Why no one can track down the hackers who stole around $500million worth of NEM from japanese exchange. how do you keep your cryptocurrency?
Exchange broken has nothing to do with cryptocurrency safety. It is the same as asking how gold is safe after a bang has been robbed. It is better to keep your cryptocurrency in the hard wallet or on a distributed exchange, probably.
To keep cryptocurrency is to save it to online exchange, In online cryptocurrency wallet, cryptocurrency purse software (for example in your PC), With a hardware purse this storage method is the one I think is safest to use because the hacker will not be able to hit physical buttons in hardware you to provide transaction approval, if the hardware is lost then it can be imported.