Satoshi Nakamoto is the name used by the unknown person or persons who designed bitcoin and created its original reference implementation, Bitcoin Core. As a part of the implementation, they also devised the first blockchain database. In the process they were the first to solve the double spending problem for digital currency. They were active in the development of bitcoin up until December 2010.
Nakamoto has claimed to be a man living in Japan, born around 1975. However, speculation about the true identity of Nakamoto has mostly focused on a number of cryptography and computer science experts of non-Japanese descent, living in the United States and Europe. One person, Australian programmer Craig Steven Wright, has claimed to be Nakamoto, though he has not yet offered proof of this.
As of 10 December 2016, Nakamoto owns roughly one million bitcoins, with a value estimated at over US$895million.
In October 2008, Nakamoto published a paper on The Cryptography Mailing list at metzdowd.com describing the bitcoin digital currency. It was titled Bitcoin: A Peer-to-Peer Electronic Cash System. In January 2009, Nakamoto released the first bitcoin software that launched the network and the first units of the bitcoin cryptocurrency, called bitcoins. Satoshi Nakamoto released the bitcoin software on Sourceforge on 9 January 2009. Version 0.1 was compiled using Microsoft Visual Studio.
They claim that work on the writing of the code began in 2007. The inventor of bitcoin knew that due to its nature the core design would have to be able to support a broad range of transaction types. The implemented solution enabled specialised codes and data fields from the start through the use of a predicative script.
Nakamoto created a website with the domain name bitcoin.org and continued to collaborate with other developers on the bitcoin software until mid-2010. Around this time, he handed over control of the source code repository and network alert key to Gavin Andresen, transferred several related domains to various prominent members of the bitcoin community, and stopped his involvement in the project. Until shortly before his absence and handover Nakamoto made all modifications to the source code themselves.
The inventor left a text message in the first mined block which reads 'The Times 03/Jan/2009 Chancellor on brink of second bailout for banks'. The text refers to a headline in the Financial Times published on 3 January 2009. It is a strong indication that the first block was mined no earlier than this date. The genesis block has a timestamp of 18:15:05 GMT on January 3 2009. This block is unlike all other blocks in that it doesn't have previous block to reference. This required the use of custom code to mine it. Timestamps for subsequent blocks indicate that Nakamoto did not try to mine all the early blocks solely for themselves in an effort to benefit from a ponzi scheme.
As the sole, predominate early miner the inventor was awarded bitcoin at genesis and for 10 days afterwards. Except for test transactions these remain unspent since mid January 2009. The public bitcoin transaction log shows that Nakamoto's known addresses contain roughly one million bitcoins. As of 10 December 2016[update], this is the equivalent of around US$895 million.
Nakamoto did not disclose any personal information when discussing technical matters. They provided some commentary on banking and fractional reserve lending. On his P2P Foundation profile as of 2012, Nakamoto claimed to be a 37-year-old male who lived in Japan, but some speculated he was unlikely to be Japanese due to his use of perfect English and his bitcoin software not being documented or labelled in Japanese.
Occasional British English spelling and terminology (such as the phrase "bloody hard") in both source code comments and forum postings led to speculation that Nakamoto, or at least one individual in the consortium claiming to be him, was of Commonwealth origin.
Stefan Thomas, a Swiss coder and active community member, graphed the time stamps for each of Nakamoto's bitcoin forum posts (more than 500); the resulting chart showed a steep decline to almost no posts between the hours of 5 a.m. and 11 a.m. Greenwich Mean Time. Because this pattern held true even on Saturdays and Sundays, it suggested that Nakamoto was asleep at this time. If Nakamoto is a single individual with conventional sleeping habits, it suggests he resided in a region using the UTC05:00 or UTC06:00 time offset. This includes the parts of North America that fall within the Eastern Time Zone and Central Time Zone, as well as parts of Central America, the Caribbean and South America.
Gavin Andresen has said of Nakamoto's code "He was a brilliant coder, but it was quirky".
There is still doubt about the real identity of Satoshi Nakamoto.
