Thats already coming with the new one world government but it wont be bitcoin it will be government currency. Its called the mark of the beast - 666. That is the first thing I thought when I saw bitcoin.
and u believe that?
Can't happen, there is no interface to use and that means you will need an outside way of controlling it, so why ever put it in your body in the first place. Smartphones will soon control everything and while their size is restrictive, there are more functions using Bluetooth mics and the phone is merely carried on your person.