Expand #Bitcoin's 4 technical directions. For 10 years, we've been thinking about how to expand the #Bitcoin network. As the knowledge becomes more and more profound, we know the technical direction of the expansion #Bitcoin more comprehensively. If you want to extend #Bitcoin, you must first understand what #Bitcoin is. #Bitcoin is a CAS (Complex Adaptive System) consisting of three types of formal subsystems. The three types of sub-formal systems are: - 1,Individual sovereignty, 1:1 digital state and individual self-mapping. (i.e. UTXO in Bitcoin) - 2, P/NP Perceptual Reality, Asymmetric Solving and Verification of Machine Understanding Perceiving Natural Reality. (i.e. POW in Bitcoin) - 3, Trust code consensus intermediary, notarization and execution environment based on code consensus. (i.e. Blockchain in Bitcoin) Based on the above understanding of #Bitcoin, we can have 4 major directions to expand #Bitcoin technology. The first block: UTXO-like individual sovereignty to extend applications, typical of the BRC20 or OmniLayer protocols that have been done, but limited to assets, we can try to extend to various new applications such as DID The second block: the expansion of the P/NP perceptual reality subsystem, such as BTC's POW mining pool protocol is such a scaling technology, but this is only a vertical expansion based on BTC POW, we can explore the horizontal expansion based on P/NP, so as to promote the reality of cryptocurrency technology to serve the real economy. The third block: Blockchain technology, which is the most resource-rich exploration direction for the entire cryptocurrency, and it is also the most fully explored technology. Technically, it's basically transparent. Blockchain solves the problem of trusting code rules for transparency. So in doing Defi related fields, compared to traditional finance, there is an increase in transparency. The fourth block: is also the largest one, that is, referring to Bitcoin's CAS technology solution, that is, the direction of the above 3 blocks, learning Bitcoin's CAS technology, and integrating into new CAS products similar to Bitcoin. This is the biggest track with the most potential. It's also the track we've always neglected the most, because we've always been stuck in a local thinking glitch.