关键词: 智能合约, 区块链, 众筹, 众筹区块链, 私有区块链

Abstract: P2P Crowdfunding is a hotspot model based on Internet financial technology. Currently, there are problems such as the lack of trust and supervision, and blockchain and smart contract provide a new way to solve these problems. As a distributed ledger database, the blockchain records the immutable asset data. The smart contract stored in the blockchain can directly control the digital asset, and constructs the trusted computing environment for crowd funding. Crowdfunding Private Blockchain (CPBC) stores and executes the code and data on the blockchain, not only makes that all the projects on the chain true and reliable, but also makes the execution of the project credible, greatly enhance the trusty of the platform, and reduce the broker fee. The design of smart contract for the crowdfunding blockchain is given, which includes the execution model and state storage model, and gives the concrete examples in Java. The research results show that smart contract design on the CPBC could meet the 80% demand for business, and obtain the preliminary application and achieve good results.

Key words: smart contract, blockchain, crowdfunding, crowdfunding private blockchain (CPBC), private blockchain