Lightweight Virtual Payment Channels

Lightweight Virtual Payment Channels
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轻量级虚拟支付渠道

DOI:
10.1007/978-3-030-65411-5_18
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发表时间:
2020
期刊:
Lecture Notes in Computer Science (CANS 2020)
影响因子:
--
通讯作者:
Tanaka Keisuke
Tanaka Keisuke
中科院分区:
--
文献类型:
--
作者:
Jourenko Maxim;Larangeira Mario;Tanaka Keisuke

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区块链系统具有严重的可扩展性限制,例如,长时间的确认延迟。第2层协议旨在解决这些限制。此类协议中最突出的类别是支付通道网络,比特币的闪电网络,其中成对的参与者创建可以连接到网络中的通道。这些允许在网络上进行支付,而无需与区块链进行交互。缺点是支付路径内的所有中间节点必须在线。Dziembowski等人最近提出的虚拟渠道(CCS'18)允许没有这种限制的支付。然而,这些只能在具有智能合约功能的区块链上实现,因此限制了其适用性。我们的工作提出了轻量级虚拟支付渠道的概念,即只需要时间锁和多重签名,在更大范围的区块链系统上启用虚拟渠道,其中一个主要的例子是比特币。更具体地说,这项工作的其他贡献是(1)介绍了我们的构造的完全成熟的形式化,以及(2)在Canetti的UC框架中提出了基于模拟的安全性证明。
Blockchain systems have severe scalability limitations e.g., long confirmation delays. Layer-2 protocols are designed to address such limitations. The most prominent class of such protocols are payment channel networks e.g., the Lightning Network for Bitcoin where pairs of participants create channels that can be concatenated into networks. These allow payments across the network without interaction with the blockchain. A drawback is that all intermediary nodes within a payment path must be online. Virtual Channels, as recently proposed by Dziembowski et al. (CCS’18), allow payments without this limitation. However, these can only be implemented on blockchains with smart contract capability therefore limiting its applicability. Our work proposes the notion of –Lightweight– Virtual Payment Channels, i.e. only requiring timelocks and multisignatures, enabling Virtual Channels on a larger range of blockchain systems of which a prime example is Bitcoin. More concretely, other contributions of this work are (1) to introduce a fully-fledged formalization of our construction, and (2) to present a simulation based proof of security in Canetti’s UC Framework.
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