Nacha Guevara (born Clotilde Acosta, October 3, 1940) is an Argentine singer-songwriter, dancer, and actress from Mar de Plata, Buenos Aires province. Biography Trained as a dancer and actress, she d
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 0xf58c4b19240007304c66689487f4a85d66ae799574286f550d7909f7a9864f29. 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/e1e4839b-1dbd-4ac4-bf8c-18cbf2ba7354.json and https://artists.proofprofile.net/proofs/artist/e1e4839b-1dbd-4ac4-bf8c-18cbf2ba7354.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 0x523b19751779df318b3317f5ec876bd8096664ece172d006d7cb75658544b0ac. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ARCUW7500011.
Nacha Guevara Canta a Benedetti (En Vivo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190d3dcd1b5314cf2a1d8c90c145064c379581da4f3e51c211a0bfa9f8f34fe9. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ARCUW7600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c667f223bd6a26541fdd830028a97a94621bc1cefaea974d42fda0177ea83e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ES5087700138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dde398139fb0a562ed4aeb17a128be7668784494fd27ffe6fce4d38fe8d6dd6. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ES5087700142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8848a4baa4fffae3abb7ad9e4571e8d71286d253099aa8ae1d59ef8dd313faf7. 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/ES5087700136.
Nacha de noche (En vivo con Alberto Favero)
Nacha Guevara canta a Benedetti (Grabado En Vivo en La Habana, Cuba)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f04c51a55cb2af05eca77512e6f4114d5861715a839650d075e3b5f094d285. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ES5099800496.
Grandes canciones de Nacha Guevara (Remaserizado 2015)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37c26aa1f6ad5e301c47e68db11bb89158c3f534bd4f54638ae32039c08e920. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ARF100300322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c8cfebe1daf8c25c9bf83404c9d3c4ae671cf3556c580ba512204d1dda0f54. 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/ARF100300318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac777a91b9152ffabe4e247ce92d5174cbaf1529f120120488bb1cdf9f54347. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/ARF100300321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52aa64fe32d57b44228c2ea4c2171d7fb8eab80b39e5d1f2261f24bd97c3ccab. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ARF100300319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2baec3ea52e4783ae3edb0d153490f07f72284dee84366cbe05caca6adf12d4b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ARF100300325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76a68f85b9d91d730150d6845725ad833e47f5eba8d476fa7f3300d4bd5bc08. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/ARCUW8400002.
Buen Viaje con la Incomparable Nacha Guevara
No llores por mí, Argentina (2015 Remastered)
No llores por mí, Argentina (2015 Remastered Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e53b090134ed99f1be052c83b8d3dfa6af796173e2e4cecc600db236443a6bb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ARCUW9100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24075dfc0f7a262a0f299c6c11b20be17f2b865d4a1a60fe2ce0f621e8a6d2bc. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/ARCUW2300016.