获得一致的历史记录 by sherryzhou

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· @sherryzhou ·
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获得一致的历史记录
我们希望从 XCMP 获得的一个关键特性是规范平行链区块,即那些我们最终认可它已经发生的平行链区块。这意味着,在当前的平行链区块中,只对那些从平行链区块发送的消息起作用,这些平行链区块本身既规范又早于当前平行链区块。

中继链定义了所有平行链的历史记录。例如,来自平行链B的区块头在中继链区块 301 中,可以说其作用于区块 300 之前的所有消息。如果作用于区块 300 之前的所有消息,那就作用于平行链 A 的区块发送的消息,并且仅当 A 平行链区块头出现在中继链 300 区块或更早的时候才会起作用。

这意味着中继链需要在验证消息方面发挥作用。然而,由于我们不能在这些平行链区块头中放置大量数据,中继链本身不应该具有消息的有效负载。相反,我们通过使用嵌套的 Merkle 树来有效地保持一致的历史。对应于已发送消息的平行链区块头将包含一个消息根哈希,即 Merkle 树的根。反过来,这个Merkle 树的叶子是从这个平行链到另一个平行链的消息散列链的区块头。

这意味着有一个包含每个消息哈希的哈希序列,让从一个平行链到另一个平行链的所有已发送消息得以验证。这允许收集人通过首先显示消息根在中继链中,然后证明这些是来自消息根哈希的消息,从而构造一个由许多散列组成的证据,证明它们对消息起作用,并且只对它们应该起作用的消息起作用。

有关此主题的详细信息,请参见:
https://research.web3.foundation/en/latest/polkadot/XCMP.html


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