Luis Cardei (1945–2000) was a tango singer and actor known for his performance style. Early years Son of Catalina Fontanella -a dressmaker- and Luis Eduardo Cardei -an amateur singer- his health was
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 0x6b2cd9525b5f1d9aedfd5b8599742cf60a9f23b88718938f75618e0de1a36045. Chain 2 (Bitcoin): anchored in block 953843 (2026-06-15T22:27:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0022b670-4a23-4028-a140-4d0aa2ef19e3.json and https://artists.proofprofile.net/proofs/artist/0022b670-4a23-4028-a140-4d0aa2ef19e3.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 0xab9b1453748ce018b95bc965dec6bff92356767a71a4f499c3a744d5a4a9a834. 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/ARG601011723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905ff7bff4868de41b73c13129b42333ed46cca8533d957770169efaa370a7b3. 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/ARG601011724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81fc65d2d0327a9a2ea7322f5b14635ca21adbe6a3a8ead96bcdb29cd3645e43. 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/ARG601011725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0ca81c5beb7bf613e27c3eaa37f664cd6f5eea7aa01c9ef5237a9616cb9bd6. 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/ARG601011726.
Callejón (feat. Luis Borda, Gustavo Liamgot, Pocho Palmer & Hugo Sanz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb9ed7713321681ccd6f0e1ccdc74953e0ca2b853e95dd2b739bff24472b56b. 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/ARG601011728.
Soledad (feat. Luis Borda, Gustavo Liamgot, Pocho Palmer & Hugo Sanz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae724fedcda48943b6a0282db5ff7ca53e87df4ed3508b177712a31a8ef6337. 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/ARG601011729.
Añoranzas (feat. Luis Borda & Pablo Bernard)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfac63fda82f300adeea56f3b91c7319ba7ffffb112506c489f8a3f0eb081df4. 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/ARG601011732.
Alma de Loca (feat. Luis Borda, Gustavo Liamgot, Pocho Palmer & Hugo Sanz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b811c0a8bb3cb9265847f2764f5bf5bda0ceb947633e3ee195ea7d63c901ea. 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/ARG601011734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ffd8c00daf7094701ca3edbac3c202ecc03277d9855ac762f82497a72c10ab7. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ARG601011735.
Temblando (feat. Luis Borda, Gustavo Liamgot, Pocho Palmer & Hugo Sanz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf8074262d2623315368569f9461ff33e1268f2d2e6a9a5d5794f640449626c. 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/ARG601011738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fe4dfb8272fe5d9a7b3adedb7047b4f49e0b1966afffc1e5365a471eefe71c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ARG601011719.
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 0x6fb838257c3af9a63e93f94b437ffe176fd88e5459e3826cfab8785afe04e359. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ARG601011720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2328776b1e187816f21de4035dda8f9951bd78126c195cd7002f8a1afd4814c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ARG601011721.
Bajo un Cielo de Estrellas (feat. Luis Borda & Pablo Bernard)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd000783ac3e7f6149987064bd830f029638bc7d9fd628f35751e9d99fa2502f6. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ARG601011722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39feb2429df1525dd9d8bd6d560ffe11392ca1a3260cb4fc3e00795886ae8b7. 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/ARG601011727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe814dea6c0b3ff4b54b51c4dfd0a555050d2f5e1c1aea4a36f1d3df54b1192ff. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ARG601011733.
La Novia Ausente (feat. Luis Borda, Gustavo Liamgot, Pocho Palmer & Hugo Sanz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1a880d7202cecb5b34f2d5f02463f3e933b46044c3949b90855594e1395ff8. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ARG601011736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0767faef829431e90418c3142d178a5e4acc03cc9044da475133cf33892f59d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ARG601011737.