Recently, I revisited Miden's architecture design and found something quite interesting—they've really clarified the roles of Layer2 and Ethereum.

Right now, most Rollups are still relying on Ethereum to do some of the work (via Calldata and such), but Miden takes a different approach: it uses client-side proofs and completely separates execution from global consensus. This way, Ethereum can focus on what it does best—providing robust security and finality.

In simple terms, it's about letting the experts do what they're best at, with each party handling its own responsibilities.