Satoshi Nakamoto(中本哲史,Nakamoto Satoshi?) is the pseudonymous person or group that designed and created the Bitcoin protocol and reference software, Bitcoin-Qt. In 2008, Nakamoto published a paper on The Cryptography Mailing list at metzdowd.com describing the Bitcoin digital currency. In 2009, he released the first Bitcoin software that launched the network and the first units of the Bitcoin currency.
Nakamoto continued to contribute to his Bitcoin software release with other developers until contact with his team and the community gradually began to fade in mid-2010. Near this time, he handed over control of the source code repository and alert key functions of the software to Gavin Andresen. Also around this same time, he handed over control of the Bitcoin.org domain and several other domains to various prominent members of the Bitcoin community.
Nakamoto is believed to be in possession of roughly one million Bitcoin. At one point in December 2013, this was the equivalent of 1.1 billion US dollars. 
There are no records of Nakamoto's identity or identities prior to the creation of Bitcoin. Satoshi is a male, Japanese name, whose meaning is variously given as "wise", "clear-thinking", "quick-witted" or "intelligent history", i.e. a person with intelligent ancestors. "Nakamoto"(中本) is a Japanese family name.
On his P2P Foundation profile, Nakamoto claimed to be an individual male at the age of 37 and of Japanese origin, which was met with great skepticism due to his use of English and his Bitcoin software not being documented nor labelled in Japanese.
The first release of his original Bitcoin software is speculated to be of a collaborative effort, leading some to claim that Satoshi Nakamoto was a collective pseudonym for a group of people.
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 am and 11 am 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 UTC−05:00 or UTC−06:00 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.
Many articles have been written about possible identities of Nakamoto. Here is a list of the notable possibilities
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 denies he is Nakamoto, as does Lehdonvirta.
In October 2011, investigative journalist Adam Penenberg cited circumstantial evidence that identified Neal King, Vladimir Oksman and Charles Bry. This included a patent application they filed in 2008. 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, in which it was claimed that Mochizuki has denied these speculations.
Jed McCaleb is claimed by some to be Nakamoto. McCaleb is the creator of Overnet, the eDonkey2000 file-sharing application and the founder of Mt.Gox Bitcoin exchange. Once a strong supporter of Bitcoin, McCaleb later co-founded the company Ripple Labs, to develop another digital currency, Ripple.
Dustin D. Trammell, a Texan security researcher, was suggested as Nakamoto, but he publicly denied it. 
In December 2013, Nick Szabo was implicated using reverse textual analysis. Nick Szabo is a decentralized currency enthusiast and published a paper on "bit gold" that is considered a precursor to bitcoin.
^Penenberg, Adam. "The Bitcoin Crypto-Currency Mystery Reopened". Fast Company. "A New Yorker writer implies he found Bitcoin's mysterious creator. We think he got the wrong man, and offer far more compelling evidence that points to someone else entirely."