论文标题
比特币增强验证证明安全：可能性和不可能
Bitcoin-Enhanced Proof-of-Stake Security: Possibilities and Impossibilities
论文作者
论文摘要
比特币是世界上最安全的区块链，得到其工作证明矿工的巨大哈希的支持。列出的连锁店的节能效果，具有快速终止性，但面临几个安全问题：易感性不可扣除的长距离安全攻击，低的弹性弹性和难以通过低代币估值引起的难度。我们表明，这些安全问题是没有外部受信任来源的任何POS链中固有的，并提出了一个新协议Babylon，该协议在该协议上进行了现成的POS协议检查点在比特币上以解决这些问题。不可能的结果证明了巴比伦的最优性。巴比伦的用例是减少股份提取延迟：我们的实验结果表明，使用巴比伦的几周可以减少此延迟，从现有的POS链中的几周减少到小于5小时，每年的交易成本低于10K美元，以将检查点发布到比特币上。
Bitcoin is the most secure blockchain in the world, supported by the immense hash power of its Proof-of-Work miners. Proof-of-Stake chains are energy-efficient, have fast finality but face several security issues: susceptibility to non-slashable long-range safety attacks, low liveness resilience and difficulty to bootstrap from low token valuation. We show that these security issues are inherent in any PoS chain without an external trusted source, and propose a new protocol, Babylon, where an off-the-shelf PoS protocol checkpoints onto Bitcoin to resolve these issues. An impossibility result justifies the optimality of Babylon. A use case of Babylon is to reduce the stake withdrawal delay: our experimental results show that this delay can be reduced from weeks in existing PoS chains to less than 5 hours using Babylon, at a transaction cost of less than 10K USD per annum for posting the checkpoints onto Bitcoin.
