The 162 and 1 GRC received by everyone yesterday which was sent to an apparent address of 1Wh4bh are actually "burn" transactions to an empty address. The wallet currently has a bug that incorrectly marks this as a transaction that is yours and displays it and adds it to your balance. The amount is not spendable by anyone, because it has no actual address/key in the transaction output script. So there is absolutely no danger of double spends. We will be issuing a new leisure build with a patch in short order to suppress the output for both the balance and display. Sorry for the confusion, and disappointment... everybody is not 163 GRC richer :)