Cryptocurrency is a medium of exchange created according to the principles of cryptography to ensure transaction security and transaction unit control.

Cryptocurrencies are based on decentralized consensus mechanisms. Compared with the banking and financial system that relies on a centralized regulatory system, cryptocurrency has become the darling of capital in the 21st century due to its high degree of anonymity, decentralization and immutability, and has been highly recognized by the global market.

BTC became the first decentralized cryptocurrency in 2009, and was officially included in the commodity category by the US Commodity Futures Trading Commission (CFTC) in 2015 along with other virtual currencies. At the end of 2020, under the influence of the global pandemic, the government currencies of various countries continued to overissue, triggering a super bull market for cryptocurrencies, and BTC thus became the sixth largest currency in circulation in the world. The following year, the government of El Salvador officially declared BTC its national legal tender.