A Systematic Review Paper on Decentralized ChatApp using Blockchain

Secure communication has become a cornerstone in the digital age, especially for instant messaging where sensitive information is frequently exchanged. But traditional centralized systems often suffer from weaknesses such as data breaches, unauthorized permissions, single points of failure, highlighting the immediate need for innovative solutions They are known to be combative against manipulation, blockchain technology provides a promising basis for enhancing message security, privacy and reliability.This paper systematically reviews the major contributions to blockchain-based secure messaging by examining eleven important studies. The research explores a variety of approaches including advanced cryptography techniques, privacy protection systems, decentralized architecture, and technologies such as smart contracts, decentralized identifiers (DIDs), interplanetary file systems (IPFS), and end-to-end integrating encryption All these technologies user authentication, data They address important issues such as authentication and privacy. Our findings provide insights into existing approaches, existing challenges, and potential opportunities for future improvement. Although blockchain-based systems exhibit strong potential to transform secure messages, issues of scalability, latency, and interoperability remain major hurdles to overcome to achieve adoption large The aim of this research is robust, efficient, scale -And future development of blockchain-enabled communication system It is to guide research efforts.