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Home > Compares >  ZK-Rollups vs Optimistic Rollups
Compares

 ZK-Rollups vs Optimistic Rollups

Molly Tallor
Last updated: 2024/04/30 at 3:19 PM
Written by Molly Tallor 10 Min Read
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As Ethereum scaling solutions continue gaining popularity, ZK-rollups vs optimistic rollups stand out as leading layer 2 options. However, for builders looking to optimize costs, performance, and security, choosing between these approaches presents a complex decision. This comprehensive guide explores the key differences between ZK-Rollups and Optimistic Rollups to help developers select the right scaling solution for their needs.

Contents
SummaryPlatform DetailsFeature Comparison: ZK-Rollups vs Optimistic RollupsFee StructureSecurity and RegulationCustomer SupportMobile ApplicationsSupported CountriesUser ExperienceCommunity and ReviewsFinal RecommendationFAQS

Summary

This article provides an in-depth feature-by-feature comparison of ZK-Rollups and Optimistic Rollups across critical aspects like security, costs, transaction finality, privacy, and developer experience. We analyze how each layer 2 approach handles fraud proofs, validity proofs, and data submission on Ethereum. The fee structure, regulatory compliance, customer support offerings, and mobile app experience for popular rollup networks like Arbitrum, Optimism, and StarkNet are also evaluated. 

By the conclusion, readers will gain a clear understanding of how ZK-Rollups and Optimistic Rollups differ and which type is generally better suited for different use cases. Interested in learning more? Check out StarkNet, a leading ZK-Rollup platform with integrations for popular wallets like MetaMask. Developers can get started building on StarkNet for free using their alpha SDKs.

Platform Details

ZK-Rollups

Our rating is 4.8/5 for networks like StarkNet and zkSync based on their security guarantees, feature scope, and developer-friendliness. ZK-Rollups bundle transactions into blocks and validate them using zero-knowledge proofs, allowing public blockchains to scale without sacrificing censorship resistance or public verifiability.

Optimistic Rollups

Optimistic rollups like Arbitrum (4.9/5) and Optimism (4.7/5) are also highly rated. They assume transactions are valid unless proven otherwise via fraud proofs. This enables rapid confirmation but relies on honest validators to dispute invalid transactions within the challenge period.

Feature Comparison: ZK-Rollups vs Optimistic Rollups

While both ZK-Rollups and Optimistic Rollups enable scaling Ethereum, they achieve this through fundamentally different technical approaches:

  • Security: ZK-Rollups rely on cryptographic validity proofs to guarantee transactions without human validators. This provides greater security than Optimistic Rollups, which assume honest participation from fraud proof validators. However, generating ZK proofs requires specialized hardware, potentially leading to centralization among key operators. Optimistic Rollups benefit from wider hardware compatibility for fraud proofs.
  • Transaction Finality: ZK-Rollups allow immediate transaction finality once validity proofs are generated. Optimistic Rollups face a delay during the challenge period to resolve disputes. On the other hand, proof generation can result in slower finality on ZK-Rollups depending on hardware speeds. Optimistic Rollups enable rapid confirmation assuming no disputes arise.
  • Data submission: ZK-Rollups submit compressed validity proof data, improving costs. But Optimistic Rollups submit raw transaction details, increasing Ethereum usage and costs over time if usage grows.
  • Privacy: ZK-Rollups conceal transaction details, preserving user privacy compared to public transaction data revealed on Optimistic Rollups.

Fee Structure

While fees depend heavily on network usage, here is a typical cost breakdown:

  • ZK-Rollups: Transaction fees include the ZK proof generation fee, varying from $0.10-1.00 currently. Deploying a basic smart contract costs $5-20 initially.
  • Optimistic Rollups: No separate ZK proof fee. Transaction fees track Ethereum gas costs, currently $0.005-0.02. Basic smart contract deployment costs $3-10.

The cost-savings from ZK data compression are outweighed by Ethereum submission fees on Optimistic Rollups today. Fees are ultimately more efficient on Optimistic Rollups for low-complexity transactions but scale poorly as usage increases long-term.

Security and Regulation

  • ZK-Rollups provide mathematically verifiable security compared to Optimistic Rollups’ reliance on rational validator behavior. Both are decentralized networks not constrained by a single jurisdiction.
  • Optimistic Rollups may receive faster regulatory clarity though, as authorities more readily understand simple fraud-proof mechanisms over advanced crypto. 

Overall, both are deemed low risk from a compliance perspectives.

