Bitcoin is a cryptocurrency and worldwide payment system. It is the first decentralized digital currency, as the system works without a central bank or single administrator.The network is peer-to-peer and transactions take place between users directly, without an intermediary.These transactions are verified by network nodes through the use of cryptography and recorded in a public distributed ledger called a blockchain. Bitcoin was invented by an unknown person or group of people under the name Satoshi Nakamoto and released as open-source software in 2009.
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. Research produced by the University of Cambridge estimates that 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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Altcoin ASIC/ASIC Miner Blockchain Distributed & Central Ledger Fork Hashrate Mining Node P2P Public/Private Key Signature Smart Contract 1 Bitcoin BTC 2 Ethereum ETH 3 Bitcoin Cash BCH 4 Ripple XRP 5 Litecoin LTC 6 Dash DASH 7 NEO NEO 8 IOTA MIOTA 9 Monero XMR 10 NEM XEM 11 Ethereum Classic ETC 12 Lisk LSK 13 Qtum QTUM 14 EOS EOS 15 Hshare HSR 16 Cardano ADA 17 OmiseGO OMG 18 Zcash ZEC