Abstract
A blockchain is a sort of database. A blockchain is essentially a network of computer systems that have duplicated and disseminated a digital record of transactions, with each block in the chain containing different transactions. Digital or virtual currency in the form of cryptocurrencies, the majority of which are decentralized networks based on blockchain technology. The chapter gives a framework for understanding the origins and purposes of blockchain and cryptocurrency, as well as the advantages and disadvantages of blockchain. In this study, we also covered the blockchain and distributed ledger systems, which use a mentoring consensus technique to record and verify transactions. The global cryptocurrency regulation, as well as the legal challenges linked with blockchain, have been thoroughly examined. In addition, the present study discusses the current state of cryptocurrencies in India. As a result, cryptocurrency and the blockchain technology that powers it are frequently regarded as new and advanced.