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A cryptocurrency is a medium of exchange created and stored electronically as a digital asset. It uses strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets. Cryptocurrencies use decentralized consensus-databases known as Blockchain–built on public supply and demand as opposed to centralized digital currency and central banking systems.
Bitcoin, first released as open-source software in 2009, is generally considered the first decentralized cryptocurrency. Since the release of bitcoin, over 4,000 altcoins including the soon to be released Libra coin (alternative variants of bitcoin, or other cryptocurrencies) have been created.