Building EIP2771 Gasless Relayer

Building a highly scalable, fault-tolerant relayer for EIP-2771 requires a robust architecture that can efficiently handle meta-transactions at scale.

System Goals

1. High Scalability: Handle thousands of concurrent meta-transactions with low latency.
2. Fault Tolerance: No single point of failure; system should remain operational under load or partial outages.
3. Security: Protect user data, ensure valid meta-transactions, and prevent abuse.
4. Flexibility: Easy to integrate with various dApps and support future protocol upgrades.

High-Level Overview

The server will have two primary threads:

1. Relay Thread: Handles incoming meta-transaction requests, signs them, and sends them to the blockchain. Returns transaction hashes to REST API clients.
2. Monitor Thread: Monitors the blockchain for transaction confirmations, updates the database, and generates analytical insights.

Future works

1. The threading concept could be changed to a MessageQueuing process, with a little change in the code, greater scaliablity and redundancy can be achieved