Walrus is built on the Sui blockchain and that choice is very intentional. Sui is fast and designed around objects and ownership, which makes it great for managing who owns data, who can access it, and how it’s paid for. Walrus uses Sui for coordination, not for storage itself.
In simple terms:
Sui handles the rules, Walrus handles the data. Smart contracts on Sui can reference data stored on Walrus, enforce permissions, and verify availability, while Walrus takes care of storing large files efficiently. This separation keeps the system clean and scalable. Builders don’t overload the blockchain, and users get apps that actually work at real-world scale.