6G streaming advancement intensifies challenges in content security, copyright traceability, and privacy protection. This paper proposes a novel architecture integrating federated learning and blockchain. By enhancing protocol stacks and reconstructing trust mechanisms, it delivers an end-to-end solution spanning content creation, auditing, distribution, and value allocation. Federated learning metadata and blockchain interfaces are embedded within RTP/RTCP protocols, establishing a terminal-edge-cloud three-tier auditing system for hierarchical content filtering and localized privacy processing. A smart contract framework enables digital rights confirmation and value circulation through decentralized incentives and token-driven economics. Performance analysis confirms significant improvements in auditing efficiency and copyright transparency while maintaining ultra-low latency and supporting multimodal experiences, providing a systematic paradigm for secure, trustworthy streaming ecosystems.