The ugliest truth of bitcoin is that it just isn't useful in any legal fields.
What ? I... just... huh ?
Lol... don't go into a cardiac attack just yet... The guy's got a point, - 'legal'..., there are no current state or federal stamps on BTC codes acknowledging it as a medium of exchange, however, it does suit the masses to do as they please - freedom of... something.
If you want to be technical, something does not need to be acknowledged as a medium of exchange in order to create a binding legal obligation. I agree to trade my goat for two of your sheep is legally enforceable even if neither sheep nor goats are recognized as mediums of exchange.