thumb|right|Túpac Amaru II, an Andean cacique who led a 1781 rebellion against Spanish rule in Peru thumb|Cangapol, chief of the Tehuelches, 18th century. A cacique, sometimes spelled as cazique (; ;
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 0xa788f8cb61c1895ade97d72865cb228bf98329a4057a243608225ef2424df52d. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a079e8e-6165-4ca4-99d2-05bce6fe4192.json and https://artists.proofprofile.net/proofs/artist/9a079e8e-6165-4ca4-99d2-05bce6fe4192.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).