Rafael Vázquez (26 March 1929 – 22 July 2022) was a Mexican singer, songwriter, and actor. Born in Tampico, Tamaulipas, he studied voice with singing teacher Carlos Abreu before achieving success as 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 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 0x7184081ebd8628ae75ea548d1431038fde9c96e558848a732ec628fba6c09b1a. 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/410018ed-3418-40ec-8b41-12a21148eec1.json and https://artists.proofprofile.net/proofs/artist/410018ed-3418-40ec-8b41-12a21148eec1.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 0x5e0933972fc1d826823e277839546a5fdad956ec7fe2bffaacac6152c57d5152. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXF367116956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f7b666bbba5946d59a7a5a492f2d73a766643308d3a3e869c9b1993959fcb6. 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/MXF367117665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2faff35b46c2faa3f085bde8cc95da0d45ce924489f791adb651dc582b56201. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF367016448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121d6782bdd4af4936c4265acedb83515fc5909bf83cc23640da90a420a3f861. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/MXF366914851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44bf42a9d7f762381be4ece870b58ffc446f82856ae94d51dfe50ed5beacdb90. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/MXF367015621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3ca4c5e10b40cc9ab4595429a73ae5c81e61daf86f878456811ff1d9a3753e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/MXF367015483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cf4837e3ca1c74f61032cf057a50f2d3a31c0a4983d506b972ca2525bde636. 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/MXF366914850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4638cb08845b7818aaa2f5f7fc3aa28c253aad6459bb62c4c3bede0403f4b1. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/MXF367016585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d92802a067688ed62156e480f5be13e65a84d651a6d3eed7b25044f027781b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF367015528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485f6737b1d9720d5bcff12fdbfa781ccca2cffc23199dd4faa86e744a39cf77. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/MXF367117638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc2b55283ef687e1ff45ba3cde5c937dafa76ecf024201936de1e593c477630. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF367116804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd088afc9d0a23eca158d14530a4a32cd5347516fa75607dc4530ce3bbdf4d2e3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXF366914887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009ac703a47b713d37eadba3241da872e586a666babe868c77da92c98b3291ad. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/MXF019800562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd088afc9d0a23eca158d14530a4a32cd5347516fa75607dc4530ce3bbdf4d2e3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF366914887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121d6782bdd4af4936c4265acedb83515fc5909bf83cc23640da90a420a3f861. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/MXF366914851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc2b55283ef687e1ff45ba3cde5c937dafa76ecf024201936de1e593c477630. 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/MXF367116804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485f6737b1d9720d5bcff12fdbfa781ccca2cffc23199dd4faa86e744a39cf77. 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/MXF367117638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1848ea0c362a4a705fb56cdeafc44e9b72dd7a46b1066f75496d7db0fc2de6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/MXF367015484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d92802a067688ed62156e480f5be13e65a84d651a6d3eed7b25044f027781b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/MXF367015528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3ca4c5e10b40cc9ab4595429a73ae5c81e61daf86f878456811ff1d9a3753e. 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/MXF367015483.