Also the clear demarcation of 'Mined'. I wonder if this will prove a problem with that obscure rule that mined bitcoins make one an international money transfer agent if one tries to use it for anything but barter.
I don't know that any nation has a rule like that... the closest I'm aware of would be FINCEN's guidance that
created virtual currency has such regulatory properties - but miners just discover coins predetermined by the protocol, they don't create them. In any case, I doubt any legal institution cares about technicalities.