A few days ago, when talking about BTC and ETH, the saying 'useless is useless' was mentioned. I didn't expect this boomerang to come back to me, no objections, but it's very interesting. Let's talk about what is "useful" and "useless" below. For BTC, the true 'uselessness' is the' decentralized network based on PoW mechanism '; For ETH, the true 'uselessness' lies in the early decentralized networks based on PoW mechanism, and currently decentralized networks based on PoS mechanism. BTC is not just 'useless', its valuable storage function and cross-border transfer function are its usefulness. The 'usefulness' of Ethereum is based on its applications, providing settlement layer services for encrypted finance and security for on chain assets, which is its usefulness. The so-called 'useless generates great use' refers to the usefulness of BTC's' global value storage 'and Ethereum's' global settlement layer' based on the irreplicable decentralized network. But one of the most important issues is that if Ethereum really provides a global settlement layer service for on chain assets, ultimately, it also has the function of "value storage" in fact. In other words, Bitcoin is not unique in this aspect. Once its useful parts are invaded, it will erode its long-term value, of course, whether Ethereum has the ability to do so is another matter. The so-called 'useless generates great use' refers to the usefulness of BTC's' global value storage 'and Ethereum's' global settlement layer' based on the irreplicable decentralized network. But one of the most important issues is that if Ethereum really provides a global settlement layer service for on chain assets, ultimately, it also has the function of "value storage" in fact. In other words, Bitcoin is not unique in this aspect. Once its useful parts are invaded, it will erode its long-term value, which is why I say BTC needs its own ecology. Without ecology, it will be limited to the narrative of "digital gold".