A cryptocurrency (or crypto currency) refers to a medium of exchange during the progressing era of contemporary times, using cryptographic mathematics to maintain its security in the event of transactions and to restrain the process of inventing new units. Cryptocurrencies are a set of which all elements of alternative currencies which are contained on another set, or precisely of digital currencies. Dating back to 2009, Bitcoin is known to have become the first decentralized cryptocurrency. After then, the awareness of digital money prompted numerous inventions of cryptocurrencies. These are referred to altcoins, as alternative cryptocurrency which blends with Bitcoin.
Cryptocurrencies are controlled under a decentralized authorization instead of centralized electronic money or centralized banking systems.Decentralized control is cooperated by the use of bitcoin's block chain undertaking database that plays the role of a distributed ledger.