If you want all the computers that are now joining the mine to dig into the mine and dig into a lot of mines, you need to verify the random number as soon as possible. When verifying random numbers, there will be many, many random numbers to be verified, for example, these computers in the same mine, then will be in a pool to verify some random numbers, that is, each computer at the same time to verify different random numbers, the probability of cracking out of random numbers will be higher. As the probability of random number cracking increases, so does the benefits to all miners in the mine, which is why large mines have emerged. But CPU mining has many flaws. Because CPU computing power is limited, other miners can use more advanced computing power to verify random numbers, so using CPU to mine is increasingly impossible, such as Bitcoin miners simply do not know how Bitcoin works to dig with CPU, they can get a very low rate of return on mining.