In December 2013, a blogger named Skye Grey linked Nick Szabo to the bitcoin whitepaper using a stylometric analysis. Szabo is a decentralized currency enthusiast and published a paper on "bit gold", which is considered a precursor to bitcoin. He is known to have been interested in using pseudonyms in the 1990s. In a May 2011 article, Szabo stated about the bitcoin creator: "Myself, Wei Dai, and Hal Finney were the only people I know of who liked the idea (or in Dai's case his related idea) enough to pursue it to any significant extent until Nakamoto (assuming Nakamoto is not really Finney or Dai)."
Detailed research by financial author Dominic Frisby provides much circumstantial evidence but, as he admits, no proof that Satoshi is Szabo. Speaking on RT's The Keiser Report, he said "I've concluded there is only one person in the whole world that has the sheer breadth but also the specificity of knowledge and it is this chap...". But Szabo has denied being Satoshi. In a July 2014 email to Frisby, he said: 'Thanks for letting me know. I'm afraid you got it wrong doxing me as Satoshi, but I'm used to it'. Nathaniel Popper wrote in the New York Times that "the most convincing evidence pointed to a reclusive American man of Hungarian descent named Nick Szabo."
In a high-profile March 6, 2014, article in the magazine Newsweek, journalist Leah McGrath Goodman identified Dorian Prentice Satoshi Nakamoto, a Japanese American man living in California, whose birth name is Satoshi Nakamoto, as the Nakamoto in question. Besides his name, Goodman pointed to a number of facts that circumstantially suggested he was the bitcoin inventor. Trained as a physicist, Nakamoto worked as a systems engineer on classified defense projects and computer engineer for technology and financial information services companies. Nakamoto was laid off twice in the early 1990s and turned libertarian, according to his daughter, and encouraged her to start her own business and "not be under the government's thumb." In the article's seemingly biggest piece of evidence, Goodman wrote that when she asked him about bitcoin during a brief in-person interview, Nakamoto seemed to confirm his identity as the bitcoin founder by stating: "I am no longer involved in that and I cannot discuss it. It's been turned over to other people. They are in charge of it now. I no longer have any connection." (This quote was later confirmed by deputies at the Los Angeles County Sheriff's Department who were present at the time.)
The article's publication led to a flurry of media interest, including reporters camping out near Dorian Nakamoto's house and briefly chasing him by car when he drove to an interview. However, during the subsequent full-length interview, Dorian Nakamoto denied all connection to bitcoin, saying he had never heard of the currency before, and that he had misinterpreted Goodman's question as being about his previous work for military contractors, much of which was classified. Later that day, the pseudonymous Nakamoto's P2P Foundation account posted its first message in five years, stating: "I am not Dorian Nakamoto."
Hal Finney (May 4, 1956 August 28, 2014) was a pre-bitcoin cryptographic pioneer and the first person (other than Satoshi himself) to use the software, file bug reports, and make improvements. He also lived a few blocks from Dorian Nakamoto's family home, according to Forbes journalist Andy Greenberg. Greenberg asked the writing analysis consultancy Juola & Associates to compare a sample of Finney's writing to Satoshi Nakamoto's, and they found that it was the closest resemblance they had yet come across (including the candidates suggested by Newsweek, Fast Company, The New Yorker, Ted Nelson and Skye Grey). Greenberg theorized that Finney may have been a ghostwriter on behalf of Nakamoto, or that he simply used his neighbor Dorian's identity as a "drop" or "patsy whose personal information is used to hide online exploits". However, after meeting Finney, seeing the emails between him and Satoshi, his bitcoin wallet's history including the very first bitcoin transaction (from Satoshi to him, which he forgot to pay back) and hearing his denial, Greenberg concluded Finney was telling the truth. Juola & Associates also found that Satoshi's emails to Finney more closely resemble Satoshi's other writings than Finney's do. Finney's fellow extropian and sometimes co-blogger Robin Hanson assigned a subjective probability of "at least" 15% that "Hal was more involved than hes said", before further evidence suggested that was not the case.
