By the way, if you held your Bitcoins longer than a year, in the US they should qualify as a capital asset and therefore you would be subject only to the capital gains tax, which is 20% a year plus some additional percentage (<5) if over $200k.
My understanding is that it is a misnomer to say flatly 20% and that the rate is based on one's 'earned income' level. The Wikipedia page I pointed to earlier seems to describe the same. It seems to indicate that the rate can be much lower if one has no job or other source of 'qualifying' income.
Accd to Wikipedia, the additional percentage over $200k is new-ish and associated with Obamacare. While I dis-like Obamacare and would rather see a single-payer system or at least a public option, I do like that they are getting at least some money out of people who engineered and exploit the long term capital gains loophole. It would be ironic if I myself got 'burnt', but I can only a complain so much.
We might end up in a funny scenario where I pay quite a large amount of money for Obamacare, but do not receive benefits because I disagree with it on philosophical grounds and don't wish my money to go towards making the parasitic and lobbyist heavy health care industry and corrupt politicians even more rich.