I speculate that it isn't, and/or has never been a single person. It's likely that its a group of people who use Satoshi as obfuscation and branding. People wan

I speculate that it isn't, and/or has never been a single person. It's likely that its a group of people who use Satoshi as obfuscation and branding. People want to believe that an ubermensch cryptographic Einstein is among us, single-handedly dragging us into the future. It's high drama for a fairly dry industry. It's stands to reason that the more boring answer is correct- that Satoshi is a group of people from the beginning working on the blockchain and the ideology behind it. This allows the Satoshi Group to engage in public discussion about the 'chain without the starry-eyed bullshit of celebrity appeasement.