Abstract
Blockchain is a cutting-edge technology that has changed the way people communicate and trade. It's a chain of blocks in a distributed and decentralized peer-to-peer (P2P) network that stores information with digital signatures. This method was first used to develop digital currencies such as bitcoin and Ethereum. However, some recent research and industrial studies have focused on the prospects that blockchain presents in a variety of other application fields in order to take advantage of the technology's fundamental qualities, such as decentralization, persistency, anonymity, and audibility. In this study, We give a thorough evaluation of blockchain's use in Wireless Networks, the Internet of Things (IoT), and Smart Grids (SGs). We also present the main obstacles of Blockchain in order to allow researchers to solve them and improve the technology's use.