Chavela Vargas (; born María Isabel Anita Carmen de Jesús Vargas Lizano; 17 April 1919 – 5 August 2012) was a Mexican singer. She gained widespread recognition for her distinctive interpretations of M
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 0x7be94d2795c081f547607587aecdfe21fa231b9651680b970b3d80fae2291058. 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/5c4d69f3-2f96-4fa7-9e4e-eb8b72cafe02.json and https://artists.proofprofile.net/proofs/artist/5c4d69f3-2f96-4fa7-9e4e-eb8b72cafe02.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chavela Vargas: El Concierto del Palau (Live)
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 0xbee226400703ee5a986db01dff62b76c3a8b3ed399f47286506556814005b35a. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/ES7351610168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bca9d9c9cfe8669ba2eaab0bd4b745ddb4db3e9fc058e9796c573a0b3e8acde. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ES7351610169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698f6d042c2f68bf2a4d989406cb43d4e93e1059d230d3bc9eda91d894de4c28. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/ES7351610160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c45516babba07ae567d2a0c94492e3a7b001f6f279736313ea8c6475245cd3a. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/ES7351610163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f95fbeddd6427adf448806323176a4baa1e50eb588b1af1019894afbbd0eccc. 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/ES7351610165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7987004b61e1d01d3382864bdabd894c543b456f55cbfc89b6cab5c8a7bcc56e. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/ES7351610166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae68824289f580fb7691c15b01bb10eff8aa175c4e412192840e61c12d5084b. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/ES7351610167.