currency exchange is a digital asset designed to work as a medium of exchange that uses strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets.123 Cryptocurrencies are a kind of digital currency, virtual currency or alternative currency. Cryptocurrencies use decentralized control4 as opposed to centralized electronic money and central banking systems.5 The decentralized control of each cryptocurrency works through distributed ledger technology, typically a blockchain, that serves as a public financial transaction database.67 Bitcoin, first released as open-source software in 2009, is generally considered the first decentralized cryptocurrency.8 Since the release of Bitcoin, over 4,000 altcoins (alternative variants of Bitcoin, or other cryptocurrencies) have been created. In 1983 the American cryptographer David Chaum conceived an anonymous cryptographic electronic money called ecash.910 Later, in 1995, he implemented it through Digicash,11 an early form of cryptographic electronic payments which required user software in order to withdraw notes from a bank and designate specific encrypted keys before it can be sent to a recipient. This allowed the digital currency to be untraceable by the issuing bank, the government, or a third party. In 1996 the NSA published a paper entitled How to Make a Mint: the Cryptography of Anonymous Electronic Cash, describing a Cryptocurrency system first publishing it in a MIT mailing list12 and later in 1997, in The American Law Review (Vol. 46, Issue 4). 33379https://www.x-crypto.com
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