# Weighted Voting on the Blockchain: Improving Consensus in Proof of Stake Protocols

## TL;DR

This paper proposes a weighted voting scheme for Proof of Stake blockchain protocols, enhancing consensus robustness by dynamically adjusting validator influence based on their voting behavior and rewards.

## Contribution

It introduces a formal framework for weighted voting in PoS protocols, optimizing collective decision-making and improving fault tolerance.

## Key findings

- Weighted voting increases consensus robustness.
- Validators' influence can be optimized via multiplicative weights.
- The approach is supported by numerical and analytical analysis.

## Abstract

Proof of Stake (PoS) protocols rely on voting mechanisms to reach consensus on the current state. If an enhanced majority of staking nodes, also called validators, agree on a proposed block, then this block is appended to the blockchain. Yet, these protocols remain vulnerable to faults caused by validators who abstain either accidentally or maliciously. To protect against such faults while retaining the PoS selection and reward allocation schemes, we study weighted voting in validator committees. We formalize the block creation process and introduce validators' voting profiles which we update by a multiplicative weights algorithm relative to validators' voting behavior and aggregate blockchain rewards. Using this framework, we leverage weighted majority voting rules that optimize collective decision making to show, both numerically and analytically, that the consensus mechanism is more robust if validators' votes are appropriately scaled. We raise potential issues and limitations of weighted voting in trustless, decentralized networks and relate our results to the design of current PoS protocols.