The source code of Retrospect Chain is based on Ethereum. In order to facilitate commercial applications, significant improvements have been made in dynamic protocols, smart contracts, and other areas, aiming to construct a trusted and distributed business ecosystem that is both self-recurring and expandable. This ecosystem promotes relatively transparent and symmetrical information, minimizes trust friction among different participants, allows each participant to contribute their value to the business ecosystem and receive fair compensation, and facilitates the rapid circulation of value, thereby continuously expanding the closed-loop business environment of the Retrospect Chain.