But I have to say, bitcoin is not unhackable and it is prooven the bitcoin chain is vulnerable! Only because it is decentralize, does not say it is safe / unhackable!
Maybe the term unhackable is indeed to strong of a term to use, though i did say unhackable as a whole system individual nodes and miners can still be hacked of course. However if you are referring to the possibility of a 51% percent attack because of mining centralization. Then it is still to early to tell, we have to wait and see how it is going to play out. whether the network will successfully balance out due to game theory ect.