Álvaro Yuri Alberto da Cunha (born 13 September 1980) is an Angolan singer. He is famous for songs such as “Atchu tchu tcha”, "Tu és o amor", and "Kuma kwa kie". His stage presence has earned him the
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 0xa5664e73608f09896afd039dd2a99b016e9590f3a43d0627fdeac0d8e462dc0a. 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/6b83e60a-3c93-43e1-8a13-bace9148c572.json and https://artists.proofprofile.net/proofs/artist/6b83e60a-3c93-43e1-8a13-bace9148c572.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 0x541d6a738230782d40cdb7ef149660994a9e18f1716114ce6c6270844f908a1c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES71G1612205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd520079a724657e696dd450c80dd04e45ee62ea6a2e1b339b255618c4af3abb2. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T21:01:43Z), 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/ES71G1612206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde25073d0b17200a2e362df7d87b9bf65dad8502cd9e2c8d26c7b59f0e2a29e8. 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/ES71G1612208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fdcb692c5cd0b6f9bda6b26ddc1d6f75890165d0300188ece1bf2a34d3e9f86. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/ES71G1611883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f34a9d117ef7eb4a71dc6ba03e4270324e31c2e93faa2eb6249da75f9bb8d6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES71G1611884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04fe688c3a5fdf715db180d5b0bfd31a1ec581522c92782c0688ed758f187be7. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:49:31Z), 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/ES71G1611889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d54b243266187759a2231d730fed22e440018fb787f31d2777bc3d508742b6. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/ES71G1611890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1039c5403c3ad24c6b90445d00008152bcb66d43c6b95c9d2c496f298313f669. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:11:44Z), 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/ES71G1611882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6878992cb7d51553e509ddf883b442cda56e9f09f88b72aeda664ce5030003. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/ESA011850129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa235acfe9113d7059b4b70a04083527226ee4721481c778e16383c999fbd88cd. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/ES71G1611893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5872162dda3c9240fb501b2c29c30629575b840b6c91ffb7da5482286c08d2. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES71G1611894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022b38d11923a315de07768ab1c917ea644acfdaa17e075f43acc1a159795239. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:31:00Z), 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/ES71G1611900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969d6b1fbf546158daa0505666ac73c349be69da48bfeda7a852bd167aabe49b. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:05:21Z), 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/ES71G1611891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f6cf5f0fd4352a9db62536884b559b849ef216e8a8cf79e317915514996aa5. 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/ES71G1611901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a820c0214423ca124a4ef0bb908705ba7174f50cd759da4708bd2526ad4959. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/PT2GG1700161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02a392e7b818705e84b5bbe0f0c6fd49fff22a0a6bd68a1d2fe27a814d07881. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/PT2GG1700162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148742f74e32ad75e247b27e1838c0c4d165de41211f07407d85c9959fbb05e1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMBZ92094545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1f299eaf9056100b5d03cb669959a231298afa7c941fc0b9c8b8996d897523. 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/FR6V81898426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d788203c80e1ddc39f91c61c0e8c86a6a7a1c7b1da32da50877fe8a7064b3d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR6V81426265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae38a20fbc1b43d9df3754b160dbc9a8bdef6c188bbc5661a8f5ea51ba089211. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BRXPP1100006.