A Review on Blockchain Security Issues and Challenges

Blockchain is one of the emerging technology in recent years in the field of information technology. Blockchain is a decentralized, traceable, temper proof, and trustworthy distributed database system operated by multiple nodes. Blockchain is used not only in cryptocurrency or electronic cash, but also in other applications such as financial transactions, healthcare, insurance, IoT, manufacturing, education, etc., with the promise of more skills and higher resilience. Over the past few years, a significant number of public announcements and news have been made about its goals, partnerships, development, and implementation. However, the most important aspects and discussions on issues related to blockchain security, challenges and policies have been raised around the world. Focus on blockchain security issues and this review paper reviewed 80 research papers. Notable works in this review article are on the concept of blockchain ecosystems, the division of blockchains, the implementation of blockchains and finally security issues and blockchain challenges. This review paper will be helpful for the new research work and safety related issues for blockchain.