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  A   cryptocurrency ,   crypto currency   or   crypto   is a   digital asset   designed to work as a   medium of exchange   wherein individual coin ownership records are stored in a   ledger   existing in a form of computerized   database   using   strong cryptography   to secure transaction records, to control the creation of additional coins, and to verify the transfer of coin ownership. [1] [2]   It typically does not exist in physical form (like paper money) and is typically not issued by a central authority. Cryptocurrencies typically use   decentralized control   as opposed to centralized   digital currency   and   central banking   systems. [3]   When a cryptocurrency is minted or created prior to issuance or issued by a single issuer, it is generally considered centralized. When implemented with decentralized control, each cryptocurrency works through   d...