Gragoatá is one of the 48 administrative districts in the city Niterói, Rio de Janeiro in Brazil. It lies in the southern zone of the city, on the coast of the Guanabara Bay. It holds the main campus
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 0x0c03632903b812275863213569f9d5552365bcfdf2b042e3f8f6f981f9c79e51. 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/bb4375f1-a0c1-49d9-821b-1d67e7f93e60.json and https://artists.proofprofile.net/proofs/artist/bb4375f1-a0c1-49d9-821b-1d67e7f93e60.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 0x7b81e226ce35f3f9f8f39e33755b00e94a516608b7b97db87dc1c319ccc14e13. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BR1TW1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3131883b46590c94d60ff1a9c77d5f62a758662087542539d799ca33556a76fa. 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/BR1TW1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc291ea4624ee9b353107621292060d8c4bd61035c9b958c9d946288fed2ac35c. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/BR1TW1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09211af4333873a86e8de0343366d6d775d12738d210e8e9b323f75f3db5a0fb. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/BR1TW1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7932d5a75e24253d0055d411ed80acd3c4d2220ad02b8f887e4fb362efb2937c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BR1TW1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8b2e02ded4b363739e657769b82ec7cf14098be7a506e0ad6bffee038af2fa. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BR1TW1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818fe76c7f46ed3692e25ebb2163db9f8c54b75ec2b6267eeb0cf380b0476162. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/BR1TW1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5191b0ea5337b4f7a8a9a0ceead4b08054030e6d23ab30091bfe56be6b8ccc. 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/BR1TW1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667ba94f78931639d76b30bafa91fa56ddc5627f21818c78d03b76a7ff253f73. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/BR1TW1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b329f9a4884711c7c69de70220654649e4ebf65f77793985268b8cc679f824. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BR1TW1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3306d39e7ce7e09fe25ebaf37fe3d6914046f5b1b13be7de377be8e6315d83d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXNBC2400001.