The development of blockchain technology can be divided into three stages, namely blockchain 1.0, blockchain 2.0 and blockchain 3.0 .
Blockchain 1.0 era: refers to the digital currency application represented by Bitcoin, which is a point-to-point cash payment system without the support of a third party, and is mainly used for payment and circulation functions of money.
Blockchain 2.0 era refers to the development of intelligent contract design on the basis of Bitcoin represented by Ethereum, which