Friday, March 8, 2019

Bitcoin (₿)

Bitcoin (₿)
Bitcoin is a cryptocurrency, a form of electronic cash. It is a decentralized digital currency without a central bank or single administrator that can be sent from user to user on the peer-to-peer bitcoin network without the need for intermediaries.[7]
Bitcoin
Prevailing bitcoin logo
Prevailing bitcoin logo
Denominations
Pluralbitcoins
Symbol₿[a]
Ticker symbolBTC, XBT[b]
Subunits
 ​1⁄1000millibitcoin
 ​1⁄100000000satoshi[2]
CoinsUnspent outputs of transactions (in multiples of a satoshi)[3]:ch. 5
Development
Original author(s)Satoshi Nakamoto
White paper"Bitcoin: A Peer-to-Peer Electronic Cash System"[5]
Implementation(s)Bitcoin Core
Initial release0.1.0 / 9 January 2009(10 years ago)
Latest release0.17.1 / 25 December 2018 (2 months ago)[4]
Websitebitcoin.org
Ledger
Ledger start3 January 2009 (10 years ago)
Timestamping schemeProof-of-work (partial hash inversion)
Hash functionSHA-256
IssuanceDecentralized (block reward)[7][8]
Block reward₿12.5[c]
Block time10 minutes
Block explorerbitaps.com
Circulating supply₿17,560,833 (as of 27 February 2019)
Supply limit₿21,000,000[6]
  1. ^ The symbol was encoded in Unicode version 10.0 at position U+20BF ₿ BITCOIN SIGN in the Currency Symbols block in June 2017.[1]
  2. ^ Compatible with ISO 4217.
  3. ^ July 2016 to approximately June 2020, halved approximately every four years
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