Bitfly officially tweeted that ETC encountered another large-scale 51% attack today. The attack has resulted in the reorganization of more than 4000 blocks. Bitfly reminded that unless the official notified further, the current mining pool payment is invalid. At the same time, the government encourages all miners to switch ETH pools on the official website. Blockchain data analysis company Bitquery released an investigation report on the second 51% attack of ETC. The report shows that the initiator of this attack and the initiator of the first attack were the same miner. The attackers profited at least 1.68 million US dollars from this attack.