Jumbo! Contract（raffle logic）

Jumbo! Contract

The block hash of the first block on the drawing day is used as the random number source.

The management will initiate a transaction after the lottery period ends and conduct a raffle　using the above blockhash.

Detail

input: rank, index, _blockhash, season MaxSupply

output: Token Id of the winner

input details

rank = grade of prize

index = number of prize winners

_blockhash = 1st blockhash immediately after the raffle period ends

function _getSeasonRandomWinner(
        uint256 rank,
        uint256 index,
        bytes32 _blockhash,
        uint256 seasonMaxSupply
    ) internal pure returns (uint256) {
        uint256 random = uint256(keccak256(abi.encodePacked(rank, index, _blockhash))) % seasonMaxSupply;
        return random + 1; // 1 ~ seasonMaxSupply
    }