It seems that there will be a big thunderbolt in a few years. Currently, there are over 20 million circulating bitcoins, but in reality, many bitcoins have been lost, possibly due to the loss of private keys (the guy who is still digging hard drives) or the death of someone (Satoshi Nakamoto). Once quantum technology makes a breakthrough, it is necessary to quickly switch to anti quantum algorithms. Due to Bitcoin's decentralization, there were disagreements in the previous expansion war, resulting in the formation of two coins. In my impression, they argued for more than a year but still could not compromise with each other. This is similar to political forms. If it is very democratic, it is difficult to gather people to do things, and if it is authoritarian, it is easy to give orders. The advantage of decentralization also has obvious drawbacks. Even if they switch to anti quantum protocols, these computers will still calculate the valuable address private keys, that is, evaluate the cost and benefits they need to calculate. Fortunately, it may take several to ten years to face all of this.