Concetti Chiave
This work introduces a novel, fast Confirmation Rule for the LMD-GHOST component of the Ethereum Gasper consensus protocol, aiming to achieve fast block confirmations while balancing safety guarantees.
Sintesi
The paper presents a Confirmation Rule for the Ethereum Gasper consensus protocol, which consists of two key components: LMD-GHOST and FFG-Casper.
The authors first develop a Confirmation Rule for the LMD-GHOST component, treating it as an independent protocol. This rule is based on two safety indicators: Qn_b, which quantifies the support ratio for a specific block b relative to the total committee weight, and Pn_b, which measures the honest proportion of support for block b.
The authors show that with a suitable value of Pn_b, a user can reliably confirm block b. However, as direct observation of honest support by users is not feasible, the authors demonstrate how, under certain adversarial conditions, reaching a specific threshold of Qn_b, which is observable, allows for the inference of Pn_b, thereby enabling the confirmation of block b.
The authors then build upon this initial framework by exploring how the FFG-Casper component influences LMD-GHOST, thereby enhancing the initial Confirmation Rule. This refined Confirmation Rule aims to achieve fast block confirmations by adopting a heuristic that balances speed against reduced safety guarantees, potentially confirming blocks immediately after their creation under optimal conditions.
The paper also discusses a variant of the Confirmation Rule that operates under less stringent assumptions than the one introduced in the main text.
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