Customer Support

  • ZK-Rollup networks like StarkNet offer multi-language support through their interactive Discord and Forum communities as well as direct email support. 
  • Optimism and Arbitrum also provide 24/7 multiplayer support on Discord, Twitter, Github, and direct email.

While support quality is similar, ZK-Rollup communities tend to be smaller for now, potentially leading to longer response times. Optimistic Rollup support benefits from larger, more mature ecosystems.

Mobile Applications

  • StarkNet and zkSync have basic mobile apps focused on wallet connectivity and token transfers, rated 3.5/5 stars on average. Arbitrum and Optimism feature robust mobile dApps like matcha.xyz (4.7/5 stars) and zapper.fi integration.
  • Optimistic Rollup mobile experiences are generally more full-featured for DeFi usage thanks to longer development histories and larger developer communities/funding.

Supported Countries

Both ZK-Rollups and Optimistic Rollups are decentralized, borderless networks. As such, they are globally accessible from any country where the Ethereum mainnet can be accessed, with no particular restrictions.

User Experience

  • StarkNet and zkSync provide developer tools, intuitive UI libraries, and documentation to simplify dApp building. However, their UIs can be less polished for end-users compared to DEXs like Matcha built atop Optimism, which boasts sleek trading experiences.
  • Optimistic Rollups also benefit from ecosystem effects, as existing Ethereum tooling like MetaMask seamlessly integrate with rollup functionality to optimize usability. 

Overall, Optimistic Rollups currently offer a more cohesive user experience, while ZK rollups are rapidly catching up and offer monetary incentive programs to fuel developer growth.

Community and Reviews

  • Optimism hosts active forums on Reddit and Twitter exceeding 13K members, with Arbitrum’s Discord attracting over 50K. 
  • ZK rollups cultivate growing yet smaller communities via Telegram, Matrix, and forums.

User reviews note Optimistic Rollups enable fast, affordable DeFi usage, while ZK rollups impress with cryptography-backed security. As both networks expand, sentiment within the Ethereum builder community remains positive towards ZK and Optimistic Rollups as essential scaling technologies.

Final Recommendation

For most Ethereum projects, ZK-Rollups are the preferable layer 2 scaling solution thanks to their mathematically guaranteed security and inherent privacy features. Despite higher proof generation costs, the cryptographic validity proofs underpinning ZK-Rollups provide stronger decentralization and fraud-proofing than Optimistic Rollups can offer. For applications where censorship-resistance and completely trustless transactions are critical, the advanced security assurances of ZK-Rollup networks like StarkNet and zkSync outweigh their current usability shortcomings compared to Optimistic Rollups.

FAQS

What are the disadvantages of ZK-rollups?

While ZK-rollups provide enhanced security and privacy, some disadvantages include higher costs due to complex ZK proof generation requiring specialized hardware. This can potentially lead to centralization risks if too few nodes validate proofs. ZK-rollups also have a steeper learning curve for developers due to incompatible cryptography-focused programming models.

What is a optimistic rollup?

Optimistic rollups are Layer 2 blockchain scaling solutions that bundle many off-chain transactions into a single on-chain transaction using fraud proofs, assuming transactions are valid unless proven otherwise. This provides greater scalability than standalone blockchains, at the cost of relying on irrational validator behavior being disincentivized via slashing conditions in case of disputes.

What is the difference between side chain and ZK rollup?

A side chain is an entirely separate blockchain that operates parallel to the main chain, requiring asset transfers between the two chains via bridging. In contrast, a ZK rollup is an extension of the main Ethereum blockchain that submits validity proofs without increasing blockchain size. ZK rollups provide stronger security than side chains as their validity is ultimately dependent on the Ethereum mainnet.

What is the difference between arbitrum and optimism?

Both Arbitrum and Optimism are leading optimistic rollup platforms, but differ in a few ways:

  • Arbitrum is a general-purpose rollup while Optimism focuses on supporting EVM compatibility
  • Arbitrum runs on AnyTrust execution where only 1/3rd of validators need to be honest, vs 2/3rds for Optimism
  • In terms of adoption, Optimism currently has a higher TVL of $2B compared to Arbitrum’s $1B
  • Arbitrum is working on new capabilities like C/C++ support via Project Spirit, while Optimism remains EVM-focused

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By Molly Tallor
Molly's extensive experience in Crypto and trading provides a strong foundation for analyzing market trends, news, and everything about Crypto. With her expertise in technical and fundamental analysis, she excels at identifying profitable opportunities and effectively managing risks. If you would like to contact the editorial team, you can reach Molly at [email protected] VIEW ALL MY POSTS
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