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This chapter begins with the fundamentals of blockchain and MEC. Integrating new technologies like blockchain and MEC is seen as a potential paradigm for managing the voluminous amounts of data produced by today's pervasive mobile devices and subsequently powering intelligent services. With blockchain technology, they can boost the safety of existing MEC systems by using decentralized, immutable, secure, private, and service-efficient smart contracts. These smart contracts fall into three broad categories: public blockchains, consortium blockchains, and private blockchains. Moreover, this chapter discusses the classification and current defence mechanisms of security threats. Potential solutions to MEC's main security challenges are then discussed. Following that, the authors present a classification to assist developers of various architectures in selecting an appropriate platform for specific applications, as well as insights into potential research directions. Finally, the authors present key blockchain and MEC convergence features, followed by some conclusions.

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