In order to have a decentralised database, you need to have security. In order to have security, you need to - you need to have incentives.

Blockchains will drop search costs, causing a kind of decomposition that allows you to have markets of entities that are horizontally segregated and vertically segregated.

You can write anything that you would be able to write on a server and put it onto the blockchain. Instead of Javascript making calls to the server, you would be making calls to the blockchain.

You could imagine something like a completely automated system for renting bikes that's just done completely over blockchain crypto-payments. And theoretically just sort of start it up, and it works completely autonomously.

In general, signalling theory says that if you have a good way of proving something and a noisy way of proving something, and you choose the noisy way, that means chances are it's because you couldn't do the good way in the first place.

The thing that I often ask startups on top of Ethereum is, 'Can you please tell me why using the Ethereum blockchain is better than using Excel?' And if they can come up with a good answer, that's when you know you've got something really interesting.