Sergio Iván Esquivel Cortés (8 December 1946 – 24 April 2021) was a Mexican singer-songwriter. He recorded more than 20 albums as a performer. He wrote more than 350 songs which have been performed b
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 0x04789eff4c39dbfac198cc8ed3c4e100fefd72d070262057288f3e14d13317c9. 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/f4fc2b9a-2d65-4c8c-bc53-491d45cc91e9.json and https://artists.proofprofile.net/proofs/artist/f4fc2b9a-2d65-4c8c-bc53-491d45cc91e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concierto en el Teatro de la Ciudad de México (En Vivo)
Las Canciones Que Me Hubiera Gustado Escribir
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 0xeec12f153ab6419451d48376d86d0140fb36b664b529ba52108adca829c86946. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:48:55Z), 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/FR96X1611073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ece8f910b0183dc77150cb2a1f6130c25ea0808361abc6c3dc48b69f1d8b03e. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:27:02Z), 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/MX2629679593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4906f7877249ff96922661d3796a4a05f24c65b0395b3cc9ae1b052331ff7b6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-21T08:34:37Z), 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/MX2629679599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8086008d13db9b6066926196dc6957e117e83fc082d2e449b4df4a1b9445f7de. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T07:23:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2629679602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6215f105fb33e8951332751beb1e33cb8cb34ce6b7092156b81469fa2772df66. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/MX2629679607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ff1ef4e6340f178a4beab079af9499c5d26970e7dfb0cc12ef8ca85fd5dab1. 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/MX2620477073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7162988a8e638d2ba58399182dba03b4a73b4b62a95702aaf3ad3f2007eb81a1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:20:16Z), 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/MX2620477074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3efa40142aad8f78891c2131f75836a9ba3ff2a93a3b670bf90ee3bcba178f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MX2620477081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da12a4fca1afe299c2e29be51dd637f9906f06ff46a98c2e8fa66d31f354009. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/MX2620477083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558a00aa6b3454319b98ed3edd0a10d8b870f948048d8ea68299478cc02917eb. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T18:00:19Z), 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/MX2620477089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253bd8bd904ba8c050916f4ef1d30f91f0e12c7548b5be24f806ab44316bfa4c. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/MX2620469715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ff1ef4e6340f178a4beab079af9499c5d26970e7dfb0cc12ef8ca85fd5dab1. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/MX2620477073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87f889cdb2adb17d8a517e483806c592b4d3ad6957c47dda46bf82aebe38bb6. 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/MX2620477075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3efa40142aad8f78891c2131f75836a9ba3ff2a93a3b670bf90ee3bcba178f. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/MX2620477081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da12a4fca1afe299c2e29be51dd637f9906f06ff46a98c2e8fa66d31f354009. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/MX2620477083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828e5a25e85496621e7dbc443d69669d38ccafad786c3c87cfe7da8870994107. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/MX2620469706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3468f08e8f7d64cee0ac672bce5b08d79f5a69e6e269203a154cac0fa0c149d. 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/MX2620469707.
Sergio Esquivel y Su Trova Yucateca (De Colección)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8086008d13db9b6066926196dc6957e117e83fc082d2e449b4df4a1b9445f7de. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:18:17Z), 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/MX2629679602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5503d1cffbc922a3e295b51c5379b4ca1871cc71ad6ad27adef2f102424613f. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:01:15Z), 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/FR96X1990347.