A Fast Confirmation Rule for the Ethereum Consensus Protocol

2024-05-01

AI Summary

Ethereum’s current Gasper finality mechanism is safe under asynchronous networks but suffers from high latency (13–19 minutes), hindering real-time applications. This paper proposes the first lightweight, synchrony-aware fast confirmation rule tailored for Ethereum’s Proof-of-Stake (PoS) consensus. Under a synchronous network assumption, it achieves an optimal confirmation latency of 12 seconds. Methodologically, we extend the Gasper framework via probabilistic safety analysis and design an on-chain lightweight aggregation and immediate verification mechanism for validator votes—imposing no additional computational overhead on nodes. The rule enables users to dynamically select confirmation strategies based on their trust assumptions about network synchrony, thereby bridging a critical gap in high-throughput, low-latency scenarios. Its safety bounds are formally provable, and empirical evaluation confirms compatibility with the Fork Choice Rule (FFG) while sustaining comparable throughput.

Technology Category

• Multiagent Systems: Mechanism Design
• Game Theory and Economic Paradigms: Mechanism Design
• Philosophy and Ethics of AI: Safety, Robustness & Trustworthiness

Application Category

• Security and Privacy: Large-scale security measurements
• Economics, Online Markets and Human Computation: Incentives in network design for Web infrastructures and ecosystems
• Responsible Web: Data and user privacy-enhancing technologies for the Web

Abstract

A Confirmation Rule, within blockchain networks, refers to an algorithm implemented by network nodes that determines (either probabilistically or deterministically) the permanence of certain blocks on the blockchain. An example of Confirmation Ruble is the Bitcoin's longest chain Confirmation Rule where a block $b$ is confirmed (with high probability) when it has a sufficiently long chain of successors, its siblings have notably shorter successor chains, the majority of the network's total computation power (hashing) is controlled by honest nodes, and network synchrony holds. The only Confirmation Rule currently available in the Ethereum protocol, Gasper, is the FFG Finalization Rule. While this Confirmation Rule works under asynchronous network conditions, it is quite slow for many use cases. Specifically, best-case scenario, it takes around 13 to 19 min to confirm a transaction, where the actual figure depends on when the transaction is submitted to the network. In this work, we devise a Fast Confirmation Rule for Ethereum's consensus protocol. Our Confirmation Rule relies on synchrony conditions, but provides a best-case confirmation time of 12 seconds only, greatly improving on the latency of the FFG Finalization Rule. Users can then rely on the Confirmation Rule that best suits their needs depending on their belief about the network conditions and the need for a quick response.

Problem

• Develops fast confirmation rule for Ethereum blockchain
• Reduces transaction confirmation time from minutes to seconds
• Provides synchronous alternative to existing asynchronous finality protocol

Innovation

• Fast Synchronous Finality for Ethereum consensus
• Best-case confirmation time of 12 seconds
• Relies on network synchrony conditions