Moving bitcoins to Stacks is easy, since Stacks reads the Bitcoin chain. But how do you move them from Stacks back to the Bitcoin main chain? Since Bitcoin clients aren't aware of Stacks, it's difficult to see how that would work without trusting someone to issue the correct transaction.
I looked over the Stacks site and didn't see a clear answer to this question.
I looked over the Stacks site and didn't see a clear answer to this question.