abstract contract Auth {
    address internal owner;

    constructor(address _owner) {
        owner = _owner;
    }

    /**
     * Function modifier to require caller to be contract deployer
     */
    modifier onlyOwner() {
        require(isOwner(msg.sender), "!Owner"); _;
    }

    /**
     * Check if address is owner
     */
    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }

    /**
     * Transfer ownership to new address. Caller must be deployer. Leaves old deployer authorized
     */
    function transferOwnership(address payable adr) public onlyOwner {
        owner = adr;
        emit OwnershipTransferred(adr);
    }

    event OwnershipTransferred(address owner);
}
/**
 * Allows for contract ownership along with multi-address authorization
 */
function isOwner(address account) public view returns (bool) {
    return account == owner;
}

/**
 * Check if address is owner
 */