The concept of CITY chain is to 'redefine urban life by applying block chain technology + gamification rules', as the basic public chain of future urban life. All the CITY life scenes chain can be connected to the CITY, you can use the endogenous Token consumer scenarios, different scenarios of Token can be equivalent exchange, through intelligent contracts through the Token transfer of different life scenes, a user in a scenario to earn the Token can be used in other scenarios consumption. The rules of gamification will encourage users to actively participate in urban life, contribute value to urban development, and receive corresponding CITY rewards, thus forming a virtuous cycle.