She's saying some subtle things about what a "system" is. BitCoin and BitTorrent have almost nothing in common as protocols go. At a high level, BitTorrent's D

She's saying some subtle things about what a "system" is. BitCoin and BitTorrent have almost nothing in common as protocols go. At a high level, BitTorrent's DHT uses some notion of consensus to communicate between peers about who is on the network and where they and their files are. There is never system-wide coherence of the DHT, but the algorithm (Kademlia) doesn't require anything like that. BitCoin's notion of consensus requires that coherence in all but the last ~10 minutes worth of the blockchain. Zooming out even farther, BitCoin requires the entire network for anything to happen at all. BitTorrent leverages the entire network to speed up interactions between two individual nodes. If you're still not convinced, consider what happens if 40% of the network is cut off from the rest for a large period of time. After the extended network partition ends, and the two big swarms rejoin, what do users find is different?