NumberDuel is a provably-fair 1v1 guessing game settled in USDFC on Filecoin. One player seals a secret number 1–10 and stakes USDFC; a challenger matches the stake and guesses. The number is sealed on Filecoin before anyone guesses, so it can't be changed and can't be peeked at. Crack the number, take the pot — miss, and the setter keeps it.
