What should I ask Brian Armstrong?

I will be doing a Conversation with him, in case you do not know Brian is co-founder and CEO at Coinbase.

So what should I ask him?  And to be clear, this is the conversation I want to have with him, namely one that maximizes my selfish learning, not your mood affiliation.  Here is the Wikipedia page for Coinbase, here is Brian on Twitter, why does a major CEO and person with 410k Twitter followers have no Wikipedia page of his own?