This book constitutes the refereed proceedings of the Third International Conference on Blockchain Technology and Emerging Applications, BlockTEA 2023, held in December 2-3, 2023 in Wuhan, China.The 10 regular papers presented were carefully reviewed and selected from 41 submissions.

.- Applied Cryptography and system security. .- Identity-Based Key Verifiable Inner Product Functional Encryption Scheme. .- DRSA: Debug Register-based Self-relocating Attack against software-based remote authentication. .- Fuzz Testing of UAV Configurations Based on Evolutionary Algorithm. .- A suvey of algorithms for addressing the Shortest Vector Problem (SVP). .- Blockchain and applications. .- PSWS: Private Support-Weighted Sum Protocol for Privacy-Preserving Blockchain-Based Voting With Ballot Secrecy. .- Cross-chain trusted information match scheme with privacy-perserving and auditability. .- Verifiable Attribute-Based Proxy Re-Encryption with Non-repudiation based on Block-Chain. .- Blockchain-based Hierarchical Access Control with Efficient Revocation in mHealth System.