Currently, developers encounter significant obstacles when trying to obtain real-time and dependable data across various blockchains. They often depend on disconnected, centralized data sources and inadequate infrastructure, which hinders both development and broader adoption. Synternet presents a revolutionary solution by offering permissionless, real-time data infrastructure that allows developers to create the next wave of cross-chain decentralized applications (DApps) through the use of composable data streams. This innovative data layer supports a variety of projects in fields such as AI, DeFi, decentralized physical infrastructure networks (DePIN), trading, IoT, gaming, governance, and beyond. By leveraging this technology, developers can access real-time data to enhance complex models on-chain. Furthermore, they can construct decentralized machine learning models that utilize data and events from multiple chains, enabling them to verify ownership through cross-referencing on-chain data. This capability allows for the validation of provenance across diverse sources of truth, independent of the blockchain in use. Additionally, Synternet facilitates the integration of real-world sensor data into blockchain applications, enhancing their functionality and reliability. In this way, developers can create more robust solutions that take full advantage of the vast potential of blockchain technology.