怎样理解Algorand的永不分叉？

什么是最终性(Finality)

Finality isthe assurance or guarantee that cryptocurrency transactions cannot be altered, reversed, or canceled after they are completed.

最终性(Finality)是一个过程，通过这个过程，给定链中的交易可以被认为是最终的，因此一个交易不会或极不可能被回滚，并且可以被信任为永久的。

英文原文：

Algorand cannot fork. What does that actually mean? It means that a transaction is atomic (all or none) and once written to the blockchain, cannot be erased, repudiated, or contradicted by another transaction. The blockchain can never exist as a composite of smaller chains and maintains unity. It can't be spliced into partitions either by accident or through manipulation.

Other definitions of forking refer to protocol updates and upgrades. Those are irrelevant here, and that should be clarified to those with that definition in mind, because it isn't the point.

So why is it important for a financial system to never fork? Can't we just wait for some number of blocks on Bitcoin, Ethereum, or Cardano and have confidence that we achieved finality through weak consistency? Absolutely not.

Example: If you disconnected two countries that contained the majority of Bitcoin's mining power, the Bitcoin network would still produce blocks! Isn't that wonderful? The network would still work in the event of an outage like that, indeed, but when reconnected together, the entire smaller chain of transactions produced by the smaller country would be erased out of existence. That means you could have gotten paid as a merchant, waited for 100 blocks, and still ended up with nothing after the networks got reconnected.

The correct number of blocks for finality should be one. Once a transaction is observable, it should be final. The merchant should have complete confidence that a transaction either happens or doesn't happen. That is what makes Algoranda forkless blockchain.

原文链接：https://www.reddit.com/r/AlgorandOfficial/comments/n2redr/we_need_some_forking_clarity/

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编译者/作者：田小田

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