Block chain technology can be considered as the digital record of the transactions that came into application during the invention of bit coins, which is also termed as the crypto currencies. The block chain technology decentralize and digitize the transaction through multiple computers connected in peer-to-peer network. The block chain mainly have the structure of the blocks of the individuals ‘records as blocks. These blocks are connected together as single list called chain. The block chain is mainly concerned with the digital ledger technology that is used to create the back end of this crypto currency.