流程通道:基于区块链状态通道的流程制定新层

Fabian Stiehle, I. Weber
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引用次数: 1

摘要

对于组织间流程的制定,区块链可以保证流程模型的实施和执行痕迹的完整性。但是,现有的解决方案在吞吐量可伸缩性、延迟以及机密性和透明性之间的次优权衡方面存在缺点。为了解决这些问题,我们建议改变基于区块链的流程制定的基础:从链上智能合约到状态通道,即区块链之上的覆盖网络。状态通道允许进行大多数链下交易,同时大部分保留区块链提供的核心安全属性。我们的建议流程通道是一种模型驱动的方法,用于在状态通道上执行流程,其目的是保留所需的区块链属性,同时尽可能减少链上的占用。我们在这里重点讨论状态通道作为平台的原则方法,以便在各个方向(如延迟和机密性)实现多种未来优化。我们实现我们的方法原型,并定性地(w.r.t.假设和保证)和定量地(w.r.t.正确性和气体成本)评估它。简而言之,虽然状态通道的初始部署工作更高,但通常在几个流程实例之后就会得到回报;只要新的假设成立,担保也就成立。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Process Channels: A New Layer for Process Enactment Based on Blockchain State Channels
For the enactment of inter-organizational processes, blockchain can guarantee the enforcement of process models and the integrity of execution traces. However, existing solutions come with downsides regarding throughput scalability, latency, and suboptimal tradeoffs between confidentiality and transparency. To address these issues, we propose to change the foundation of blockchain-based process enactment: from on-chain smart contracts to state channels, an overlay network on top of a blockchain. State channels allow conducting most transactions off-chain while mostly retaining the core security properties offered by blockchain. Our proposal, process channels, is a model-driven approach to enacting processes on state channels, with the aim to retain the desired blockchain properties while reducing the on-chain footprint as much as possible. We here focus on the principled approach of state channels as a platform, to enable manifold future optimizations in various directions, like latency and confidentiality. We implement our approach prototypical and evaluate it both qualitatively (w.r.t. assumptions and guarantees) and quantitatively (w.r.t. correctness and gas cost). In short, while the initial deployment effort is higher with state channels, it typically pays off after a few process instances; and as long as the new assumptions hold, so do the guarantees.
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