Bitcoin is the first decentralized, open source cryptocurrency that runs on a global peer to peer network, without the need for middlemen and a centralized issuer.

bitcoin (Wikipedia)
Bitcoin
Bitcoin logo.svg
Prevailing bitcoin logo
ISO 4217
Code XBT
Denominations
Subunit
11000 millibitcoin
1100000000 satoshi
Symbol
 satoshi sat
Coins Unspent outputs of transactions denominated in any multiple of satoshis
Demographics
Date of introduction 3 January 2009; 8 years ago (2009-01-03)
User(s) Worldwide
Issuance
Administration Decentralized
Valuation
Supply growth 12.5 bitcoins per block (approximately every ten minutes) until mid 2020, and then afterwards 6.25 bitcoins per block for 4 years until next halving. This halving continues until 2110–40, when 21 million bitcoins will have been issued.
Bitcoin explained in 3 minutes

Bitcoin is a worldwide cryptocurrency and digital payment system called the first decentralized digital currency, as the system works without a central repository or single administrator. It was invented by an unknown person or group of people under the name Satoshi Nakamoto and released as open-source software in 2009. The system is peer-to-peer, and transactions take place between users directly, without an intermediary. These transactions are verified by network nodes and recorded in a public distributed ledger called a blockchain.

Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies, products, and services. As of February 2015, over 100,000 merchants and vendors accepted bitcoin as payment. Bitcoin can also be held as an investment. According to research produced by Cambridge University in 2017, there are 2.9 to 5.8 million unique users using a cryptocurrency wallet, most of them using bitcoin.

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