On 1/5/2019, Coinbase detected a deep chain reorganization of the Ethereum Classic blockchain. In order to protect customer funds, we immediately paused interactions with the ETC blockchain.

Updated Jan. 7, 2019–10:27pm PT: At time of writing, we have identified a total of 15 reorganizations, 12 of which contained double spends, totaling 219,500 ETC (~$1.1M). No Coinbase accounts have been impacted by the attack.

Updated March 11, 2019–11:20am PT: We have now re-enabled sends and receives of ETC. Please note that transactions may take 24 hours, or longer, to be processed by the network due to the large number of confirmations required.


Mark Nesbitt

Security Engineer at Coinbase

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