币界网报道：This article reviews the current state of decentralization in the field of Bitcoin mining, focusing on the security concerns caused by the Ghash.io mining pool in 2014 due to its excessive share of computing power. Ghash.io once attracted a large number of miners due to its low fees and high-quality services, causing its computing power to approach 50%, which aroused the community's vigilance against the risk of 51% attacks. Subsequently, Ghash restricted the registration of new miners and encouraged users to disperse computing power, and was finally closed in 2015. At present, although multiple mining pools jointly control more than half of the computing power, the main problem is that the right to generate blocks is highly concentrated in a few mining pools, which poses a risk of government intervention. The DMND mining pool proposed to shift the responsibility for block generation from mining pools to actual computing power contributors to enhance decentralization and security. The article emphasizes that the Bitcoin protocol is the ultimate master of all miners and mining pools.