The Walrus protocol brings new ideas to the field of key management. Its core is to realize a "Key as a Service" architecture by introducing programmable data access control mechanisms to address the pain points of traditional key management. Unlike traditional solutions, this system enforces access policies on-chain while providing cryptographic-level security guarantees. Combined with the application of Seal technology, autonomous AI systems can achieve more granular permission management and stronger controllability during cross-chain collaboration. This innovation is particularly helpful for blockchain infrastructure and AI application scenarios, especially for professional teams that need to build high-security data access architectures. The WAL ecosystem's exploration in this area offers a reference technological paradigm for the industry.