[a16z Publishes Article: Blockchain as the Key Infrastructure for Trust in the AI Era Internet] The a16z crypto team published an article stating that as AI systems scale up, the internet lacks a native way to distinguish between humans and machines, posing challenges to trust systems. Blockchain technology can provide solutions. The article summarizes the following five key roles: Increasing the cost of AI impersonation: By using decentralized human identity verification systems (such as World ID), the scale of fake identity generation can be limited, raising the cost of attacks. Decentralized identity verification: Blockchain gives users control over their own identities, avoiding single points of failure in centralized identity systems while protecting privacy and enabling censorship resistance. Creating a universal "passport": A blockchain-based identity layer allows AI agents to operate across platforms, carrying permissions and payment information, enhancing interoperability and preventing lock-in effects. Supporting machine-scale payments: Blockchain micropayments and smart contracts enable low-cost, precise payment distribution, supporting economic activities between machines. Enhancing privacy protection: Through zero-knowledge proofs, users can verify their identities without exposing specific data, preventing AI from misusing information for impersonation. a16z believes that blockchain is the necessary infrastructure for building an AI-native internet, capable of restoring trust and supporting the healthy development of AI systems.