Matchain is an innovative decentralized AI blockchain that champions data and identity sovereignty, leveraging cutting-edge AI for comprehensive data aggregation, analytics, and user profiling to improve decentralized identity solutions and data administration. Its proprietary MatchID system delivers a secure and efficient decentralized identity solution that simplifies access across various platforms while enabling users to profit from their personal data without compromising privacy, thanks to state-of-the-art security measures. The MatchID platform is designed to be interoperable, facilitating a single sign-on experience across any decentralized application and blockchain, while also accommodating the integration of multiple multi-chain wallets alongside popular Web2 social logins like email, Twitter, Telegram, and Discord. The system indexes only public data, ensuring that non-public information remains untouched, thereby safeguarding personal data and maintaining user privacy. Additionally, MatchHub serves as a comprehensive front-end platform that employs advanced analytics to boost user engagement and create personalized experiences powered by MatchID, further enhancing the overall user experience within the ecosystem. This holistic approach not only fosters trust but also empowers users to take control of their digital identities.