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Emily - A Beginner's Guide to L2s, ZK, and WTF People are Talking About on Panels
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Emily - A Beginner's Guide to L2s, ZK, and WTF People are Talking About on Panels

Secret3 Secret3 November 25, 2024 3 min read
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Emily - A Beginner's Guide to L2s, ZK, and WTF People are Talking About on Panels
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1. Understanding Optimistic vs. ZK Roll-Ups

Emily emphasized the fundamental differences between optimistic and ZK roll-ups, noting that optimistic roll-ups start with the assumption that transactions are valid, necessitating a challenge period for fraud proofs during withdrawals. This requires at least one honest node to ensure security, as the method relies on community members to dispute invalid transactions within a seven-day timeframe. In contrast, ZK roll-ups provide immediate verification by submitting a validity proof alongside the data, which offers enhanced safety and faster finality since they don't require a challenge period.

2. Importance of Data Availability and Costs

Emily pointed out that all interactions with Ethereum can be costly, particularly concerning data availability. This is especially relevant when posting transaction data back to Ethereum, necessitating efficient mechanisms like the introduction of EIP 4844, which allows for the utilization of a different data structure called blobs. These blobs represent temporary data storage that enhances transaction efficiency and reduces exposure to market fluctuations on Ethereum, making roll-ups more economically viable.

3. The Complexity of Developing ZK EVMs

According to Emily, developing ZK EVMs is a complex task that has led to the emergence of various types, each with its own pros and cons. She articulated that different ZK EVM types cater to different developer needs while emphasizing that the high-level language compatibility can influence security guarantees. Developers must balance their choices based on performance, security, and the existing Ethereum ecosystem, which can present challenges but also opportunities for innovation.

4. Evolution of Rollup Stages and Their Security Guarantees

Emily elaborated on the stages of rollups as defined by L2Beat, where most rollups operate at stage zero with centralized operators. As technology progresses, the introduction of smart contract governance and security councils at stage one leads to improved decentralization. By stage two, rollups become fully managed by smart contracts, enhancing security and removing centralized control, which is vital for the long-term scalability and reliability in decentralized networks.

5. The Role of Zero-Knowledge Proofs in Privacy Solutions

In her presentation, Emily highlighted zero-knowledge proofs (ZK proofs) as critical for privacy, allowing one party (the prover) to convince another (the verifier) that they possess certain knowledge without revealing the information itself. This feature is crucial for creating privacy-focused applications in the blockchain realm, emphasizing completeness, soundness, and zero-knowledge properties that collectively enhance trust and security within decentralized applications.

6. The Contrast Between SNARKs and STARKs

Emily differentiated between SNARKs (Succinct Non-Interactive Arguments of Knowledge) and STARKs (Scalable Transparent Arguments of Knowledge), noting that while SNARKs require a trusted setup for creating proofs, STARKs do not involve this complexity. This distinction has implications for scalability, with STARKs typically being better suited for large computations but resulting in larger proof sizes, impacting the cost-effectiveness of verifying these proofs on Ethereum.

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