I build clear, useful systems from complex information.

Teacher absence runs near one in four in parts of the world, and paying teachers for days they can prove they taught is known to cut it — but the proof gets faked, because a photo carries no trustworthy timestamp. Chalk Chain turns a live Solana block into three words the teacher chalks on the board before photographing the class. A Solana program, not a server, checks the photo was sealed within 150 seconds of those words existing; surprise re-checks timed by future block hashes extend a hash chain written in chalk; a vision model reads the board, and each verified photo pays a USDC bonus that anyone can audit.

A two-stage hurdle model that finds Canadian cities short of fast DC charging, then sizes the shortfall. A prescriptive layer turns each predicted gap into charger counts, urgency tiers and costs, and a mixed-integer solver picks the highest-impact sites that fit a fixed capital budget.