Public blockchains inherently offer low throughput and high latency, motivating off-chain scalability solutions such as Payment Channel Networks (PCNs). However, existing PCNs suffer from liquidity fragmentation-funds locked in one channel cannot be reused elsewhere-and channel depletion, both of which limit routing efficiency and reduce transaction success rates. Multi-party channel (MPC) constructions mitigate these issues, but they typically rely on leaders or coordinators, creating single points of failure and providing only limited flexibility for inter-channel payments. We introduce Hypergraph-based Multi-Party Payment Channels (H-MPCs), a new off-chain construction that replaces bilateral channels with collectively funded hyperedges. These hyperedges enable fully concurrent, leaderless intra- and inter-hyperedge payments through verifiable, proposer-ordered DAG updates, offering significantly greater flexibility and concurrency than prior designs. Our implementation on a 150-node network demonstrates a transaction success rate of approximately 94% without HTLC expiry or routing failures, highlighting the robustness of H-MPCs.

翻译：公有区块链本质上具有低吞吐量和高延迟的特点，这推动了诸如支付通道网络（PCNs）等链下可扩展性解决方案的发展。然而，现有的PCNs存在流动性碎片化——锁定在一个通道中的资金无法在其他地方重复使用——以及通道耗尽问题，这两者都限制了路由效率并降低了交易成功率。多方通道（MPC）结构缓解了这些问题，但它们通常依赖于领导者或协调者，从而产生了单点故障，并且仅为跨通道支付提供了有限的灵活性。我们引入了基于超图的多方支付通道（H-MPCs），这是一种新的链下结构，用集体资助的超边取代了双边通道。这些超边通过可验证的、提议者排序的有向无环图（DAG）更新，实现了完全并发的、无领导者的超边内和超边间支付，提供了比先前设计显著更高的灵活性和并发性。我们在一个150节点的网络上的实现表明，在没有哈希时间锁合约（HTLC）过期或路由失败的情况下，交易成功率约为94%，突显了H-MPCs的鲁棒性。