As an important technology to ensure data security, consistency, traceability, etc., blockchain has been increasingly used in Internet of Things (IoT) applications. The integration of blockchain and edge computing (IBEC) can further improve the resource utilization in terms of network, computing, storage, and security. This paper aims to present a survey on the IBEC. In particular, we first give an overview of blockchain and edge computing respectively. We then present a general architecture of an IBEC system. We next study the various applications of the IBEC in IoT. We also discuss the optimizations of the IBEC system and solutions from perspectives of resource management and performance improvement. Finally, we analyze and summarize the existing challenges posed by the IBEC system and the potential solutions in the future.

作为保证数据安全性、一致性、可追溯性等的重要技术。, 区块链已越来越多地用于物联网 (IoT) 应用。区块链与边缘计算（IBEC）的融合可以进一步提高网络、计算、存储、安全等方面的资源利用率。本文旨在介绍对 IBEC 的调查。特别是，我们首先分别概述区块链和边缘计算。然后，我们介绍了 IBEC 系统的一般架构。我们接下来研究 IBEC 在物联网中的各种应用。我们还从资源管理和性能改进的角度讨论了 IBEC 系统的优化和解决方案。最后，我们分析总结了 IBEC 系统带来的现有挑战以及未来可能的解决方案。