in 2020, a Chinese Bitcoin mining pool called Lubian was reportedly hacked and lost control of an enormous sum—127,426 Bitcoin (BTC). To put that in context, even at average historic prices, this represents billions of dollars. What makes this story dramatic is that the stolen Bitcoin still sits untouched on the blockchain—meaning the hacker(s) haven't tried to launder or spend it. This is like a digital equivalent of a huge, locked safe whose key is lost or held by a thief waiting for the right moment.
