Can your government really be able to track if you never declared gains made from Bitcoin transactions?
Your government, like every government in the world is monitoring all bank transactions, that's enough for now. With time and effort, I'm sure a government could also monitor the blockchain, but I guess this isn't a priority as of today. The European Union is already talking about it, though.
I hope they include deduction of this taxes in exchanges. So it will be easy for us to do taxes. But if that can't be done, I hope they release guidelines.