Leandro Leme da Cunha (born 13 October 1980) is a male judoka from Brazil. He won the gold medal in the Half-lightweight division (66 kg) at the 2011 Pan American Games in Guadalajara, Mexico and the
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 0x02dba80031fa09a883c51fb1754edde6ca804715460fb127dd46a939bc0b89ee. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14fc957a-23ba-4e81-a675-33fb956e61e5.json and https://artists.proofprofile.net/proofs/artist/14fc957a-23ba-4e81-a675-33fb956e61e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).