Blockchain Technologies and Issues
Keywords:Blockchain, Smart Contract, Security.
Blockchain technologies are promising area of research on securing data since last few years. Blockchains are distributed ledgers that removing the need for a centralized authority to host data. In this paper, we review four basic elements in blockchain architecture namely distributed ledger, hashing, consen- sus algorithm and smart contract. We then highlight the issues in blockchain related to scalability, performance and security. Finally, we discuss several re- search possibilities drawn from these issues.