Cidinho and Doca (in Portuguese Cidinho e Doca, also as Cidinho & Doca) is a Brazilian hip-hop duo made u
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 0x9af408f8a1645df879b6bdbbe6d950720a2d53c2a4fb5676001b730a88a1238e. 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/8b83e600-4f6d-4bd8-b38a-85379a521844.json and https://artists.proofprofile.net/proofs/artist/8b83e600-4f6d-4bd8-b38a-85379a521844.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 0x434b30ac588df9dae8e09fba4e516192ac582679ba0e9790620200a341a86d75. 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/PTVI10800676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550962f992e5c15019bfa6c97c51b9611af28d5485d51a6ae807cf46200a7fad. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/PTVI10800668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81479f86b061846d50deb61897948c59483e5fc1b28a109ee77ede0e04ef25ee. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLC280810805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550962f992e5c15019bfa6c97c51b9611af28d5485d51a6ae807cf46200a7fad. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:15:30Z), 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/PTVI10800668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4ae601cebd3b86531931f4792a2b2a555ba986d9d9564e26031e7ef4dd4c89. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:03:03Z), 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/PTVI10800675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550962f992e5c15019bfa6c97c51b9611af28d5485d51a6ae807cf46200a7fad. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/PTVI10800668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434b30ac588df9dae8e09fba4e516192ac582679ba0e9790620200a341a86d75. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/PTVI10800676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d8e6bfff0b2d08cfa3efa93693805214ac53356bc6340dce5d40c3d1375bb7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BRLRE1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5011a461a60356c2d67e804a37759bdb909179045167975c351d29fd9dbfca. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/BRLRE2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ae24bdd20bc1488327c952a8d9b42a4defe143b05dda078662fac3c38e3f6e. 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/BRLRE2400016.
Baile do Dennis (Ao Vivo) [Deluxe Edition]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd23d84feaa00134fd8a0a1bae158599e046289310c9abb1aaa66271eedd471e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BRT3O1500050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338571a769c2cf64be04e8a3dbfbb0f6d6bb163c8e4a9758ce80054b4c9e5f92. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/US7VG1600641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba649ab3faaee160f902647f94f9c8582ce74070f8d4495db4fcd968b54b18b5. 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/BRLRE2400131.
Progresso Pros Nossos (feat. L7NNON e Cidinho & Doca)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f661c0d9b507e2bc40212c4e21452cb3a8d1e07d1f041fc47e4aa878072de2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BRWMB2201142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45a541d260d7ae98fd26ebd75802e1ccb39a4e57c8c27fb03a661bdc3457643. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BRLRE0300127.
Slam Dunk Presents Funk Carioca (Selected By Tetine)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30e174c12c23079661234dce4472686695edd7702c66cb3ed70bf52ced6b744. 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/GBCLQ0700215.
Funk Brasil Relíquias (Vol. 4 / DJ Marlboro Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad22b8fc6b0ffd4901d0125721aaac1ded768c3898bc3021036f6364a0f708a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BRLRE1800079.
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 0x4f6cccddf4837aed6ff5f82f6417cbd6d95f25c654320a8bfd6c464257cfd4bf. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/BRLRE2400130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c65f40f546523c7c0dbb72a3bb236cde11839feb6c4c6081c4a8d817065b9a. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/BRBJC2400225.