$BTC Bitcoin is a decentralized digital currency that was created in 2009 by an unknown person or group of people using the name Satoshi Nakamoto. Bitcoin relies on blockchain technology, which is a public network that records all transactions. Bitcoin is characterized by its limited supply, as no more than 21 million bitcoins can ever be created. Bitcoin is used as a means of payment and investment, and it enjoys great popularity worldwide. Bitcoin can be purchased through trading platforms or obtained through the mining process.