programming

HOW DO VALIDIUMS INTERACT WITH ETHEREUM?
Validiums are scaling protocols built on top of the existing Ethereum chain. Although it executes transactions off-chain, a validium chain is administered by a collection of smart contracts deployed on Mainnet including:

Verifier contract: The verifier contract verifies the validity of proofs submitted by the validium operator when making state updates. This includes validity proofs attesting to the correctness of off-chain transactions and data availability proofs verifying the existence of off-chain transaction data.

Main contract: The main contract stores state commitments (Merkle roots) submitted by block producers and updates the validium's state once a validity proof is verified on-chain. This contract also processes deposits to and withdrawals from the validium chain.