5. Cross-Chain Implementation

Supported Chains

Initial Launch (Phase 1):

• Ethereum

• Arbitrum

• Optimism

Expansion (Phase 2):

• Polygon

• Avalanche

• BNB Chain

Future Expansion (Phase 3):

• Base

• zkSync Era

• Scroll

• Additional EVM chains

Chain-Specific Considerations

Ethereum:

• Multiple flash loan providers (Aave, dYdX, Maker)

• Higher gas costs require optimization

• Serves as primary source chain

Arbitrum:

• Aave as primary flash loan provider

• Lower gas costs but potential sequencer risks

• Both source and destination functionality

Optimism:

• Aave as primary flash loan provider

• Both source and destination functionality

• Superchain architecture considerations

L2 Considerations:

• Sequencer failure contingencies

• Chain-specific circuit breakers

• Reorg handling procedures

Multi-Chain Coordination

flowchart TD
    subgraph Chain1[Ethereum]
        OR1[Operation Registry]
    end
    
    subgraph Chain2[Arbitrum]
        OR2[Operation Registry]
    end
    
    subgraph Chain3[Optimism]
        OR3[Operation Registry]
    end
    
    subgraph "Off-Chain Infrastructure"
        Monitor[Monitoring Service]
        Index[Indexing Service]
        Coordinator[Coordination Service]
    end
    
    OR1 <--> Monitor
    OR2 <--> Monitor
    OR3 <--> Monitor
    
    Monitor --> Index
    Index --> Coordinator
    Coordinator --> OR1 & OR2 & OR3

Cross-Chain Messaging

Message Types:

• Operation Initiation

• Status Updates

• Health Broadcasts

• Circuit Breaker Triggers

Implementation Options:

1. Native Bridge Messaging:

   • Use existing bridge message passing

   • One message per operation

   • Cost-effective but dependent on bridge

2. Dedicated Messaging Layer:

   • Custom cross-chain messaging protocol

   • Independent of token bridging

   • Higher cost but more reliable

3. Hybrid Approach (Recommended):

   • Use bridge messaging for normal operations

   • Dedicated messaging for critical functions

   • Fallback mechanisms for failure scenarios

---

Next: ⚡ Flash Loan Recycling System Back to: Table of Contents