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BTC不完美但够好 (中4篇) 安全分析 比特币作...-转载
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安全分析& b' G' ^1 r! b; _
6 J9 {+ R+ y; Z+ x) N比特币作为一种新兴的开源技术拥有非常强大的安全记录,但并非完美无缺。
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9 Z6 k& v n$ Q1 t% V( F4 F2010 年,当比特币还是全新的、几乎没有市场价格的时候,节点客户端出现了通货膨胀错误,中本聪用软分叉修复了这个错误。
$ e" f9 ^/ N+ \4 W! @ p+ j" w* V. c4 k5 N3 y; M' X% j
2013 年,由于疏忽,比特币节点客户端更新意外地无法兼容之前(且广泛使用)的节点客户端,导致意外的链分裂。几个小时内,开发人员分析了问题,并告诉节点运营商返回到先前的节点客户端,解决了链分裂问题。自那时起的十多年时间,比特币网络一直保持着完美的 100% 正常运行时间。在此期间,甚至 Fedwire 也曾遭遇过中断而未能实现 100% 的正常运行时间。+ Q9 W4 B$ e! A: B- Z8 w
( {1 M; J" b5 C2 I) @# ?( ^+ w2018 年,比特币节点客户端意外添加了另一个通货膨胀漏洞。然而,这个问题在被利用之前已被开发人员识别并谨慎修复,因此在实践中未引起问题。
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2023 年,人们开始以开发人员未曾预料的方式使用 SegWit 和 Taproot 软分叉升级,包括将图像插入比特币区块链的签名部分。虽然这本身不是一个错误,但它显示了代码的某些方面可能以非预期方式使用的风险,这意味着在未来执行升级时需要持续保持保守。7 K1 Y; ?- d% j0 B& V% Y$ X
6 b5 b7 s/ W+ z/ [6 K
比特币面临许多计算机系统都存在的「 2038 年问题」。到 2038 年,对于许多计算机系统来说,用于 Unix 时间戳的 32 位整数将耗尽秒数,从而导致错误。然而,由于比特币使用无符号整数,因此直到 2106 年才会用完。可以通过将时间更新为 64 位整数或将区块高度放入 32 位整数来解决此问题。; G% p% {4 ^* R7 C; O$ K# c
3 C3 a; y; y9 j, m. V比特币确实可以从技术问题中恢复。基本解决方案是去中心化网络上的节点运营商回滚到错误存在之前的更新,并拒绝导致问题的新更新。3 @2 @% u$ d: c! e) W
# Y2 U+ o) a0 P9 D然而,我们必须想象最坏的情况。如果一个技术问题多年来未被注意到,并成为广泛节点网络的一部分,并且然后被发现并被利用,那么这就是一个更严重的问题,灾难性的问题。虽然还不是无法恢复,但这将是一个严重的打击。# D8 ~: x; J$ S% M K" Q
" h, b5 D2 c# M1 c$ w& m/ t: _由于比特币的代码库存在了数年甚至数十年,它变得更加坚固并受益于林迪效应。
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图片% h, n$ K4 P0 \( E. i/ I
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总体而言,随着时间的推移,主要错误的发生率有所下降,并且自 2013 年以来网络一直保持 100% 的正常运行时间这一事实是引人注目的。" j# b/ y5 Y% l) `! {
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