[News Flash] The results of Ethereum's modular experiments have triggered a surge in blockchains, but also brought a series of problems, such as user fragmentation, reduced economic efficiency, and lack of cross-platform interoperability for developers. In contrast, Bitcoin is adopting a different architecture, using Lightning as the interoperability backbone, which is closer to the technology stack of Bitcoin's peer-to-peer model. The new social network Nostr, based on similar principles to Bitcoin, aims to maximize interoperability, creating new opportunities for Bitcoin applications to interact with Nostr's growing ecosystem. However, Bitcoin's modular story is not without risks, such as regulatory issues, operator fraud, which may hinder the growth of electronic cash mints, and Nostr relays have shown a trend towards centralization.