Bitcoin is a payment system invented by Satoshi Nakamoto. He published the invention in 2008 and released it as open-source software in 2009. The system is peer-to-peer; users can transact directly without any middleman. The system works without a central repository or single administrator, which has led the US Treasury to categorize it as a decentralized virtual currency. Bitcoin is often called the first crypto currency. Bitcoin is better described as the first decentralized digital currency. It is the largest of its kind in terms of total market value. Bitcoin is an instrument of alternative finance, which has emerged outside of the traditional financial system.
Bitcoins are created as a reward for payment processing work in which users offer their computing power to verify and record payments into the public ledger. This activity is called mining and the miners are rewarded with transaction fees and newly created bitcoins. Besides mining, bitcoins can be obtained in exchange for different currencies, products, and services. Users can send and receive bitcoins for an optional transaction fee.