Tanque is a neighborhood in the Southwest Zone of Rio de Janeiro, Brazil. References Category:Neighbourhoods in Rio de Janeiro (city)
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 0xc96c5ed7fe92a5f7c8b4f56d4a2658b8e991e5ed1c5862c9b79d114b3eeb9f10. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3d896c8-7416-4a61-97c6-f135d9619491.json and https://artists.proofprofile.net/proofs/artist/e3d896c8-7416-4a61-97c6-f135d9619491.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 0x017337c8cca35316917cab3796dae31849bdece91e1fd1b801de72d2d792191c. 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/QZMER2404107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782fffa347dd60f33429923cf9bce586be639d0c9ee4326684954294e81ff370. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:53:33Z), 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/QZMER2404108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e09fa71cd988bc88f917d076ce7d03e7307742439a7322315b5922c8c21bfc. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T11:27:11Z), 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/QZMER2404109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96d0236172e9a495173e58da9b2020c633f4d8aa1f0d5c57ebddd1cfad0d552. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZTBB2408559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea9b2ad4e08fda01be18714cfc88dbee32bf1444462dc9dbc4258b3db8822af. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZES52528141.