DPCN: Towards Deadline-aware Payment Channel Networks

TL;DR

This paper introduces DPCN, a framework for deadline-aware payment channel networks that improves transaction success rates and meets deadline requirements by dynamically scheduling and splitting transactions based on deadlines.

Contribution

The paper presents a systematic framework DPCN that incorporates deadline-aware transaction splitting, scheduling, and congestion avoidance to enhance deadline-sensitive payment network performance.

Findings

DPCN achieves higher transaction success ratios compared to existing methods.

DPCN effectively prioritizes near-deadline transactions.

Experiments demonstrate DPCN's ability to meet diverse transaction deadlines.

Abstract

Payment channel is a class of techniques designed to solve the scalability problem of blockchain. By establishing channels off the blockchain to form payment channel networks (PCNs), users can make instant payments without interacting with the blockchain, avoiding the problems of long transaction consensus delays and high transaction fees. Recently, the optimization of PCNs has mainly focused on improving the network throughput via multi-path routing. However, the transaction's atomicity comes at a non-trivial cost for transaction completion latency that affects user experience in deadline-sensitive applications of PCNs. In this paper, we propose a new and systematic framework DPCN to consider the deadlines of transactions for payment channel networks while improving the success ratio of transactions. DPCN is enabled via a synergy of three components: (1) deadline-based dynamic transaction split mechanism that splits the transaction according to current network status and the transaction's deadline; (2) deadline-aware transaction scheduling that prioritizes near-deadline transactions; (3) deadline-aware transaction congestion avoidance algorithm, which uses a path window to balance transactions with different deadlines. Our extensive experiments show that compared with existing methods, DPCN can well meet the needs of transactions with different deadlines and ensure a higher success ratio for transactions in the payment channel networks.