Imagine this: you keep your bitcoins well protected as if they were a bank vault. Now, suddenly, a computer so intelligent that it can open this vault effortlessly appears, just to show off. It sounds like something out of science fiction, right? But that is exactly the fear with quantum computing and the future of Bitcoin.

Satoshi Nakamoto, the mysterious creator of Bitcoin, has been aware of this threat since 2010. He suggested two “plan Bs”:
1. Lock everything down before it goes wrong and start with new rules;