Bitcoin is a P2P form of digital currency. The currency system once had no more than 10.5 million in 4 years, and the total number will be permanently limited to 21 million thereafter. At the beginning of November this year, Bitcoin was around US$5,000. On December 17, Bitcoin exceeded the US$20,000 mark. On Christmas Day, it plummeted by US$7,000 to US$12,612, equivalent to RMB 82,541.

There are many reasons for the sudden rise and fall of Bitcoin. When Bitcoin was first issued in 2009, it was only 1 cent, and now it is 12,612 US dollars. Currently, approximately 1.6 billion people own Bitcoin, and more than 140,000 people have Bitcoin wallets. This number is growing rapidly, and since the number of Bitcoins is fixed, penetration and other good news will keep the price of Bitcoin rising. However, Bitcoin does not only rise but never fall. Factors such as CME and CBOE launching Bitcoin futures trading, tightening of policies in various countries, and theft of Bitcoin will also cause the decline of Bitcoin. However, no matter how the price of Bitcoin fluctuates now, it still seems too outrageous compared to the initial price.