🏁Introduction

The ability of any blockchain to exchange data with other blockchains is crucial because it allows blockchains to participate in the ecosystem of other blockchains; this is called interoperability. Many solutions have been developed to support interoperability, each with its own advantages and disadvantages.

The zkEVM bridge is a component that enables communication and asset migration between the zkEVM network and other networks such as L1 (Ethereum mainnet) or any L2 built on top of Ethereum.

From a user perspective, the ability to move assets from one network to another without changing the original asset's value or functionality is critical. Additionally, cross-chain messaging is supported, allowing payloads to be sent between networks.

In L2 rollups like zkEVM, L1 smart contracts ensure that L2 state transitions and data availability are properly managed. Therefore, with appropriate L2 architecture design, both ends of the bridge smart contract (SC) can be fully synchronized through the logic of the smart contract.