Powerball-like (with modifications) lottery contract implemented in Fe. FOR EDUCATIONAL USE ONLY. NOT AUDITED OR LICENSED.
The domain of the balls being picked can be arbitrarily set during deployment. The size of the domain does not affect gas cost during draws or claims as we use a Generalised Feistel Cipher to shuffle and pick balls without duplication.
The number of balls picked per game is set at 5 as a constant, but can also be arbitrarily changed in the code. The number of balls being drawn per game does slightly increase gas cost during claims.
Whenever a participant of the lottery attempts to claim a winning entry, a multiset equality check is performed between the drawn balls from the previous game and the participant's picks. For this, we utilise the grand product check from PLONK.
Depends on the feistel_shuffle_fe lib, vendored as submodule. Use git submodule && git submodule update to install.