Bitcoin is a cryptocurrency and a payment system[14]:3 invented by an unidentified programmer, or group of programmers, under the name of Satoshi Nakamoto.[15] Bitcoin was introduced on 31 October 2008 to a cryptography mailing list,[16] and released as open-source software in 2009.[17] There have been various claims and speculation concerning the identity of Nakamoto, none of which are confirmed.[15] The system is peer-to-peer and transactions take place between users directly, without an intermediary.[14]:4 These transactions are verified by network nodes and recorded in a public distributed ledger called the blockchain,[18] which uses bitcoin as its unit of account. Since the system works without a central repository or single administrator, the U.S. Treasury categorizes bitcoin as a decentralized virtual currency.[11] Bitcoin is often called the first cryptocurrency,[19][20][21] although prior systems existed[note 4] and it is more correctly described as the first decentralized digital currency.[14][25] Bitcoin is the largest of its kind in terms of total market value.[26]
Bitcoins are created as a reward in a competition in which users offer their computing power to verify and record bitcoin transactions into the blockchain. This activity is referred to as mining and successful miners are rewarded with transaction fees and newly created bitcoins.[14]:5–7 Besides being obtained by mining, bitcoins can be exchanged for other currencies,[27] products, and services.[28] When sending bitcoins, users can pay an optional transaction fee to the miners.[29] This may expedite the transaction being confirmed. You can read more at: Wikipedia Bitcoin
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