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 0x62df98f75230ae2e2f77cd0ea70cb8b39fd0e46a5d96ac0477ea2bda494eb3d3. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/872a3242-c74c-49b2-b2bd-0a5a1091aa33.json and https://artists.proofprofile.net/proofs/artist/872a3242-c74c-49b2-b2bd-0a5a1091aa33.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53de236aa2681b56cdc2b082a2afa8b6c4425a2652b7ad981dee9bdff112473b. 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/QM4TW1596063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630a665422ac5a9335dba0bb11629ae9fbabf7938a1a42786f80815f3094098e. 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/QM4TW1596064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9828dae0ddb09ac4c477620d735fe0aab7e4cca13508a6b14ead3664354c2967. 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/QM4TW1596067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c29b73b4706790811e99a33b4b2999d8503385449ee879c938806ca854c7f14. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QM4TW1596071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ef6f9a776be0aa3e600c3f8e1a063acf7229d8f50616277cc8c96c6ea04725. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM4TW1596068.
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 0x42fc5d7e8c90688d673fb2b9d7e004d7349c44bc3554bda4d1a503e832de1812. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/QM4TW1596072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae2524207c82cf4b5ea1fc815976e46103c8307a8c1469ba0cd54bc8421c2dc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM4TW1596086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ae2b91c632301bbedce5582d217ecb20046141634336768f5f5f82a48ac3a1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM4TW1596090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a4ae0dde77e1a348daa309f710f01f00af68cc7e9f267d14465c62f0158bc8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM4TW1596094.
Chavela Vargas vs. María Dolores Pradera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81143f0bb158ae03f6dbbff16a0ebbb4f460adcec49c98febc96ef5ce04d3fc. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USV291386448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef1ca48feeb2dd7d86c01c6567e91c70873d56e0e49d9fdcc280f50406cbfd7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USV291386450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49281b53cedc873e02a700b672d9a0c65895aa845e257bf28cb7f923b9a17c43. 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/USV291386468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707651aa2a3ec409c43e0b200746628f6d4ac7a65d452f2ea83822dbb239d5f3. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USV291386446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fe44d42e33709e47298fff40d1942f925f2b3db663e10bcd1f2c85b6ef35e1. 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/USV291386452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370c3f10aa7d27639d12216d7b8c01a38882a7f8a474f768fbd3496a3e2abe6f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USV291386454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7661dea3021449df091eca8194a1b8213476ffcb4be14959cde01d16666db24d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USV291386456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87db224f5be1e15392697f4bc7459960b0c63640f5036d2753bd6108fdf2c3f9. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USV291386462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f591f96401cc75d8cccfb7789e0b11865e438bed92b43c152de1b2fa970083c. 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/USV291386464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12627a38503350669ee3ff9fbdeb6191ac3eb953350dab78ad37ce42187b671a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USV291386466.