Nostr integrates with your Bitcoin wallet (technically your “lightning” wallet, which is a fast and cheap way of sending Bitcoin) so that users can send and receive Bitcoin with each other. The author breaks down internet networks into three categories: protocol networks, corporate networks, and blockchain networks. The author spends most of the book arguing that blockchain networks provide the great features of corporate networks with the openness of protocol networks, so blockchains give us the best of both worlds.