Codatta is an open, decentralized, multi-chain protocol that combines blockchain-based data infrastructure with a network of human contributors and AI agents to address issues like data silos and lack of data integrity. It functions as a knowledge layer for AI, transforming human expertise into tradable, on-chain assets. The platform enables domain experts to contribute structured knowledge to specialize AI models, with quality maintained through expert verification, staking, and voting. Contributions are recorded on-chain for transparency, while the data remains private and encrypted off-chain. This system allows contributors to earn ongoing royalties based on their data's impact in applications like AML software, on-chain risk management, and personalized dApp experiences, while ensuring user privacy and data ownership.