Chapter 1. How would Blockchain and Smart Contract Drive Metaverse?.-Chapter 2. How does Value Circulate in the Metaverse？Cryptocurrencies, Token Systems, and Web3 -- Chapter 3. How to Enrich Metaverse? Blockchains, Digital Twin and AI for Metaverse -- Chapter 4.How to Address Storage Issues for Metaverse? Blockchains and Distributed File Systems -- Chapter 5. How to Organize Web3 Users? Decentralized Autonomous Organizations:From Technology to Society -- Chapter 6. What Do Non-Fungible Tokens Mean for Metaverse? Measurements, Analyses, and Crimes -- Chapter 7. What could Digital Economy Do for Web3? Applications and Challenges -- Chapter 8. How does Economy System Work for Metaverse? Web3-Empowered Economy -- Chapter 9. What would Web3 & Metaverse still Face? Open Research Problems.