This is the number of bitcoins mined each year for Bitcoin. The starting point for Chinese mining was in 2011, and the abundant mining period was from 2012 to 2013. Two generations of mining machines emerged, reducing dimensional mining. Avalon and Roast Cat once accounted for 30%++of the entire network, and there was a large miner who mined hundreds of bitcoins every day. In 2015, the Bixin mine once accounted for 10% of the entire network (mainly because no one was digging at that time, only hard bones like Bixin were willing to invest). Even so, they had to sell more than half of their electricity bills every day, leaving little left. Later, they entered the era of the dominant player in Bitmain, and in 2019, BitMicro emerged again, with competition becoming increasingly fierce. In 2021, miners and mining machines went global. Those who have Bitcoin know that every Bitcoin is hard-earned, and it is even more difficult to survive for over a decade.