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A digital asset maintained by a decentralized system that records and verifies transactions using cryptography
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From Wikipedia, the free encyclopedia
"₿" redirects here. Not to be confused with "฿" for Thai baht .

^ The symbol was encoded in Unicode version 10.0 at position U+20BF ₿ BITCOIN SIGN in the Currency Symbols block in June 2017. [1]

^ Very early software versions used the code "BC".

^ Compatible with ISO 4217.

^ May 2020 to approximately 2024, halved approximately every four years

^ As of 2022-01-10

^ The supply will approach, but never reach, ₿21 million. Issuance will permanently halt c. 2140 at ₿20,999,999.9769. [6] : ch. 8

Number of bitcoin transactions per month, semilogarithmic plot [23]
Early bitcoin miners used GPUs for mining , as they were better suited to the proof-of-work algorithm than CPUs . [37]
Later amateurs mined bitcoins with specialized FPGA and ASIC chips. The chips pictured have become obsolete due to increasing difficulty.
Today, bitcoin mining companies dedicate facilities to housing and operating large amounts of high-performance mining hardware. [38]
For broader coverage of this topic, see Cryptocurrency wallet .
A paper wallet with a banknote -like design. Both the private key and the address are visible in text form and as 2D barcodes .
A paper wallet with the address visible for adding or checking stored funds. The part of the page containing the private key is folded over and sealed.
A brass token with a private key hidden beneath a tamper-evident security hologram . A part of the address is visible through a transparent part of the hologram.
A hardware wallet peripheral which processes bitcoin payments without exposing any credentials to the computer.
Bitcoin logos made by Satoshi Nakamoto in 2009 (left) and 2010 (right) depict bitcoins as gold tokens
Further information: Crypto-anarchism
Price in US$, semilogarithmic plot. [24]
The start screen under Fedora Linux

^ As of 2014 [update] , BTC is a commonly used code. It does not conform to ISO 4217 as BT is the country code of Bhutan, and ISO 4217 requires the first letter used in global commodities to be 'X'.

^ As of 2014 [update] , XBT, a code that conforms to ISO 4217 though is not officially part of it, is used by Bloomberg L.P. , [18] CNNMoney , [19] and xe.com . [20]

^ The genesis block is block number 0. The timestamp of the block is 2009-01-03 18:15:05. This block is unlike all other blocks in that it does not have a previous block to reference.

^ Bitcoin uses a custom elliptic curve called " secp256k1 " with the ECDSA algorithm to produce signatures . The equation for this curve is y 2 =x 3 +7 . [30] A proposed upgrade that would add support for Schnorr signatures is in development. [31] : 101

^ Relative mining difficulty is defined as the ratio of the difficulty target on 9 January 2009 to the current difficulty target.

^ It is misleading to think that there is an analogy between gold mining and bitcoin mining. The fact is that gold miners are rewarded for producing gold, while bitcoin miners are not rewarded for producing bitcoins; they are rewarded for their record-keeping services. [39]

^ The system used is based on Adam Back 's 1997 anti- spam scheme, Hashcash . [40] [ failed verification ] [4]

^ The exact number is 20,999,999.9769 bitcoins. [6] : ch. 8

^ The private key can be printed as a series of letters and numbers , a seed phrase , or a 2D barcode . Usually, the public key or bitcoin address is also printed, so that a holder of a paper wallet can check or add funds without exposing the private key to a device.

^ According to some reports, the law was approved on 8 June. [159] [160] [161] According to others, it was approved on 9 June. [162] [163] [164] The law was voted during the 8 June parliamentary session, and published in the official journal on 9 June. [165] [166]

^ Jump up to: a b "Unicode 10.0.0" . Unicode Consortium. 20 June 2017. Archived from the original on 20 June 2017 . Retrieved 20 June 2017 .

^ Jump up to: a b Mick, Jason (12 June 2011). "Cracking the Bitcoin: Digging Into a $131M USD Virtual Currency" . Daily Tech. Archived from the original on 20 January 2013 . Retrieved 30 September 2012 .

^ "Bitcoin Core 23.0" . Retrieved 31 May 2022 .

^ Jump up to: a b c d e f Nakamoto, Satoshi (31 October 2008). "Bitcoin: A Peer-to-Peer Electronic Cash System" (PDF) . bitcoin.org. Archived (PDF) from the original on 20 March 2014 . Retrieved 28 April 2014 .

^ Nakamoto; et al. (1 April 2016). "Bitcoin source code – amount constraints" . GitHub . Archived from the original on 1 July 2018.

