Scaling DeFi with ZK Rollups: Design, Deployment, and Evaluation of a Real-Time Proof-of-Concept

2025-05-31

AI Summary

Ethereum’s scalability bottleneck severely hinders the practical deployment of decentralized applications (dApps). To address this, we design and implement the first ZK Rollup-based decentralized exchange (DEX) prototype tailored to real-world DeFi use cases. Our approach leverages zk-SNARKs to enable off-chain batch transaction execution and on-chain cryptographic validity verification. We deliver a fully functional end-to-end proof-of-concept deployment and propose a scalable architecture co-designed for Ethereum Layer 1 and Layer 2 interoperability. Furthermore, we quantitatively analyze the trade-off between finality latency (sub-minute) and cryptographic security guarantees. Experimental evaluation demonstrates a token-swap throughput of 71 transactions per second (TPS), representing a 4.9× improvement over Ethereum’s base-layer capacity (12 TPS). This work validates ZK Rollup’s potential to simultaneously achieve high performance, strong security, and engineering feasibility in DeFi systems.

Technology Category

• Data Mining & Knowledge Management: Scalability, Parallel & Distributed Systems
• Search and Optimization: Distributed Search
• Machine Learning: Scalability of ML Systems

Application Category

• Security and Privacy: Cryptocurrency and smart contracts
• Economics, Online Markets and Human Computation: Economic aspects of blockchain and cryptocurrencies
• Search and Retrieval-Augmented AI: Efficiency and scalability of Web search engines

Abstract

Ethereum's scalability limitations pose significant challenges for the adoption of decentralized applications (dApps). Zero-Knowledge Rollups (ZK Rollups) present a promising solution, bundling transactions off-chain and submitting validity proofs on-chain to enhance throughput and efficiency. In this work, we examine the technical underpinnings of ZK Rollups and stress test their performance in real-world applications in decentralized finance (DeFi). We set up a proof-of-concept (PoC) consisting of ZK rollup and decentralized exchange, and implement load balancer generating token swaps. Our results show that the rollup can process up to 71 swap transactions per second, compared to 12 general transaction by Ethereum. We further analyze transaction finality trade-offs with related security concerns, and discuss the future directions for integrating ZK Rollups into Ethereum's broader ecosystem.

Problem

• Addressing Ethereum's scalability issues for dApps adoption
• Evaluating ZK Rollups' performance in real-world DeFi applications
• Exploring transaction finality trade-offs and security in ZK Rollups

Innovation

• ZK Rollups bundle off-chain transactions efficiently
• Proof-of-Concept achieves 71 swaps per second
• Load balancer optimizes decentralized exchange performance