Bitcoin: **Bitcoin** *"₿" redirects here. It is not to be confused with "฿" for* *Thai baht**.* https://en.m.wikipedia.org/wiki/Thai_baht **Bitcoin** (**₿**) 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.Transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a blockchain. The cryptocurrency was invented in 2008 by an unknown person or group of people using the name Satoshi Nakamura's. The currency began use in 2009 when its implementation was released as open-source soft https://en.m.wikipedia.org/wiki/Digital_currency https://en.m.wikipedia.org/wiki/Central_bank https://en.m.wikipedia.org/wiki/Bitcoin_network https://en.m.wikipedia.org/wiki/Node_(networking) https://en.m.wikipedia.org/wiki/Cryptography https://en.m.wikipedia.org/wiki/Distributed_ledger https://en.m.wikipedia.org/wiki/Blockchain https://en.m.wikipedia.org/wiki/Cryptocurrency https://en.m.wikipedia.org/wiki/Satoshi_Nakamoto https://en.m.wikipedia.org/wiki/Open-source_software BitcoinDenominationsPluralbitcoinsSymbol₿ (Unicode: U+20BF ₿ BITCOIN SIGN (HTML)[a]CodeBTC,[b] XBT[c]Precision10−8Subunits 1⁄1000millibitcoin 1⁄1000000microbitcoin 1⁄100000000satoshi DevelopmentOriginal author(s)Satoshi NakamotoWhite paper"Bitcoin: A Peer-to-Peer Electronic Cash System"]Implementation(s)Bitcoin CoreInitial release0.1.0 / 9 January 2009 (13 years ago)Latest release22.0 / 13 September 2021 (4 months ago) repositorygithub.com/bitcoin/bitcoinDevelopment statusActiveWebsitebitcoin.orgLedgerLedger start3 January 2009 (13 years ago)Timestamping schemeProof-of-work (partial hash inversion)Hash functionSHA-256 (two rounds)Issuance scheduleDecentralized (block reward) Initially ₿50 per block, halved every 210,000 blocks]Block reward₿6.25 d]Block time10 minutesCirculating supply₿18,925,000[e]Supply limit₿21,000,000 [f]ValuationExchange rateFloatingMarket cap>US$775 billion[g]DemographicsOfficial user(s) El Salvador[8] https://en.m.wikipedia.org/wiki/Currency_symbol https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-2 https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-3 https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-4 https://en.m.wikipedia.org/wiki/Satoshi_Nakamoto https://en.m.wikipedia.org/wiki/White_paper https://bitcoin.org/bitcoin.pdf https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-paper-7 https://en.m.wikipedia.org/wiki/Software_release_life_cycle https://en.m.wikipedia.org/wiki/Repository_(version_control) https://github.com/bitcoin/bitcoin https://en.m.wikipedia.org/wiki/Trusted_timestamping https://en.m.wikipedia.org/wiki/Proof-of-work_system https://en.m.wikipedia.org/wiki/Hash_function https://en.m.wikipedia.org/wiki/SHA-256 https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-JSC-13 https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-8 https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-9 https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-12 https://en.m.wikipedia.org/wiki/Exchange_rate https://en.m.wikipedia.org/wiki/Market_capitalization https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-14 https://en.m.wikipedia.org/wiki/El_Salvador https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-BTCSVSept7FT-15 **^** The symbol was encoded in Unicode version 10.0 at position U+20BF ₿ BITCOIN SIGN in the Currency Symbols block in June 2017. https://en.m.wikipedia.org/wiki/Bitcoin#cite_ref-2 https://en.m.wikipedia.org/wiki/Unicode https://en.m.wikipedia.org/wiki/Currency_Symbols_(Unicode_block) **^** Very early software versions used the code "BC". https://en.m.wikipedia.org/wiki/Bitcoin#cite_ref-3 **^** Compatible with ISO 4217. https://en.m.wikipedia.org/wiki/Bitcoin#cite_ref-4 **^** May 2020 to approximately 2024, halved approximately every four years https://en.m.wikipedia.org/wiki/Bitcoin#cite_ref-8 **^** As of 2022-01-10 https://en.m.wikipedia.org/wiki/Bitcoin#cite_ref-9 **^** The supply will approach, but never reach, ₿21 million. Issuance will permanently halt c. 2140 at ₿20,999,999.9769 https://en.m.wikipedia.org/wiki/Bitcoin#cite_ref-12 **^** As of 2022-01-10 https://en.m.wikipedia.org/wiki/Bitcoin#cite_ref-14 **This article contains** **special characters****.** Without proper rendering support, you may see question marks, boxes, or other symbols. https://en.m.wikipedia.org/wiki/Help:Special_characters https://en.m.wikipedia.org/wiki/Specials_(Unicode_block)#Replacement_character Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies, products, and services. Bitcoin has been criticized for its use in illegal transactions, the large amount of electricity (and thus carbon footprint) used by mining, price volatility, and thefts from exchanges. Some investors and economists have characterized it as a speculative bubble at various times. Others have used it as an investment, although several regulatory agencies have issued investor alerts about bitcoin.[11][12][13] In September 2021, El Salvador officially adopted Bitcoin as legal tender, in the face of internal and international criticism, becoming the first nation to do so. https://en.m.wikipedia.org/wiki/Bitcoin#Mining https://en.m.wikipedia.org/wiki/Carbon_footprint https://en.m.wikipedia.org/wiki/Volatility_(finance) https://en.m.wikipedia.org/wiki/Speculative_bubble https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-:1-18 https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-CFTC_bitcoin-19 https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-20 https://en.m.wikipedia.org/wiki/El_Salvador https://en.m.wikipedia.org/wiki/Bitcoin_Law The word *bitcoin* was defined in a white paper published on 31 October 2008. It is a compound of the words *bit* and *coin*. No uniform convention for *bitcoin* capitalization exists; some sources use *Bitcoin*, capitalized, to refer to the technology and network and *bitcoin*, lowercase, for the unit of account. *The Wall Street Journal*,[18] *The Chronicle of Higher Education*,[19] and the *Oxford English Dictionary*[16] advocate the use of lowercase *bitcoin* in all cases. https://en.m.wikipedia.org/wiki/White_paper https://en.m.wikipedia.org/wiki/Compound_(linguistics) https://en.m.wikipedia.org/wiki/Bit https://en.m.wikipedia.org/wiki/Coin https://en.m.wikipedia.org/wiki/Computer_network https://en.m.wikipedia.org/wiki/The_Wall_Street_Journal https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-25 https://en.m.wikipedia.org/wiki/The_Chronicle_of_Higher_Education https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-26 https://en.m.wikipedia.org/wiki/Oxford_English_Dictionary https://en.m.wikipedia.org/wiki/Bitcoin#cite_note-btox-23