> Say you receive 10 Bitcoin as, I don't know, your salary. You then spend 0.01 Bitcoin on a sandwitch, leaving you with 9.99 in change. Because you cannot safe

> Say you receive 10 Bitcoin as, I don't know, your salary. You then spend 0.01 Bitcoin on a sandwitch, leaving you with 9.99 in change. Because you cannot safely spend change until after the sandwitch transaction is fixed in the block chain, this freezes your 9.99 remaining Bitcoin for about an hour. They're still yours, you just can't spend them. I agree that the current system of address management is impractical for some applications. It should be possible to automatically organize addresses in a way that small amounts are sent from addresses that also have small balances, so that this problem does not occur. Your salary payment provider could split up the payment into 9 + 10 * 0.1 Bitcoin. But it will take a while until the concept and the UI is there.