public static bool confirmWithdraw(byte[] _channelId)
{
BasicMethods.assert(BasicMethods._isByte32(_channelId), "_channelId illegal");
LedgerStruct.Channel c = LedgerStruct.getChannelMap(_channelId);
LedgerStruct.WithdrawIntent withdrawIntent = c.withdrawIntent;
byte[] receiver = BasicMethods.clone(withdrawIntent.receiver);
BigInteger amount = withdrawIntent.amount;
byte[] recipientChannelId = BasicMethods.clone(withdrawIntent.recipientChannelId);
withdrawIntent.receiver = null;
withdrawIntent.amount = 0;
withdrawIntent.requestTime = 0;
withdrawIntent.recipientChannelId = null;
c.withdrawIntent = withdrawIntent;
c = LedgerChannel._addWithdrawal(c, receiver, amount);
LedgerStruct.setChannelMap(_channelId, c);
LedgerStruct.BalanceMap balanceMap = LedgerChannel.getBalanceMapInner(c);
ConfirmWithdrawEvent(_channelId, amount, receiver, recipientChannelId, balanceMap.deposits, balanceMap.withdrawals);
return(true);
}