Is there any way to track where I got some BTC from?  I checked my wallet this evening, and I received .03 BTC to an address that I haven't used before and haven't given out to anyone.  I know more addresses are generated when you send coins to someone else, so I understand where the address could have come from.  I'm assuming the new address was generated when I sent some bitcoins to my Android wallet.  But why would I receive BTC to this address?