Hold up, let me break this down properly.

Miden is a Layer 2 blockchain built on Ethereum. Here's how it works: transaction proofs get posted to Ethereum, creating an on-chain record that everything actually happened. But here's the thing—the heavy lifting? That all goes down off-chain.

So you get the security guarantees of Ethereum without clogging up the main chain. It's the whole point of L2s, really.