Pick an address. Name the day and the measure. Put up a stake. If they take it, the chain keeps the score and settles it without either of you. If they refuse, that is written down too.
The hall is not deployed yet, so nothing can be thrown. Everything else on this page is live.
A bout is settled from one public fact: what each wallet held of the coin when the bout started and what it holds when the window closes. Neither side reports anything, neither side can appeal, and an even result returns both stakes untouched.