function buyForBtc(
        address _addr,
        uint256 _sat,
        uint256 _satOwed,
        uint256 _wei,
        uint256 _weiOwed
    ) onlyOwner withinPeriod public {
        require(_addr != address(0));
        
        satFreeze(_addr, _weiOwed, _satOwed);
        satTransfer(_addr, _wei, _sat);
    }