A digital currency in which encryption techniques are used to regulate the generation of units of currency and verify the transfer of funds, operating independently of a central bank. The decentralized control of each cryptocurrency works through a blockchain, which is a public transaction database, functioning as a distributed ledger. Currencies are easily used to transfer the balance between the parties in transactions. These transfers go around the use of public and private encryption keys for security purposes. The transfer of balances ends with lower processing fees, allowing users to avoid sharp shipping fees from most banks and financial institutions. The first Cryptocurrency is Bitcoin which is created by a guy or an organization called Satoshi Nakamoto (Identity is still unknown). Bitcoin is legal in Japan. Other countries are still studying about its potential and threats to the economy.