SoK: Payment Channel Networks

TL;DR

This survey paper reviews the fundamental aspects, recent advancements, and unresolved challenges of Payment Channel Networks, which are crucial for scalable, efficient, and private offchain blockchain transactions.

Contribution

It provides a comprehensive overview of PCN research, highlighting key developments and identifying critical open problems for future exploration.

Findings

Survey of routing, virtual channels, and rebalancing protocols

Identification of key challenges in PCN infrastructure design

Guidance for future research directions in PCNs

Abstract

Payment Channel Networks (PCNs) have been proposed as an alternative solution to the scalability, throughput, and cost overhead problems associated with blockchain transactions. By facilitating offchain execution of transactions, PCNs significantly reduce the burden on the blockchain, leading to faster transaction processing, reduced transaction fees, and enhanced privacy. Despite these advantages, the current state-of-the-art in PCNs presents a variety of challenges that require further exploration. In this paper, we survey several fundamental aspects of PCNs, such as pathfinding and routing, virtual channels, state channels, payment channel hubs, and rebalancing protocols. We aim to provide the reader with a detailed understanding of the various aspects of PCN research, highlighting important advancements. Additionally, we highlight the various unresolved challenges in this area. Specifically, this paper seeks to answer the following crucial question: What are the various interesting and non-trivial challenges in fundamental infrastructure design leading to efficient transaction processing in PCN research that require immediate attention from the academic and research community? By addressing this question, we aim to identify the most pressing problems and future research directions, and we hope to inspire researchers and practitioners to tackle these challenges to make PCNs more secure and versatile