pragma solidity >= 0.7.0 < 0.9.0; contract Safe { address private safeOwner; modifier isSafeOwner { require( msg.sender == safeOwner, "Must be safe onwer to open safe" ); _; } modifier hasAdequateFunds { require( msg.sender.balance >= 47, "Must have at least 47 WEI" ); require( msg.value == 47, "Must transfer 47 WEI to access" ); _; } constructor () { safeOwner = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4; } function openSafe(uint8[13] memory input) public payable isSafeOwner hasAdequateFunds returns(bool) { bytes2 key = hex'a12c'; bytes32 result = sha256(abi.encodePacked(input)); if (result[0] == key[0] && result[1] == key[1]) { return true; } else { return false; } } } 0.4.18