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Blockchair core developer: There is an unannounced hard fork event in Ethereum, because some node clients have not been upgraded

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Something similar happened 7 years ago

Rhythm BlockBeats news, November 11, Blockchair core developer Nikita Zhavoronkov reviewed the events that took place on the Ethereum blockchain this afternoon. According to him, at some point today, Ethereum developers introduced code changes that resulted in a fork in the Ethereum chain starting today at block height 11234873 (07:08 UTC).

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The non-upgraded nodes (such as Blockchair, Infura, miners, etc.) were trapped on the minority chain. This process lasted for 2 hours, about 30 blocks. Technically, this is an unannounced hard fork event. Something similar happened 7 years ago when the database was upgraded: https://github.com/bitcoin/bips/blob/master/bip-0050.mediawiki. The result now is that the nodes that have not been upgraded have also been repaired, upgrade geth and run debug.setHead(11234872)

Cobo co-founder Shenyu expressed the same opinion, he said that the Infura downtime is a An accidental fork occurred due to an incompatibility between the old Ethereum node version and the new one. This situation led to an opportunity for a low-cost double-spending attack test in the afternoon.