Bitcoin (BTC) is the most widely used digital currency at present. It was born on January 3, 2009. It is a kind of peer-to-peer (P2P) transmission digital encryption currency, with a total of 21 million. Bitcoin network releases a certain amount of money every 10 minutes, which is expected to reach the limit in 2140. Bitcoin is called "digital gold" by investors

The concept of bitcoin was first proposed by Nakamoto in 2008. It is an open source digital currency system designed and released according to Nakamoto's ideas. It uses peer-to-peer technology to operate without a central agency or bank, and its design is public, no one owns or controls bitcoin, and everyone can participate.

Unlike most currencies, bitcoin does not rely on specific currency institutions to issue, it is generated through a large number of calculations based on specific algorithms. Bitcoin economy uses the distributed database composed of many nodes in the whole P2P network to confirm and record all transaction behaviors, and uses the design of cryptography to ensure the security of all aspects of currency circulation.

The biggest characteristic of bitcoin is that its total quantity is very limited and it is extremely scarce. At present, this brand-new virtual currency is not controlled by any government or bank, so it has not been legalized.

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