Bitcoin is a digital currency created in 2009 by Satoshi Nakamoto. Public keys are where you receive your bitcoins and you can share with anyone for a payment. In exchange private keys are not made to be shared, they just are used to sign your transacctions when send bitcoins to somebody. Losing or sharing private keys, may lead to lose your bitcoins. The name also refers to the open-source program that he designed for the use of currency and its peer-to-peer network that is formed. Unlike most of the coins, the bitcoin does not depend on the confidence in any centralized emitter, as a server of a major bank for example. Bitcoin uses a distributed database spread across nodes in the peer-to-peer network to register transactions, and uses encryption to provide basic security functions, certifying that bitcoins can only be worn by the owner, and avoid double expenses. 

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