Bitcoin (₿) is a cryptocurrency created in January 2009, based on the ideas from a whitepaper published by a mysterious person under the pseudonym of Satoshi Nakamoto. Bitcoin is based on a public ledger where everyone can see and verify transactions by Bitcoin mining. There is no single decentralized authority, unlike other currencies in use.
The bitcoin.org domain was registered on August 18, 2008. The whitepaper was published in October, and the first block was mined on January 3, 2009. The Bitcoin price is volatile, and it soared as high as $19,665. Bitcoin can be acquired through mining, by investing computation power for block rewards, or by purchasing them from various exchanges. There are even Bitcoin ATMs, and it could soon become a valid currency for day-to-day use!