₿" redirects here. It is not to be confused with "฿" for Thai baht.
Bitcoin
Prevailing bitcoin logo
Prevailing bitcoin logo
Denominations
Plural bitcoins
Symbol ₿ (Unicode: U+20BF ₿ BITCOIN SIGN (HTML ₿))[a]
Ticker symbol BTC, XBT[b]
Precision 10−8
Subunits
1⁄1000 millibitcoin
1⁄100000000 satoshi[2]
Free Dogecoin
DevelopmentOriginal author(s) Satoshi Nakamoto
White paper "Bitcoin: A Peer-to-Peer Electronic Cash System"[4]
Implementation(s) Bitcoin Core
Initial release 0.1.0 / 9 January 2009 (10 years ago)
Latest release 0.19.0.1 / 24 November 2019 (33 days ago)[3]
Development status Active
Website bitcoin.org
Ledger
Ledger start 3 January 2009 (10 years ago)
Timestamping scheme Proof-of-work (partial hash inversion)
Hash function SHA-256
Issuance schedule Decentralized (block reward)
Initially ₿50 per block, halved every 210,000 blocks[8][9]
Block reward ₿12.5[c]
Block time 10 minutes
Block explorer bitaps.com
Circulating supply ₿17,754,100 (as of 11 June 2019)
Supply limit ₿21,000,000[5][d]  |
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The symbol was encoded in Unicode version 10.0 at position U+20BF ₿ BITCOIN SIGN in the Currency Symbols block in June 2017.[1] Compatible with ISO 4217. July 2016 to approximately June 2020, halved approximately every four years The supply will approach, but never reach, ₿21 million. Issuance will permanently halt c. 2140 at ₿20,999,999.9769.[6][7]:ch. 8This article contains special characters. Without proper rendering support, you may see question marks, boxes, or other symbols.Bitcoin[a] (₿) is a cryptocurrency. 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.[8]
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