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 0x424975527e3f000880354f771254f6561fbdb07802731e3169fe4eb438a84f71. Chain 2 (Bitcoin): anchored in block 953721 (2026-06-15T01:12:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a4a3cde-13d1-4167-a89c-70850702b837.json and https://artists.proofprofile.net/proofs/artist/8a4a3cde-13d1-4167-a89c-70850702b837.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sambas de Enredo: Carnaval SP 2022, Especial, Acesso e Acesso II
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 0x85ab8308dc0be1debc5a14010e855242b7e3e0199fefbc9c2ea04d910731b1d0. 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/BRLIE2100021.
Sambas de Enredo Carnaval de São Paulo 2019
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57984bfb32430a626d35910aa31a95929eb0776931cbc3e277ccd1e556df4958. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BRLIE1800016.
Sambas de Enredo Carnaval São Paulo 2020
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44feb87baa10f4d57f4db5783c8f0b95f2a2eaf478ed11510c91c05f55006612. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BRLIE1900018.
Sambas de Enredo: Carnaval SP 2020, Especial e Acesso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44feb87baa10f4d57f4db5783c8f0b95f2a2eaf478ed11510c91c05f55006612. 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/BRLIE1900018.
Luz, câmera e terror! Uma produção independente
Sambas de Enredo Carnaval de São Paulo 2018
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5645cda18ddb0029d7f82f4ecddc5e516ba27b1fca063ed61b5f82c97d56dc7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BRLIE1700014.