L2GERSync

Meet L2GERSync: The Local Librarian

L2GERSync is the component responsible for managing Global Exit Root synchronization on the L2 side. It works closely with AggOracle to maintain local GER state, providing efficient access to current and historical Global Exit Root information needed for bridge operations and claim verification.

The Information Management Challenge

Here's a scenario that illustrates why L2GERSync is crucial: Imagine your chain receives 50 global state updates per day from AggOracle. Each update contains critical information that users need to verify their cross-chain claims.

Without L2GERSync: Every time someone wants to make a claim, your chain would have to dig through contract logs, query external services, or perform expensive on-chain lookups. The user experience would be terrible – claims would take minutes instead of seconds.

With L2GERSync: The moment AggOracle updates your chain's global state, L2GERSync immediately catalogs this information in an optimized local database. When someone wants to make a claim, the response is instant – all the necessary information is perfectly organized and immediately available.

L2 chains need efficient access to GER state for several critical operations:

1. Claim Verification: Bridge claims must be verified against current Global Exit Root
2. Proof Generation: Merkle proofs require accurate GER state information
3. API Responses: Bridge Service APIs need fast GER data access
4. Historical Queries: Applications need access to historical GER transitions

L2GERSync's Solution

L2GERSync provides optimized local GER state management:

Figure 1: L2GERSync's role in L2 GER state management

How L2GERSync Works

GER Synchronization Workflow

Figure 2: GER synchronization and query workflow

The beauty: This happens automatically. You don't need to configure which mode to use – L2GERSync examines your contract when it starts up and automatically configures itself for perfect compatibility.