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Ethereum Classic Blockchain Splits Due to Reorg by a Single Miner

On August 1, several figures associated with Ethereum Classic (ETC) took to Twitter to inform the community of issues with the ETC blockchain. Among the first was Ethereum Foundation member Hudson Jameson who stated that: “Exchanges need to pause deposits and withdrawals.”

The official Twitter page of ETC and James Wo, founder of Ethereum Classic Labs, both confirmed the issue. A Diagnosis report was soon released to explain that the offending miner was identified. The report added that miners should “Continue mining the chain as-is,” adding that any transactions issued during the previous 12-hour period were possibly not mined in the same order they were supposed to be, but they will be re-submitted back into the mempool. 

Another situation report that was released later in the day, outlined that the reorg was not intention, and came about due to the miner using old software and going offline for the 12 hour period.

As suggested by a mining solutions provider Bitfly, a network reorganisation of 3693 blocks has taken place at block 10904146. According to the message: “This caused all state pruned nodes to stop syncing.” 

The event was first thought to be a 51% attack on the network, although his notion was later dismissed by the team behind ETC. At the start of 2019, a confirmed 51% attack on ETC took place, raising concerns around the Proof-of-Work mining model.




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