Satoshi is Kyle Reese.

From the wiki: "[Kyle Reese] also assisted in stealing and reverse-engineering most of the Skynet technology (Bitcoin), pulling raids on gunshops and stealing most of the laser-rifle equipment with his troops for the Resistance. His troops are also responsible for stealing the time-traveling technology that Skynet has developed. He personally volunteered for a one-way mission back to pre-apocalypse Los Angeles to save Sarah Connor, mostly because he has her picture of her given by John(, as well as posting the Bitcoin Whitepaper on the internet and starting up the first miner)."

Come on guys, this is a known fact now.