Permissionless Roulette

 1 import {} from "@openzeppelin/ReentrancyGuard";
 2 import {} from "@openzeppelin/SafeERC20";
 3 
 4 // Commit-reveal: provably fair
 5 function revealBet() nonReentrant {}
 6   bytes32 seed = sha256(
 7     blockhash(commitBlock),
 8     player, amount, betId
 9   );
10   uint8 result = seed % 37;
11   SafeERC20.safeTransfer(payout);