Crypto-security

The security is the worst at its centralized points, like exchanges. But blockchain does do security really well (this becomes less true with complexity, see ethereums smart contracts) bc decentralization means it's not just one point of failure, it's many hundreds. So you'd have to really win the encryption arms race, by a lot, enough to beat all the miners securing the system. In proof of stake, it could even be more secure because in order to attack the system, you need to risk an amazing amount of money as a stake. [MacVogt19]