No need to summarize the paper. 1) Bitcoin is designed to try to ensure consensus: that everyone has the same view of what blocks are in the blockchain. What could go wrong if it didn't provide consensus? 2) When a miner successfully mines a block (is the first to extend the existing chain by one block), they receive Bitcoins as a reward. If we eliminated this (eliminated both the coinbase reward and the transaction fees), what would go wrong? 3) Was there anything about the paper that you'd like to discuss in class? Or, what's the one thing you'd most like us to discuss in class today?