On December 19, the "Smart +" Academy blockchain training series was held in Beijing. Zhang Kaixiang, the chief architect of Weizhong Bank's blockchain, discussed in depth how blockchain technology can be applied in the industry. Zhang Kaixiang introduced the multi-level role of blockchain, and believed that blockchain is a good solution to the pain points of multi-party collaboration. He mentioned that adversarial games and cooperative games in game theory are the essence of blockchain. The public chain more embodies adversarial games, while the alliance chain emphasizes collaboration. In his conception, the alliance chain is not simple. One chain, but multiple chains coexist and cooperate with each other. There are certain technical requirements and business capabilities need to be improved.