Bitcoin. Bitcoin relies on SAT being unsolvable.
The payout is pretty great.
Solve SAT.
Short the hell out of bitcoin.
Release solution.
Solve SAT.
Mine 1 block each day.
Sell.
Solve SAT.
Short the hell out of bitcoin.
Release solution.
I'm not sure I follow -- do you mean there is a challenge open somewhere which pays 200k$?