Ethereum Classic has experienced "multiple 100+" reorg attack

Security • January 7, 2019, 1:12PM EST
UPDATED: January 7, 2019, 3:25PM EST
The Block

Ethereum Classic, the smart contact platform, appears to be experiencing a block reorganization attack (reorg), according to blockchain explorer and mining pool, Etherchain. A reorg attack could potentially delay or reverse transactions on a blockchain. According to Etherchain, there was "a successful 51% attack on the Ethereum Classic network with multiple 100+ block reorganization." On Monday morning, the official Ethereum Classic Twitter account recommend that all exchanges and mining pools increase their confirmation times to over 400 blocks on ethereum classic withdrawals and deposits.

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Update: Coinbase confirms that it had detected reorg attacks on the Ethereum Classic network that included 88,500 ETC (~$460,000) in double spends.

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Steven Zheng is a researcher for The Block. He joined The Block in August 2018. Steven graduated from St. John’s University with a degree in economics. Previously, he covered blockchain and crypto at Radicle, a startup analytics firm. He also had brief stints at Cheddar, a media startup, and Bowery Capital, a venture capital firm. He owns bitcoin. Follow Steven on Twitter at: @Dogetoshi

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