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Ethereum Classic Rocked by Second 51% Attack This Week

2 mins
Updated by Kyle Baird
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In Brief

  • The ETC network experienced a second 51% attack this week.
  • An unknown amount was stolen while the attacker netted approximately $94,000 in block rewards.
  • The initial attack resulted in the loss of $5.68 million worth of ETC.
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Ethereum Classic has experienced yet another malicious 51% attack—the second in under a week. Binance has frozen all Ethereum Classic deposits and withdrawals.
Reports have shown that a 51% attack on the Ethereum Classic blockchain reorganized 4,000 blocks on the chain. The attack was reported at around 3:30 AM UTC by Ethermine’s parent company Bitfly. This is the second attack that Ethereum has faced this week. Reports show that between Jul 31 and Aug 1, over 807,000 ETC, worth $5.68 million, was stolen. Blockchain data intelligence firm Bitquery said that the attacker spent $192,000 worth of Bitcoin to obtain the network hashing power to execute the attack. The Ethereum Classic team responded by asking related services like exchanges and mining pools to raise confirmation times. The amount of stolen has yet to be confirmed, but it’s estimated that just under $94,000 in block rewards had been claimed. Binance has suspended all Ethereum Classic withdrawals and deposits as a result of the attack. Ethereum Classic’s network hash rate and difficulty have dropped significantly in this time, with the former down by 18.65% and the latter down by 11.90%.

Ethereum Classic Can’t Catch a Break

The first of the recent attacks occurred between Jul 31 and Aug 1. It saw the attacker double-spend $5.6 million, as well as earn 13,000 ETC in mining rewards. The attacker mined nearly 4,300 blocks and stopped soon after the attack. This cost him or her 17.5 BTC, or $192,000. The incident sparked a conversation about the security of the network, which today’s attack will only fuel further. BitQuery said that the attack was sophisticated, and required a deep understanding of the Ethereum Classic architecture. The attack went unnoticed for several days before it was fully uncovered. Ethereum Classic (ETC)

Vitalik Weighs In

Vitalik Buterin suggested that ETC switch to Proof-of-Stake (PoS), saying that it is of lower risk than Proof-of-Work (PoW): In June 2019, ETC had undergone a hard fork to reduce block mining times. Reportedly, this was done to give network participants more time to choose a long-term consensus algorithm. Ethereum (ETH) is preparing itself for a PoS transition with its highly-anticipated ETH 2.0 upgrade. The next generation of Ethereum aims to bring greater scalability and a PoS protocol to facilitate large-scale use of the network.
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Rahul Nambiampurath
Rahul Nambiampurath's cryptocurrency journey first began in 2014 when he stumbled upon Satoshi's Bitcoin whitepaper. With a bachelor's degree in Commerce and an MBA in Finance from Sikkim Manipal University, he was among the few that first recognized the sheer untapped potential of decentralized technologies. Since then, he has helped DeFi platforms like Balancer and Sidus Heroes — a web3 metaverse — as well as CEXs like Bitso (Mexico's biggest) and Overbit to reach new heights with his...
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