e17d2ee7e78887fef5d1c9190179c81fef469bf718e64bfdafdf55. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBDTM0227006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bf1d953018834fc8425fca93dc60fe526491c2f62517b5a5d490e009b07067. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBDTM0539002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91cd9ee63e0dda59df1bf6d440f749d331f43475e3e04c61ca1c0e19ff0ed3b4. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBDTM0539001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde99009115591b131fde78985acdbefb558847d310d6be5d540d75f0cd26d67c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBDTM0539007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f36de9c3673e8f89fe7750e68bce14826097875fea82af5243a6bba5486d84. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBDTM0539009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9004efdad1894aa0345f68728601e823a5aa03bf772c6974e291c08a0bec9070. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA012255422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4f0b474cda1004c70fe62358c72ab88e1e098d516a9db8e80f57f928f6705d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA012255424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e94d40b8ddba83269103d5c37c1c4c24ad666424788db0ff3499905021e66a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF171100886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9286e08a85fa5dfa7813c1f9febecbc54d3a2251b69c0a7b75ae903cf5a5d3d2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF171100895.
Suavecito (with Sierra Maestra) - Remasterizado
Celeste Mendoza Con Sierra Maestra (Remasterizado) (with Sierra Maestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde110cabbb626e9b243280dbe1c145b0a22aaede08a70583af68bf5ff3fb65be. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602483.
La Mujer de Antonio (with Sierra Maestra) - Remasterizado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d63633a2f70b03e7af005381e7fd2bd4691ad4f7f7b834a9bd3c380d7c858c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602484.
Veinte Años (with Sierra Maestra) - Remasterizado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b7fd9d32da444b056475aa9cc92d4732aa17c1bb7f3e0e545ae01873e82175. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602485.
Chencha la Gambá (with Sierra Maestra) - Remasterizado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c91bd2a8aad055e34fc5511e3c51427593af2855f5a9d99588270fb1b7ffc2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602487.
No Juegues Con los Santos (with Sierra Maestra) - Remasterizado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9cc742d06aabe72af5517d8f4d1408bf21de92c1e9d7ed0e4a2ea33c91f0d51. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602488.
Bardo (with Sierra Maestra) - Remasterizado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3400b50e70d237962e5882b4ce0c9b5f5a0d75e1b396f738c399f3e7db5cc49b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602489.
Échale Salsita (with Sierra Maestra) - Remasterizado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e76d2a5ad160df57045295c4820f432b8478f159c4d5b885771a7cf941cbce4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602490.
El Final No Llegará (with Sierra Maestra) - Remasterizado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf68309341f31e0e0bf2b620bafe3080f1a89363e312c92646ce095d98aa82f8. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602491.
Consuélate Como Yo (with Sierra Maestra) - Remasterizado
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942732f5cd83ca44447d0479e3f624bff9036088683945fefa7b9d6e2f90ac59. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021602492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc419f0e1ed5c8c2cac0c8fb6163841cc9a98d02bb19b5640328f8e522205e0cc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7630601666.