Zeferina (fl. 1826) was a female leader of an 1826 slave revolt, the Revolt of Quilombo do Urubu, outside Salvador, Bahia. Early life and enslavement Zeferina was originally from Angola, but was br
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 0xea547b53cd82ef28e2953fa8d61bcc35e9f8a7f3da1ca734f23bc53344ca635a. Chain 2 (Bitcoin): anchored in block 953847 (2026-06-15T22:51:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00598454-0173-4a51-930a-f0fb9d97fb28.json and https://artists.proofprofile.net/proofs/artist/00598454-0173-4a51-930a-f0fb9d97fb28.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 0x1efe26d1d02b554a8f5be6ffda4befbfaf0c939f53a77d8892bc755917e548ac. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BRAGL2100082.
São Jorge Guerreiro (HEARTBREAKERS Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0f19905a84b2789707770e724f56b53ac00ffc0a234f6118ef894e6a52e604. 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/BXE0F2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0173385fc4b6c13aa5686863d48d191c1c9747e4e626935dd9290b8745e0091b. 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/BRAGL2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6de986be661884b031650e5337b649dbde422f6693fe6fea08f2c1d54822af. 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/BRAGL2100100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c90517d87f306fab146e238b8e1948602c5a4f28267f8ad0c4c366e4592692d. 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/BRAGL2100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860e6404b3e47c81802d1f7638489cf0d05e77ca6bb3d048adc680311a91f290. 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/BRAGL2100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec26225282439f6a172d1ed7c306c569504eb70eec81e187e4037ae2dc2d94d. 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/BRAGL2000050.