What I see, Bitcoin and Altcoin is safe, I don't think anyone can hack a cryptocurrency technology system and so far, there have been no cases of cryptocurrency being hacked. Those who are vulnerable to hacking are our exchanges and wallets. actually, it's not difficult to avoid this, the way is how you are responsible for maintaining your virtual assets and your wallet. One easy way that can be used is to limit each form of money in a certain amount. do not store eggs in one basket, so if bad things happen then we don't suffer too much .