The rapid growth of blockchain technology transformed the financial landscape by bringing about decentralized finance, digital currencies, and alternative applications. Nevertheless, mass adoption of cryptocurrencies has been significantly hindered, primarily because of network congestion, extremely high transaction fees, and slow processing times on Layer 1 blockchains such as Bitcoin and Ethereum. To resolve these problems, the idea Layer 2 of cryptocurrency was a breakthrough revolution. Layer 2 solutions are developed on top of existing blockchain systems with the aim of improving scalability, efficiency, and usability without sacrificing security.