Smart contracts excel at executing rules but have limited ability to understand the real world. They require external data support—off-chain price information, event triggers, audit results—to make informed decisions. This is the purpose of APRO. As a cross-chain data network, APRO focuses on transforming messy off-chain signals into reliable on-chain facts. Unlike schemes that directly feed raw data into the blockchain, APRO's approach is more practical: collect first, verify second, prove last. This architectural design reflects a core philosophy—treat data as infrastructure rather than optional add-ons. In today's increasingly complex multi-chain ecosystem, this systematic data governance approach indeed opens new horizons for the reliability of smart contracts.