Roberto Fonseca (born 29 March 1975) is a Cuban jazz pianist. From an early age, Fonseca was surrounded by music: his father was drum player Roberto Fonseca, Sr, his mother, Mercedes Cortes Alfaro, a
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f082d1eef4a464e61b42275faffdc782803ac458764bda17e5db25eb6b2ad1. 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/39952dc2-48b6-432a-bb4f-73122a337229.json and https://artists.proofprofile.net/proofs/artist/39952dc2-48b6-432a-bb4f-73122a337229.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
ノー・リミット：アフロ・キューバン・ジャズ
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92343048d02e2b6789f2269b1f0bd4a39fd158c3f1341221136f4c7c8f282dd. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES76A1100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff49416073f9790e82e18ed203e9ae8b73ad75be1690bdad24e6c41e50e86b2. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ES76A1100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a593ef0aa4db744be4663c2383d9ccf3a30033900d556ca755a856cd0c2bf93. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES76A1100077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92343048d02e2b6789f2269b1f0bd4a39fd158c3f1341221136f4c7c8f282dd. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES76A1100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93bb361a91a7a14bb5100d58892ca71f4f5a16eb4466d91d25df268af8f6398a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES76A1500144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2f61b869c05ae38b583f95d19d7bfd23be2ddd5ee7230d9e773ed703144b17. 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/ES76A1500145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1103e3e434cbc02d461b21c21d306ff5fbaa02de3575538bc154ad2bcd0c9679. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES76A1500146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6cf15b253e37bcbacf433029e1d41af92e9f3f9e9080183dd639134b278b62. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR6F31902030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd692fce05a5bbe2563c0dbdb593b3c4a18c59c8b9fef20e49bf42408f50a9f82. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/FR6F31902020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f58207d238a69688bde19aa4710255b18b72cd60ed1702296e19f841744ca09. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:09:36Z), 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/FR6F31901980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442d544d33253e73ecf91795e117a68634091b2302bca46d5d10051a8b0670e6. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:00:53Z), 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/FR6F31902050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3ac82c96c207c28ec75ba66fb0e313a5099876910c012063000acad88b6c71. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6F31901930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed609353da86c727efe2c5e8884b9e480035f8029444fcb9993e9283c1ab82d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/FR6F31902040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b05a42654886d5066e9395830e7c496b4cc2cdf117325acd36f10a053164d7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6F32301420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f37b7ddbe45bce98eb52e2db0238894cdf6ae22d1c0349b15e674225d3ca4a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR6F32300650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2416555ed83974e9ad73f75199da5accdf836cf238638c3b74d6606944b04180. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6F32301400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c76e92f503f07b72ac92533622219a7f26ee3313513d1dd265d2b0d7b2da43. 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/USUS10410024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1333222643027a7bf53848eed6a70e879a906baf9d5b46b7477bbd39fbc987f7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES76A1100068.
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
The Real Cuban Music - Latin Jazz Club (Remasterizado)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308ba90ef1f47d53a2992c54b1c1a0d40606d154bd3bd3191f913d878aa8a664. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/ES5021800297.