Blockchain

Many applications are being built using the immutability and robustness of blockchain. Blockchain is a new class information technology that combines cryptography distributed ledger already exists. The model composed group computers collaborate towards maintaining secured database without storing data at any central unit. It behind all crypto currencies like Bitcoin, Litecoin, Ethereum, now finding its way to record everything possible. This paper focuses on basic framework blockchain model, pre-requisites, challenges Various current real-time also discussed. Finally, an application area has been proposed can be used create huge citizens country facilitate them with ease access their personal data. will open ways analysis nationwide scale.