The first decentralized cryptocurrency is Bitcoin, which was created in 2009 by a person with the pseudonym Satoshi Nakamoto. This cryptocurrency uses SHA-2 algorithm to prove its work.

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The true identity of Satoshi Nakamoto, the creator of Bitcoin, has not yet been definitively established.  Satoshi Nakamoto is a pseudonym and the person or group behind the name remains anonymous.

 Various people have been suggested as possible Satoshis, including Nick Sabo, Hal Finney, Craig Wright, and Doreen Nakamoto, but there is no conclusive evidence to prove his true identity.
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Actually, Bitcoin uses the SHA-256 hashing algorithm, which is part of the SHA-2 family, to secure its network and validate transactions through a process called proof of work.
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