2-hop Blockchain: Combining Proof-of-Work and Proof-of-Stake Securely
2-hop Blockchain: Combining Proof-of-Work and Proof-of-Stake Securely
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DOI：
10.1007/978-3-030-59013-0_34
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
Tuyet Duong;Lei Fan;Jonathan Katz;Phuc Thai;Hong-Sheng Zhou
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文献类型：
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作者：
Tuyet Duong;Lei Fan;Jonathan Katz;Phuc Thai;Hong-Sheng Zhou
类似比特币的区块链使用工作量证明（PoW）机制，如果大部分计算能力处于诚实玩家的控制之下，则安全性保持不变。然而，这一假设最近受到了严重的挑战，如果违反这一假设，类似比特币的系统就会失败。在这项工作中，我们提出了一个新的2跳区块链协议，结合了PoW和权益证明（PoS）机制。我们的分析表明，只要诚实的参与者控制了大多数集体资源（包括计算能力和赌注），该协议是安全的。特别是，即使对手控制了超过50%的计算能力，如果诚实的各方在系统中拥有足够高的利益，安全性仍然存在。作为一个额外的贡献，我们的协议也仍然是安全的适应性对手。
Bitcoin-like blockchains use a proof-of-work (PoW) mechanism, where security holds if the majority of the computing power is under the control of honest players. However, this assumption has been seriously challenged recently, and Bitcoin-like systems fail if this assumption is violated. In this work we propose a novel2-hopblockchain protocol that combines PoW and proof-of-stake (PoS) mechanisms. Our analysis shows that the protocol is secure as long as the honest players control a majority of thecollectiveresources (which consist of both computing power and stake). In particular, even if the adversary controls more than 50% of the computing power, security still holds if the honest parties hold sufficiently high stake in the system. As an added contribution, our protocol also remains secure against adaptive adversaries.