CIChain (Cloud-insurance Chain) is the first risk insurance platform to insure the world of blockchain. It is an open-source blockchain application platform based on Ethereum’s smart contracts and features such characteristics as being decentralized, secure, credible and tamper-resistant. In CIChain, developers can customize all kinds of insurance products, including innovative, traditional insurance. By taking full advantage of the characteristics of blockchain, CIChain realizes disintermediation and guarantees automatic claims settlement by smart contracts, which greatly reduces trust cost and operating cost.