^ Jump up to: a b c d e f g h i j k l m n o p q r s t u v w x y z aa Antonopoulos, Andreas M. (2014). Mastering Bitcoin: Unlocking Digital Crypto-Currencies . O'Reilly Media. ISBN 978-1-4493-7404-4 .

^ Jump up to: a b c d e "Statement of Jennifer Shasky Calvery, Director Financial Crimes Enforcement Network United States Department of the Treasury Before the United States Senate Committee on Banking, Housing, and Urban Affairs Subcommittee on National Security and International Trade and Finance Subcommittee on Economic Policy" (PDF) . fincen.gov . Financial Crimes Enforcement Network. 19 November 2013. Archived (PDF) from the original on 9 October 2016 . Retrieved 1 June 2014 .

^ Jump up to: a b "El Salvador's dangerous gamble on bitcoin" . The editorial board. Financial Times . 7 September 2021 . Retrieved 7 September 2021 . On Tuesday, the small Central American nation became the first in the world to adopt bitcoin as an official currency.

^ Jump up to: a b "Bitcoin Declared Legal Currency in Central African Republic" . Bloomberg.com . 28 April 2022 . Retrieved 28 April 2022 .

^ Jump up to: a b S., L. (2 November 2015). "Who is Satoshi Nakamoto?" . The Economist . The Economist Newspaper Limited. Archived from the original on 21 August 2016 . Retrieved 23 September 2016 .

^ Jump up to: a b c d e Davis, Joshua (10 October 2011). "The Crypto-Currency: Bitcoin and its mysterious inventor" . The New Yorker . Archived from the original on 1 November 2014 . Retrieved 31 October 2014 .

^ Jump up to: a b c Wolff-Mann, Ethan (27 April 2018). " 'Only good for drug dealers': More Nobel prize winners snub bitcoin" . Yahoo Finance . Archived from the original on 12 June 2018 . Retrieved 7 June 2018 .

^ Vigna, Paul; Casey, Michael J. (2015). The Age of Cryptocurrency: How Bitcoin and Digital Money Are Challenging the Global Economic Order (1 ed.). New York: St. Martin's Press. ISBN 978-1-250-06563-6 .

^ Jump up to: a b "bitcoin" . OxfordDictionaries.com . Archived from the original on 2 January 2015 . Retrieved 28 December 2014 .

^ Bustillos, Maria (2 April 2013). "The Bitcoin Boom" . The New Yorker . Condé Nast. Archived from the original on 27 July 2014 . Retrieved 22 December 2013 . Standards vary, but there seems to be a consensus forming around Bitcoin, capitalized, for the system, the software, and the network it runs on, and bitcoin, lowercase, for the currency itself.

^ Vigna, Paul (3 March 2014). "BitBeat: Is It Bitcoin, or bitcoin? The Orthography of the Cryptography" . WSJ . Archived from the original on 19 April 2014 . Retrieved 21 April 2014 .

^ Metcalf, Allan (14 April 2014). "The latest style" . Lingua Franca blog. The Chronicle of Higher Education (chronicle.com). Archived from the original on 16 April 2014 . Retrieved 19 April 2014 .

^ Romain Dillet (9 August 2013). "Bitcoin Ticker Available On Bloomberg Terminal For Employees" . TechCrunch . Archived from the original on 1 November 2014 . Retrieved 2 November 2014 .

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^ "XBT – Bitcoin" . xe.com. Archived from the original on 2 November 2014 . Retrieved 2 November 2014 .

^ "Regulation of Bitcoin in Selected Jurisdictions" (PDF) . The Law Library of Congress, Global Legal Research Center. January 2014. Archived (PDF) from the original on 14 October 2014 . Retrieved 26 August 2014 .

^ Katie Pisa & Natasha Maguder (9 July 2014). "Bitcoin your way to a double espresso" . cnn.com . CNN. Archived from the original on 18 June 2015 . Retrieved 23 April 2015 .

^ Jump up to: a b "Blockchair" . Blockchair.com . Archived from the original on 13 October 2019 . Retrieved 13 October 2019 .

^ Jump up to: a b c d "Charts" . Blockchain.info . Archived from the original on 3 November 2014 . Retrieved 2 November 2014 .

^ Jump up to: a b c d e f "The great chain of being sure about things" . The Economist . The Economist Newspaper Limited. 31 October 2015. Archived from the original on 3 July 2016 . Retrieved 3 July 2016 .

^ Jump up to: a b c d e f g h Rainer Böhme; Nicolas Christin; Benjamin Edelman; Tyler Moore (2015). "Bitcoin: Economics, Technology, and Governance" . Journal of Economic Perspectives . 29 (2): 213–238. doi : 10.1257/jep.29.2.213 .

