China's central bank banned all cryptocurrency transactions and mining activities in the country, causing a significant drop in the value of Bitcoin and other cryptocurrencies.
El Salvador became the first country to adopt Bitcoin as legal tender, allowing its citizens to use the cryptocurrency to pay for goods and services.
The US Securities and Exchange Commission (SEC) delayed its decision on approving a Bitcoin exchange-traded fund (ETF) proposed by VanEck.
The value of Ethereum, the second-largest cryptocurrency by market capitalization, surpassed $4,000 for the first time.
Tesla CEO Elon Musk announced that the company would no longer accept Bitcoin as payment for its electric vehicles due to concerns about the environmental impact of cryptocurrency mining.
The US government seized $2.3 million worth of cryptocurrency used to pay the ransomware attackers who hacked the Colonial Pipeline in May 2021.
The cryptocurrency exchange Coinbase went public through a direct listing on the NASDAQ stock exchange, with a valuation of over $100 billion.
The Financial Action Task Force (FATF) issued new guidelines for regulating cryptocurrency exchanges, requiring them to comply with anti-money laundering and counter-terrorism financing regulations.
The price of Dogecoin, a cryptocurrency that started as a joke but gained popularity among retail investors, experienced a significant surge in value, driven in part by tweets from Elon Musk.
The People's Bank of China announced that it was developing a digital version of its currency, the yuan, which would be a central bank digital currency (CBDC) that could be used for online transactions.