Ethereum Classic Suffers Second 51% Attack In A Week

Ethereum Classic has suffered its second 51% assault in each week after greater than 4,000 blocks had been reorganised Thursday morning.

Mining pool Ethermine’s dad or mum entity Bitfly and crypto trade Binance reportable the reorganisation, declarative all Ethereum Classic payouts, withdrawals and deposits had been suspended as a result of assault. It’s unclear how a raft the assaulter has made.

The reorganised dealing historical past is now the longest chain on the community. However, the vast majority of Ethereum Classic miners – equivalent to mining pool Ethermine – are diligent with to mine on the shorter model of the community.

Developers behind Ethereum Classic declared in a tweet minutes earlier than Bitfly’s report that exchanges and mining swimming pools are advisable to “importantly raise confirmation multiplication on all deposits and incoming dealings” in mild of “recent network attacks.”

A series reorg happens when a celebration good points extra hashing energy than the remainder of the community miners. The resiste can then revision the chain’s historical past and “double-spend” the blockchain’s native forex (on this case, ETC). Hashing energy on Ethereum Classic seems to have cut importantly since Monday, August three falling much 20% from 1.6 TH/s to 1.three TH/s as of press time.

This contemporary assault to Ethereum Classic’s community follows on from a latest assault that occurred between July 29 and August 1, in accordance with blockchain analytics agency Bitquery.

While Ethereum Classic builders ab initio declared the community didn’t undergo from a reorganisation or a 51% assault in this earlier assault, Bitquery declared Wednesday that an assaulter double-spent just a bit over 800,000 ETC (about $5.6 million), and paid about 17.5 BTC ($204,000) to accumulate the hash energy for the assault.

The commercial enterprise worth of Thursday’s 51% assault when it comes to the double spends will not be but recognized. However, at $23.44 per block reward on Ethereum Classic, the assaulter has near for sure attained $93,760 from block rewards alone.

The assault follows the deprecation of the OpenEthereum consumer on July 16. Nearly half of the community’s nodes – together with necessary mining and trade connections – operated on OpenEtheruem software package program which grew to become instantly obsolete following the primary chain reorg July 31.

Ethereum Classic builders have urged node operators to modify to Besu or Multi-geth implementations as quickly as doable.

Ethereum Classic’s value was $7.03 as of press time, down lower than 1% over 24 hours.

Not the primary

The community has suffered main reorg assaults at to the worst degree double inside the final two years.

In the more moderen assault, the culprit affected greater than 807,000 ETC from an unspecified crypto trade to a number of wallets between July 29-31, in accordance with Bitquery.

The assaulter then began mining blocks after buying the hash energy from a mortal on cryptocurrency mining platform Nicehash.

On July 31, the assaulter despatched cash to their very own pockets handle by way of mortalal dealings after which carried out the dealings into the blocks they had been mining.

The assaulter then despatched once again cash to a crypto trade, which Bitquery alleges belongs to Malta-based OKEx.

By August 1 the assaulter discovered their blocks and initiated the chain reorg.

As of press time, not one of the medium of exchange imagination compromised inside the 51% assault have affected from the OKEx trade, in accordance with Bitquery.


The chief in blockchain information, CoinDesk is a media outlet that strives for the best print media requirements and abides by a strict set of editorial insurance policies. CoinDesk is an unbiased working subsidiary of Digital Currency Group, which invests in cryptocurrencies and blockchain startups.

Ethereum Classic Suffers Second 51% Attack In A Week

Your Opinion Matters

Quality - 10


Total Score

Your feedback is important to us to improve our services. We constantly seek feedback to improve and evolve our service, whilst identifying opportunities to assist clients in realising their business objectives.

User Rating: 4.75 ( 4 votes)

Show More

Patricia Bakely

Earn Free Bitcoin Online with

Related Articles

Leave a Reply

Back to top button