Lucas Arruda (born 1983, São Paulo), is a Brazilian painter living and working in São Paulo, Brazil. He received his Bachelor of Fine Arts from , São Paulo, Brazil in 2009. He was at the forefront of
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 0xf0c2f2d62779d93931e0f05e148732e4479b96613b3fc73c24ae98de7a154c1d. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03bfaddf-fa35-40a3-a19d-acfb566243ac.json and https://artists.proofprofile.net/proofs/artist/03bfaddf-fa35-40a3-a19d-acfb566243ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).