Kaleido can build more complex decentralized applications by combining trusted P2P networks with on-line contracts. Chain book is the data and status switching mechanism of each application, while the interaction of P2P network is the extension under the chain, responsible for completing the game logic and reaching the consensus under the chain. In a trusted P2P network, 42 / 53 through zero-knowledge proof of cryptography and signature of trusted data, it can be extended to more trusted data interactions completed through centralized servers.