What is Quantum Computing and what the hell does it have to do with the end of crypto currency?? Bit computers can do alot but can only do so much as follow through a single defined process to the end. Qubit computers when ready will have abilities to follow through all the possibilities in the probability set. Cryptography has a catch. No computer yet can break an hash. Yet. Time will tell. I doubt when qubit computing is finally available that wont change.