Project Chain is a decentralized application platform for projects. It provides a suite of SDKs, APIs, and front-end programs to help users build decentralized applications based on JavaScript and sidechain technology. By offering customized sidechains, smart contracts, and app hosting services, Project Chain aims to create an easy-to-use, feature-rich, and plug-and-play system that provides an integrated project industry solution. With the Project Chain ecosystem, project companies can quickly build their own blockchains, issue tokens, select smart contract sets, and build and deploy DApps tailored to their needs. The entire process is secured by the honest and secure Project Chain main chain and sidechain consensus network. To support high-concurrency transaction environments in new domains and achieve maximum decentralization, Project Chain (PRCC) creatively proposes a main chain + sidechain, organically running blockchain solution. The Project Chain main chain uses a POS consensus mechanism with strong consensus, including a token issuance system and a complete main-sidechain communication mechanism. The sidechain utilizes an efficient DCD consensus mechanism and runs the smart contract sets for project domain business on the sidechain. Under this structure, each project company will have an independent sidechain, ensuring efficient operation of each subsystem while not affecting the performance or security of the Project Chain main chain, giving the Project Chain digital asset ecosystem high scalability that can meet the performance demands of the project domain for blockchain.