Bitcoin is a cryptocurrency designed and developed by Satoshi Nakamoto on 2009. A purely peer-to-peer electronic cash that should allow sending online payments directly between the parties. It contains a blockchain (chain of digital signatures) where when a transactions is done, the user appends his digital signature using his private key and then broadcast to the bitcoin network.
The bitcoin network works with nodes. Each node solve a proof-of-work every block and verify it. If all the transactions in the block are valid and unspent, then the block is valid. When a block is accepted, a new block is created by using the hash of the previous block.
On May of 2019 the price of Bitcoin is near to 6000 USD with 34% of active users.
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Last Update: 05-04-2019.