Querência is a Brazilian municipality of state of Mato Grosso. It is located in the northeast of the state, in the Great Amazon Basin. Within its great limits are part of the Xingu Indigenous Reserve,
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 0x1fe3cc5a7bb9d90db802acf9c198547c1d5d1e798d8d04a8e02cc5b7e16ec2d0. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b8d8564-b924-4d84-a93c-90e1e56740c1.json and https://artists.proofprofile.net/proofs/artist/0b8d8564-b924-4d84-a93c-90e1e56740c1.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 0x525d63dc7bf8e3b6bf7e452886c8793bad564c39c09021ad0c2ef855cf1467f0. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QM6N21570873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981a0a16e50b8a7655152db6276aa311218fe8970f716c687827b5b649158032. 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/QMFME1527347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdb3b04b0f8ca2f03dd12a445fd87ea69e845f3d488d078ab9bb9a2aa665d9d. 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/QMFME1527348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c74830f644f9c511b9b4502707da89e994e76f8dd689fbade9666487b507bb2. 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/QMFME1527349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5873efd576e01bd5fdded1fac6247717794e6d8de359f79485b90c12fbf531e3. 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/QMFME1527351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff5afdda60acc79c103cf322a4d0ca67eb28362a612908dfabc84defcb2509b. 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/QMFME1527354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0f1644133e9a064b003d1ae6b4f8ff743a6d42f243071c1f463221e0a60405. 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/QMFME1527357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf108726b436f0c158caf6fcefd107e316fcbaf1413190a50a785a31911b5f704. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QMFME1527358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122603816eb5877a6aa229e92c613e3438fb6b1044ba2a9d76b3b6add81a89c1. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QMFME1527352.
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 0x2e104542d0f2e5b56419907cf24174d14507a6fad551ea241733139b6682f211. 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/BRVR11000394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f029eea1b9d5cb9667292441cfac0c5fdf7253ffaed41a25eb184ed526da443. 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/BRVR11000395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98ebd305c176b58c5f0ea52a9f76c55947083f179169091ed5f3fae5b3f7ceb. 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/BRVR11000397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01198da7c98767fdb5e22e73441dcc0cfb34f0aafc4dc1f6ae90263bc5b711f. 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/BRVR11000401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c08bab02995eca55a89d66b3db2da3058e6c66dee97b86a6dedb434080a2e44. 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/BRVR11000400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d63f2c3a5f8eeb4f300eeed66c9542d3398b650a05d17517c097ee5d22a8337. 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/BRVR11000399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1cf6d8bf3afb70fe530b493a4da872bb934444c48cf97a0caeed8287b392518. 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/BRVR11000405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec5cca38a656cb7ce0fdde82087040176cb3645d87727fcef04423838ac91cf. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/BRVR11000396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bedfe1c9f4b1551a4fb9220bc363777085d4487110ef4aa03f007c5f6fdae4. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/BRVR11000402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4144be76d3569b1b73218138be34bb065c116631ccfe3c4fc5c96433d5bf0fbe. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/BRVR11000404.