Bitcoin was introduced in 2009 and SATOSHI NAKAMOTO is the inventor behind the invention but there are assumptions only that he is the inventor as there is no assurity that he is the inventor as no one has met him yet and he used to talk to his investors only on the social networking sites but in my point of view of he exists or ever existed, then he would be very happy with the growth of bitcoin and if I got chance once in my life then I would like to meet him.