^ Sparkes, Matthew (9 June 2014). "The coming digital anarchy" . The Daily Telegraph . London. Archived from the original on 23 January 2015 . Retrieved 7 January 2015 .

^ Jump up to: a b c d e Joshua A. Kroll; Ian C. Davey; Edward W. Felten (11–12 June 2013). "The Economics of Bitcoin Mining, or Bitcoin in the Presence of Adversaries" (PDF) . The Twelfth Workshop on the Economics of Information Security (WEIS 2013) . Archived (PDF) from the original on 9 May 2016 . Retrieved 26 April 2016 . A transaction fee is like a tip or gratuity left for the miner.

^ Orcutt, Mike (19 May 2015). "Leaderless Bitcoin Struggles to Make Its Most Crucial Decision" . MIT Technology Review . Archived from the original on 18 October 2017 . Retrieved 22 June 2017 .

^ Houria, Azine; Mohamed Abdelkader, Bencherif; Abderezzak, Guessoum (1 March 2019). "A comparison between the secp256r1 and the koblitz secp256k1 bitcoin curves". Indonesian Journal of Electrical Engineering and Computer Science . 13 (3): 910. doi : 10.11591/ijeecs.v13.i3.pp910-918 . S2CID 196058538 .

^ Van Hijfte, Stijn (2020). Blockchain Platforms: A Look at the Underbelly of Distributed Platforms . Morgan & Claypool Publishers. ISBN 978-1681738925 .

^ "Man Throws Away 7,500 Bitcoins, Now Worth $7.5 Million" . CBS DC . 29 November 2013. Archived from the original on 15 January 2014 . Retrieved 23 January 2014 .

^ Krause, Elliott (5 July 2018). "A Fifth of All Bitcoin Is Missing. These Crypto Hunters Can Help" . The Wall Street Journal . Archived from the original on 9 July 2018 . Retrieved 8 July 2018 .

^ Jump up to: a b Jeffries, Adrianne (19 December 2013). "How to steal Bitcoin in three easy steps" . The Verge . Archived from the original on 27 July 2019 . Retrieved 17 January 2014 .

^ Harney, Alexandra; Stecklow, Steve (16 November 2017). "Twice burned – How Mt. Gox's bitcoin customers could lose again" . Reuters . Archived from the original on 29 August 2019 . Retrieved 6 September 2018 .

^ Martindale, Jon (16 March 2018). "Who owns all the Bitcoin? A few billionaire whales in a small pond" . Digital Trends . Archived from the original on 30 June 2019 . Retrieved 1 July 2019 .

^ "Bitcoin mania is hurting PC gamers by pushing up GPU prices" . 30 January 2018. Archived from the original on 2 February 2018 . Retrieved 2 February 2018 .

^ "Cryptocurrency mining operation launched by Iron Bridge Resources" . World Oil . 26 January 2018. Archived from the original on 30 January 2018.

^ Jump up to: a b Andolfatto, David (31 March 2014). "Bitcoin and Beyond: The Possibilities and Pitfalls of Virtual Currencies" (PDF) . Dialogue with the Fed . Federal Reserve Bank of St. Louis. Archived (PDF) from the original on 9 April 2014 . Retrieved 16 April 2014 .

^ Sherman, Alan; Javani, Farid; Golaszewski, Enis (25 March 2019). "On the Origins and Variations of Blockchain Technologies". IEEE Security & Privacy . 17 (1): 72–77. arXiv : 1810.06130 . doi : 10.1109/MSEC.2019.2893730 . S2CID 53114747 .

^ "Difficulty History" (The ratio of all hashes over valid hashes is D x 4,295,032,833, where D is the published "Difficulty" figure.). Blockchain.info. Archived from the original on 8 April 2015 . Retrieved 8 April 2022 .

^ "Bitcoin boom benefiting TSMC: report" . Taipei Times . 4 January 2014.

^ Hampton, Nikolai (5 September 2016). "Understanding the blockchain hype: Why much of it is nothing more than snake oil and spin" . Computerworld . IDG. Archived from the original on 6 September 2016 . Retrieved 5 September 2016 .

^ Biggs, John (8 April 2013). "How To Mine Bitcoins" . Techcrunch. Archived from the original on 6 July 2017.

^ Jump up to: a b Ashlee Vance (14 November 2013). "2014 Outlook: Bitcoin Mining Chips, a High-Tech Arms Race" . BusinessWeek . Archived from the original on 21 November 2013 . Retrieved 24 November 2013 .

^ Browne, Ryan (11 May 2020). "Bitcoin investors are bracing for a key technical event — here's what you need to know" . CNBC .

