The Guess Chain is a fully open-source, distributed public blockchain for competition prediction and the card game market. Its architectural model consists of efficient smart contracts, DPOS consensus mechanism, Guess Chain applications, full node wallets, DApp mobile ends, and block explorers. Developed on the foundation of inheriting the characteristics and advantages of Bitcoin and Ethereum, it is an industrial alliance-level underlying blockchain system. The Guess Chain utilizes blockchain technology combined with its characteristics to build a decentralized, fair, transparent, and impartial ecosystem that disrupts the traditional competition prediction industry and the chess and card games industry, revolutionizing the dual role of "manager" and "arbitrator" in previous traditional models. The Guess Chain aims to provide enterprise-level blockchain infrastructure and industry solutions to help traditional competition industries and chess and card game industries address numerous pain points such as fraud, lack of transparency in game rules, insecure information privacy, and hacker attacks. It establishes a competition ecosystem characterized by a fair and just environment, secure and credible data, protection of personal privacy, communication compatibility, performance optimization, and decentralization control. The token GUS can be used for event prediction and trading.