Consensus bug causes Ethereum chain to break

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Key takeaways A bug in an older version of the Ethereum Geth software client caused a chain split on the Ethereum mainnet. Flexpool, BTC.com and Binance pools are said to have exploited the old version. Members of the crypto community have advised users to avoid making transactions on the network until the issue is resolved. Share this article

The Ethereum blockchain split due to a bug in the old version of Geth.

Bug leads to Ethereum Fork

A bug affecting the old version of the Ethereum Geth network client causes the nodes to separate from the main network. There is a risk that the bug will lead to double spend attacks and loss for users doing transactions.

A chain break has occurred on the Ethereum mainnet. The issue has been resolved in the previously announced version v1.10.8. Please update your nodes, if you haven’t already!

– Go Ethereum (@go_ethereum) August 27, 2021

Although the bug was fixed in Geth v1.10.8., Many nodes are believed to be running the old, unpatched versions.

Tim Beiko, a member of Ethereum’s “AllCoreDevs”, suggested that Flexpool, BTC.com and the Binance pools were running the old version of Geth.

The consensus bug also affects non-Ethereum chains including Polygon, Binance Smart Chain, xDAI, and others. Rumors are circulating on Twitter that the bug may have already been exploited on both Ethereum and Binance Smart Chain.

Polygon tweeted that most validators in their network have already updated to the latest Geth / Bor version.

Fortunately, the majority of Ethereum miners are running the updated version of the Geth client, which means there is no risk of hardfork. As for non-mining nodes running older versions of Geth, they are effectively prohibited from accessing the mainnet.

Now that the exploit is in the wild, it can be replayed on other networks like Polygon, BSC, xDAI, Görli. Be careful, try not to make economically significant transactions until things are settled.

– banteg (@bantg) August 27, 2021

As a precaution, members of the crypto community have advised users against making large transactions on Ethereum and other chains until the issue is resolved and the majority of nodes update to the latest one. Geth software version. “Don’t tx for a while until you’re confirmed, unless you’re sure you’re submitting to the latest geth,” DeFi developer Andre Cronje wrote. “Take a walk outside, we all need it.”

Disclosure: At the time of writing, the author of this feature owned ETH. Andre Cronje is a shareholder of Crypto Briefing.

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