On 8 December 2015, Wired wrote that Craig Steven Wright, an Australian former academic, "either invented bitcoin or is a brilliant hoaxer who very badly wants us to believe he did". Craig Wright took down his Twitter account and neither he nor his ex-wife responded to press inquiries. The same day, Gizmodo published a story with evidence obtained by a hacker who supposedly broke into Wright's email accounts, claiming that Satoshi Nakamoto was a joint pseudonym for Craig Steven Wright and computer forensics analyst David Kleiman, who died in 2013. A number of prominent bitcoin promoters remained unconvinced by the reports. Subsequent reports also raised the possibility that the evidence provided was an elaborate hoax, which Wired acknowledged "cast doubt" on their suggestion that Wright was Nakamoto.
On 9 December, only hours after Wired claimed Wright was Nakamoto, Wright's home in Gordon, New South Wales was raided by at least ten police officers. His business premises in Ryde, New South Wales were also searched by police. The Australian Federal Police stated they conducted searches to assist the Australian Taxation Office and that "This matter is unrelated to recent media reporting regarding the digital currency bitcoin." According to a document released by Gizmodo alleged to be a transcript of a meeting between Wright and the ATO, he had been involved in a taxation dispute with them for several years.
On 2 May 2016, Craig Wright posted on his blog publicly claiming to be Satoshi Nakamoto. In articles released on the same day, journalists from the BBC and The Economist stated that they saw Wright signing a message using the private key associated with the first bitcoin transaction. Wright's claim was supported by Jon Matonis (former director of the Bitcoin Foundation) and bitcoin developer Gavin Andresen, both of whom met Wright and witnessed a similar signing demonstration.
However, bitcoin developer Peter Todd said that Wright's blog post, which appeared to contain cryptographic proof, actually contained nothing of the sort. The Bitcoin Core project released a statement on Twitter saying "There is currently no publicly available cryptographic proof that anyone in particular is Bitcoin's creator." Bitcoin developer Jeff Garzik agreed that evidence publicly provided by Wright does not prove anything, and security researcher Dan Kaminsky concluded Wright's claim was "intentional scammery".
On May 4, Wright made another post on his blog promising to publish "a series of pieces that will lay the foundations for this extraordinary claim". But the following day, he deleted all his blog posts and replaced them with a notice entitled "I'm Sorry", which read in part:
I believed that I could put the years of anonymity and hiding behind me. But, as the events of this week unfolded and I prepared to publish the proof of access to the earliest keys, I broke. I do not have the courage. I cannot.
In June 2016, the London Review of Books published a 35,000 word article by Andrew O'Hagan about the events, based on discussions with Wright and many of the other people involved. It also reveals that the Canadian company nTrust was behind Wright's claim made in May 2016.
In a 2011 article in The New Yorker, Joshua Davis claimed to have narrowed down the identity of Nakamoto to a number of possible individuals, including the Finnish economic sociologist Dr. Vili Lehdonvirta and Irish student Michael Clear, then a graduate student in cryptography at Trinity College Dublin. Clear strongly denied he was Nakamoto, as did Lehdonvirta. In October 2011, writing for Fast Company, investigative journalist Adam Penenberg cited circumstantial evidence suggesting Neal King, Vladimir Oksman and Charles Bry could be Nakamoto. They jointly filed a patent application that contained the phrase "computationally impractical to reverse" in 2008, which was also used in the bitcoin white paper by Nakamoto. The domain name bitcoin.org was registered three days after the patent was filed. All three men denied being Nakamoto when contacted by Penenberg.
In May 2013, Ted Nelson speculated that Nakamoto is really Japanese mathematician Shinichi Mochizuki. Later, an article was published in The Age newspaper that claimed that Mochizuki denied these speculations, but without attributing a source for the denial. A 2013 article, in Vice listed Gavin Andresen, Jed McCaleb, or a government agency as possible candidates to be Nakamoto. Dustin D. Trammell, a Texas-based security researcher, was suggested as Nakamoto, but he publicly denied it. In 2013, two Israeli mathematicians, Dorit Ron and Adi Shamir, published a paper claiming a link between Nakamoto and Ross William Ulbricht. The two based their suspicion on an analysis of the network of bitcoin transactions, but later retracted their claim.
Some considered Nakamoto might be a team of people; Dan Kaminsky, a security researcher who read the bitcoin code, said that Nakamoto could either be a "team of people" or a "genius"; Laszlo Hanyecz, a former bitcoin core developer who had emailed Nakamoto, had the feeling the code was too well designed for one person.
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