León Chávez Teixeiro (Colonia Guerrero, Mexico City, April 11, 1936) is a Mexican singer-songwriter activist and painter. He began the composition and interpretation of social justice songs campaignin
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 0x1bcd9c1ef2033b82f8c21f77e83b9740321ea968df57f0c44e838e4f07745783. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4aee67c-2afc-4f17-8bd0-eeedc54e7ace.json and https://artists.proofprofile.net/proofs/artist/b4aee67c-2afc-4f17-8bd0-eeedc54e7ace.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 0x278865a62e32c80ad5a6e7e9f01d5e7a57611ee429af60fa6410ecffdc54ac7d. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QMFME1967222.
La Mujer (Se Va la Vida, Compañera) [En Vivo]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ea89f5934092d9daf5958ca979d15d3f2c6fd2264eac91b047e07355cb324b. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:46:21Z), 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/USHM22062182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc665449800a645ccaefed6095a317ae21620b3a4f1502dbe89287a7069fa50f0. 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/USHM22053173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfd375eb8f84a35ec6a466bbc41f2048f7fb4500552de1a850096d2becc80cf. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USHM22053175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd55aaa32efbe20b331083373c26527a4e81441179d86a591f43e1b7735f326d. 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/USHM22053176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de0dd2c33f58a317bebbbbac064613afd05e8a01de1c862a3b1addf23f737cc. 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/USHM22053178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc326491af2c49001002dcccddae997edb1ca3103ecfc25069910d3eb7409a316. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHM22053179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe94bef34bd30cef75f51ff1c6e435eefbebc9a76fc9dcdfc85d278d26fab323. 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/USHM22053186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae992ea553888f9114b59d10dbc1d5e76825980c3b56bf9ec4ec379b02322c9f. 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/USHM22053188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45aed9334ea25b2a337ecf8249429bf050b38b5f3f3a73c3ffa41f6f6cb72ba9. 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/USHM22053190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc7425ea87d0e2a793213d113466cb4d829be6948b5dbd403c77c96ebcd6cf0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USHM22053194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17411dd676c51c17bc24df35c555b8ef0c5ff84f3621722dedbc428c4a4ece9. 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/USHM22053195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecefc5ac8bd4a1424433bbb0a44d87d2156ec7e20b13d0661c1345fc3e2d8093. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHM22053197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b24586b27f3727a52e56ab5e980df8b20012d970445b5a5c9eb8313f17fc770. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USHM22053174.
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 0x309f903af3ca8bfad8176f950ec1b54c47ecb390c14c997d10fec72737f681bb. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/USHM22053177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21e93e05ea93714b49e92960c6bd6a4cd5291c61db9921eb9e0ae26dbd1473c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USHM22053180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61249c7556d1c9091a2b1fa07044651fd992127d2322fdd7c35fd46862635a61. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/USHM22053181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d55c4cd1fd5f626cfb9649a35f18c2d4514860be32d9c512b481733337f6413. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USHM22053182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c3ea29504b1c3e704287032b38d3a1845215aeba49349f01e7bf357538ce32. 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/USHM22053184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4b924f9b2b470e9e650580a885fb035959453c0c00ad5c195656038a503ba8. 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/USHM22053185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87ffb8d54480a3b9a6a26d3f64bbf19b0324495546eecc8de93f932bea0d2aa. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USHM22053187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c824b7db85177739c37530eab226d779d720a8aeb4d977c9a55d56aa51af6b4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USHM22053196.