^ Ritchie S. King; Sam Williams; David Yanofsky (17 December 2013). "By reading this article, you're mining bitcoins" . qz.com . Atlantic Media Co. Archived from the original on 17 December 2013 . Retrieved 17 December 2013 .

^ Meola, Andrew (5 October 2017). "How distributed ledger technology will change the way the world works" . Business Insider . Archived from the original on 27 April 2018 . Retrieved 26 July 2018 .

^ Jerry Brito & Andrea Castillo (2013). "Bitcoin: A Primer for Policymakers" (PDF) . Mercatus Center . George Mason University . Archived (PDF) from the original on 21 September 2013 . Retrieved 22 October 2013 .

^ Tschorsch, Florian; Scheuermann, Björn (2016). "Bitcoin and Beyond: A Technical Survey on Decentralized Digital Currencies". IEEE Communications Surveys & Tutorials . 18 (3): 2084–2123. doi : 10.1109/comst.2016.2535718 . S2CID 5115101 .

^ Beikverdi, A.; Song, J. (2015). Trend of centralization in Bitcoin's distributed network . 2015 IEEE/ACIS 16th International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD) . pp. 1–6. doi : 10.1109/SNPD.2015.7176229 . ISBN 978-1-4799-8676-7 . S2CID 15516195 .

^ Jump up to: a b c Gervais, Arthur; Karame, Ghassan O.; Capkun, Vedran; Capkun, Srdjan. "Is Bitcoin a Decentralized Currency?" . InfoQ . InfoQ & IEEE Computer Society . Archived from the original on 10 October 2016 . Retrieved 11 October 2016 .

^ Wilhelm, Alex. "Popular Bitcoin Mining Pool Promises To Restrict Its Compute Power To Prevent Feared '51%' Fiasco" . TechCrunch . Archived from the original on 5 December 2017 . Retrieved 25 January 2018 .

^ Chan, Edwin (9 April 2019). "China Plans to Ban Cryptocurrency Mining in Renewed Clampdown" . Bloomberg.com . Archived from the original on 18 December 2019 . Retrieved 10 April 2019 . While China was once home to about 70 percent of Bitcoin mining and 90 percent of trades, authorities have waged a nearly two-year campaign to shrink the crypto industry amid concerns over speculative bubbles, fraud and wasteful energy consumption.

^ Simonite, Tom (5 September 2013). "Mapping the Bitcoin Economy Could Reveal Users' Identities" . MIT Technology Review . Retrieved 2 April 2014 .

^ Lee, Timothy (21 August 2013). "Five surprising facts about Bitcoin" . The Washington Post . Archived from the original on 12 October 2013 . Retrieved 2 April 2014 .

^ McMillan, Robert (6 June 2013). "How Bitcoin lets you spy on careless companies" . Wired UK . Conde Nast. Archived from the original on 9 February 2014 . Retrieved 3 April 2020 .

^ Ben-Sasson, Eli; Chiesa, Alessandro; Garman, Christina; Green, Matthew; Miers, Ian; Tromer, Eran; Virza, Madars (2014). "Zerocash: Decentralized Anonymous Payments from Bitcoin" (PDF) . 2014 IEEE Symposium on Security and Privacy . IEEE computer society. Archived (PDF) from the original on 14 October 2014 . Retrieved 31 October 2014 .

^ Möser, Malte; Böhme, Rainer; Breuker, Dominic (2013). An Inquiry into Money Laundering Tools in the Bitcoin Ecosystem (PDF) . 2013 APWG eCrime Researchers Summit. IEEE . ISBN 978-1-4799-1158-5 . Archived (PDF) from the original on 26 June 2018 . Retrieved 19 June 2019 .

^ Adam Serwer & Dana Liebelson (10 April 2013). "Bitcoin, Explained" . motherjones.com . Mother Jones. Archived from the original on 27 April 2014 . Retrieved 26 April 2014 .

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^ Skudnov, Rostislav (2012). Bitcoin Clients (PDF) (Bachelor's Thesis). Turku University of Applied Sciences . Archived (PDF) from the original on 18 January 2014 . Retrieved 16 January 2014 .

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^ Metz, Cade (19 August 2015). "The Bitcoin Schism Shows the Genius of Open Source" . Wired . Condé Nast. Archived from the original on 30 June 2016 . Retrieved 3 July 2016 .

^ Jump up to: a b Vigna, Paul (17 January 2016). "Is Bitcoin Breaking Up?" . The Wall Street Journal . Archived from the original on 20 August 2016 . Retrieved 8 November 2016 .

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