web3: Bitcoin's potential fork approaches, developers warn of replay attack risks
CoinDesk
14h ago
Ai Focus
A potential fork related to BIP-110 may trigger this weekend. Developers remind token holders not to transfer their assets for now to prevent a replay attack that could result in the real BTC being transferred out.
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围绕 BIP-110 提案的比特币潜在分叉,可能在本周末进入敏感阶段。开发者提醒,如果少数链真的出现,持币人试图出售分叉后获得的新币时,可能遭遇重放攻击,连主链上的真实 BTC 也一并转出。

出售分叉币或波及主链

分叉一旦发生,持币人在两条链上会先得到相同余额。部分买家可能会高价收购新链代币,看起来像是额外获得的一笔收益。

但在分叉初期,两条链会接受相同格式的交易。用户若签名并发送一笔卖出分叉币的交易,买家就可能把同一笔交易广播到比特币主链,导致等额真实 BTC 也被发送到同一地址。

当前没有自动重放保护

报道提到,这类风险成立的前提,是分叉链在初期没有内置重放保护。用户无法天然区分一笔交易只在分叉链有效,还是也能在主链执行。

按当前时间表,BIP-110 对交易数据的限制预计要到 9 月初附近才会生效。在这之前,若用户想安全转移资产,通常需要先把两条链上的余额人为分离,再分别操作。

BIP-110 触发路径受关注

BIP-110 是一项存在争议的比特币提案,目标是在一年时间内限制图片、文本等非支付数据进入比特币交易。原本它需要矿工在 2016 个区块的窗口中,对至少 1109 个区块进行标记,才算获得 55% 支持。

不过,提案还设置了另一种触发方式:从预计本周末到来的区块高度 961,632 开始,运行 BIP-110 软件的节点将拒绝未带标记的区块,即使矿工整体并未同意。若少数矿工继续延长兼容 BIP-110 的链,而大多数矿工维持现有主链,两套交易历史就可能并行出现。

  • 关键区块高度为 961,632
  • 相关限制预计 9 月初生效
  • 矿工支持门槛为 55%

开发者 Kevin Loaec 本周在 X 上表示,对不了解分币操作的普通用户来说,当前更稳妥的做法是暂不移动相关比特币。因为只要资产没有移动,就不存在可被复制的已签名交易。

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