Satoshi Nakamoto is the name used by the unknown person or people who designed bitcoin and created its original reference implementation. As 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 claimed to be a man living in Japan, born on 5 April 1975.
There is still doubt about the real identity of Satoshi Nakamoto:
Nick Szabo
Dorian Nakamoto
Hal Finney
Craig Steven Wright