    function comfirmRedeem(uint _value) public onlyREVIEWER {
       require(params[REDEEM_METHOD].value == _value);
       require(params[REDEEM_METHOD].state == true);
       balances[assetOwner]=balances[assetOwner].sub(_value);
       totalSupply_ = totalSupply_.sub(_value);
       params[REDEEM_METHOD].state=false;
       emit ComfirmIsses(msg.sender,_value);
    }