Is it possible for bitcoin to break down the 45k level.
It is absolutely possible.
Bitcoin was at 30k not two months ago. So a two months retracement would not be unheard of.
Bitcoin is extremely volatile. Especially during a post halvening bubble such as right now, 2017, and 2013.
So there is no telling how high the current bull run will take us. My guesstimate is we will test the 100k prices, or more.
And with every bubble, a bear run arrives at some point, or else it wouldn't be called a bubble.
But I am fairly confident we won't see the 30k prices again. However, price confidence in Bitcoin is an oxymoron.