Verifiable randomness for Somnia. Native. No fulfiller.

import {VRFConsumerBaseV2Plus} from "somnia-vrf/VRFConsumerBaseV2Plus.sol";
import {ISomniaVRFCoordinator} from "somnia-vrf/ISomniaVRFCoordinator.sol";

contract CoinFlip is VRFConsumerBaseV2Plus {
    enum Result { Pending, Heads, Tails }
    mapping(uint256 => Result) public flips;

    constructor(address coordinator) VRFConsumerBaseV2Plus(coordinator) {}

    function flipVerifiable() external returns (uint256 requestId) {
        return COORDINATOR.requestRandomWords(
            ISomniaVRFCoordinator.RandomWordsRequest({
                callbackGasLimit: 100_000,
                commitDelayBlocks: 16,
                numWords: 1,
                useVerifiableEntropy: true
            })
        );
    }

    function fulfillRandomWords(uint256 requestId, uint256[] memory words)
        internal override
    {
        flips[requestId] = words[0] & 1 == 0 ? Result.Heads : Result.Tails;
    }
}