This book constitutes the refereed proceedings of the Third Conference on 2026 International Conference on Blockchain and Web3.0 Technology Innovation and Application Exchange, BWTAC 2026, held in Hangzhou, China, during November 6–8, 2026.

The 44 full papers included in this book were carefully reviewed and selected from 85 submissions. They were organized into the following topical sections: Protocols, Scalability, and Cross-Chain Interoperability; Security, Privacy, and Confidentiality; AI, Data Intelligence, and Web3 Applications.