lock a pot behind a secret.
anybody who works it out takes the whole thing.
a box holds tokens and keccak256 of the answer — never the answer. nobody can read one open, including whoever deployed the contract. commit your guess, wait one block, reveal it, and 90% of the pot is yours before the transaction ends.
the cuts are a hash. every box wears its own.
the rack
the contract is deployed and closed. it opens the moment the token exists — no box can be locked before that, including by whoever deployed it.