A BSTRACT  
1 Introduction  
2 Preliminaries of Economic System in Metaverse  
3 Artificial Intelligence in Metaverse  
3.1 Representative AI Algorithms  
3.2 Establishment of Metaverse Environment  
3.3 Object Creation in Metaverse  
4 Blockchain in Metaverse  
4.1 Crypto Currency for Metaverse  
4.2 Transaction Characteristics in Metaverse  
4.3 Blockchain-empowered Market in Metaverse  
4.4 Blockchain-empowered Authentication in Metaverse  
5 Integration of Blockchain and AI on Metaverse  
5.1 Blockchain for AI  
6 Challenges and Open Issues  
6.1 Open Issues on Digital Economy in Metaverse  
6.2 Artificial Intelligence Issues  
6.3 Blockchain-related Issues  
6.4 Governance in Metaverse  
6.5 Blockchain-empowered Applications for Metaverse  
6.6 Security and Privacy for Metaverse  
7 Conclusion