1) So at least once and maybe twice I've called out for something he didn't do. Sorry about that!
He was gracious, and tasked me with writing an honest endorsement of what I like about the Ethereum community.
Here goes.
Conversation
2) First, Ethereum.
What ETH showed is that blockchains didn't just need to be for a single store of value -- you could in fact do basically arbitrary things with them.
With smart contracts you can write code on the blockchain.
