Bitcoin is a cryptocurrency and a digital payment system. It was invented by an unknown programmer, under the name Satoshi Nakamoto in 2009. You can purchase bitcoins from the market, receive them as a payment for goods and services or create them yourself through a process called mining. Mining is done by solving the mathematical problems. The miner is entitled to bitcoins as rewards. The value of bitcoins is highly volatile. The total number of bitcoins will not exceed 21 million.
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