All is hackable, above all if it is a online system.
But i think that is not easy to hack the bitcoin system, and the team is constantly work to make secure their systems
The same thought with mine. Nowadays, things can be hacked even the most secured assets anywhere in the world for as long internet or online system is concerned. However, in regards to bitcoin, I think the way it was designed is not that hackable as a person thinks for it is secured and proven records of reliability.