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Bitcoin () is a cryptocurrency, a form of electronic money. It is a decentralized electronic currency without a central bank or single administrator that can be sent out of user-to-user on the peer reviewed bitcoin network without the need for intermediaries.7
Transactions are confirmed by network nodes via cryptography and listed in a public dispersed ledger called a blockchain. Bitcoin was invented by an unknown person or group of individuals using the name Satoshi Nakamoto9 and released as open-source software in 2009.10 Bitcoins are made as a reward for a process known as mining.
Research generated by the University of Cambridge estimates that in 2017, there were 2.9 to 5.8 million unique users using a cryptocurrency wallet, most of them using bitcoin.12.
Bitcoin has been criticized for its use in prohibited transactions, its high electricity consumption, cost volatility, thefts from exchanges, and also the chance that bitcoin is an economic bubble.13 Bitcoin has also been utilized as an investment, although many regulatory agencies have issued investor alarms about bitcoin.14
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The domain name"bitcoin.org" was registered on 18 August 2008.15 On 31 October 2008, a link to a paper authored by Satoshi Nakamoto titled Bitcoin: A Peer-to-Peer Electronic Cash System5 was posted to a cryptography mailing list.16 Nakamoto implemented the bitcoin software as open-source code and released it in January 2009.171810 Nakamoto's identity remains unknown.9.
In January 2009, the bitcoin network was made when Nakamoto mined the first block of the chain, known as the genesis block.1920 Embedded in the coinbase of the block was the following text:"The Times 03/Jan/2009 Chancellor on brink of second bailout for banks. "10 This note has been interpreted as both a timestamp and a comment on the instability brought on by fractional-reserve banking.21:18.
The recipient of the first bitcoin transaction was cypherpunk Hal Finney, that made the very first reusable proof-of-work system (RPOW) in 2004.22 Finney downloaded the bitcoin applications on its release date, and on 12 January 2009 obtained ten bitcoins from Nakamoto.2324 Other ancient cypherpunk supporters were creators of bitcoin predecessors: Wei Dai, creator of b-money, and Nick Szabo, creator of bit golden.25 In 2010, the first known business transaction using bitcoin occurred when developer Laszlo Hanyecz purchased two Papa John's pizzas for 10,000 bitcoin.26.
Nakamoto is estimated to have mined one million bitcoins27 before disappearing in 2010, when he handed the network alert key and control of the code repository over to Gavin Andresen. Andresen later became lead developer at the Bitcoin Foundation.2829 Andresen then sought to decentralize control. This left opportunity for controversy to grow over the future development course of bitcoin.3029.
After early"proof-of-concept" transactions, the first significant consumers of bitcoin were black markets, for example Silk Road. During its 30 months of existence, beginning in February 2011, Silk Road exclusively accepted bitcoins as payment, transacting 9.9 million in bitcoins, worth roughly $214 million.31:222
In 2011, the price started try this site at $0.30 per bitcoin, growing to $5.27 for the year. The cost rose to $31.50 on 8 June. Within a month that the price fell to $11.00. The next month it dropped to $7.80, and in another month to $4.77.32
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Litecoin, an early bitcoin spin-off or altcoin, appeared in October 2011.33 Many altcoins have been created since then.34
In 2012, bitcoin prices started at $5.27 growing to $13.30 for the calendar year.32 By 9 January the cost had risen to $7.38, but then crashed by 49 percent to $3.80 within the next 16 days. The cost then rose to $16.41 on 17 August, but fell by 57% to $7.10 over the next three days.35.
In March 2013 the blockchain temporarily split into two independent chains with different rules. The two blockchains operated simultaneously for half an hour, each using its own version of the transaction history. Normal operation was restored when the vast majority of the network downgraded to version 0.7 of their bitcoin applications.37 The Mt.
Gox experienced processing delays due to insufficient capacity44 resulting in the bitcoin price dropping from $266 to $76 before returning to $160 within six hours.45 The bitcoin price rose to $259 on 10 April, but then dropped by 83% to $45 within the next 3 days.35 On 15 May 2013, US government seized accounts connected with Mt.
881.48 This marked the first time a government agency had captured bitcoin.4950 The FBI seized about 26,000 bitcoins in October 2013 from the dark web website Silk Road during the arrest of Ross William Ulbricht.515253 Bitcoin's cost rose to $755 on 19 November and crashed by 50% to $378 the exact same day.
In 2014, prices started at $770 and fell to $314 for the year.32 In February 2014 that the Mt. Gox exchange, the most significant bitcoin exchange in the time, stated that 850,000 bitcoins had been stolen from its own clients, amounting to almost $500 million. Bitcoin's price fell by almost half, from $867 to $439 (a 49% drop).