pragma solidity ^0.4.18; /* * Ownable * * Base contract with an owner. * Provides onlyOwner modifier, which prevents function from running if it is called by anyone other than the owner. */ contract Ownable { address public owner; function Ownable() { owner = msg.sender; } modifier onlyOwner() { if (msg.sender == owner) _; } function transferOwnership(address newOwner) onlyOwner { if (newOwner != address(0)) owner = newOwner; } }