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ETHW price tanks as Ethereum PoW network is hit by second exploit

By Alara Jordan

Edited by Charlie Mellor

12:41, 20 September 2022

Ethereum token
The price of ETHW has declined by more than 20% as the PoW network is hit by its second exploit in just a matter of days – Photo: Shutterstock

The price of ethpow (ETHW), a hard fork of Ethereum (ETH), that is supported by proof-of-work (PoW) miners has declined by more than 20% as the PoW network was hit by a replay exploit in just a matter of days. 

After several years of anticipation, the long awaited Ethereum update, known as The Merge, took place on 15 September to transform the underlying use of the token’s technology to a proof-of-stake (PoS) consensus mechanism.

The upgrade went through successfully without any reported hiccups and the price of Ethereum rose briefly afterwards, but this was relatively short lived.   

The day after The Merge, the ETHW network suffered a block attack on 16 September, which saw the price of ETHW decline by more than 20%.

Security firm highlights ‘replay attack’

Blockchain security firm BlockSec was the first to inform users of the ‘replay attack’ that took place, stating via Twitter that the cause of the hack on 16 September was linked with the bridge not being able to correctly verify the actual chainID of the cross-chain message. 

The replay exploit confirmed by BlockSec refers to the same transaction that was duplicated on both Ethereum PoW and PoS chains, which allowed hackers attackers to trick the mechanism into releasing tokens from one chain when the transaction had already been executed on another.


383.85 Price
+1.510% 1D Chg, %
Long position overnight fee -0.0753%
Short position overnight fee 0.0069%
Overnight fee time 21:00 (UTC)
Spread 2.50


3,416.83 Price
-0.070% 1D Chg, %
Long position overnight fee -0.0616%
Short position overnight fee 0.0137%
Overnight fee time 21:00 (UTC)
Spread 6.00


0.12 Price
-3.160% 1D Chg, %
Long position overnight fee -0.0753%
Short position overnight fee 0.0069%
Overnight fee time 21:00 (UTC)
Spread 0.0012872


63,859.00 Price
-1.120% 1D Chg, %
Long position overnight fee -0.0616%
Short position overnight fee 0.0137%
Overnight fee time 21:00 (UTC)
Spread 106.00

Further analysis showed that the hacker managed to get away with 200 ETHW, which was transferred via a third party through the Omni bridge of the Gnosis chain, and then replayed the same message on the PoW chain to duplicate the message and net an extra 200 ETHW.

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Crypto market takes a hit

The broader cryptocurrency market has faced a significant decline since its peak in November 2021 as a result of rising global inflation rates and heightened restrictions from regulators.

Bitcoin has witnessed the biggest decline with the cryptocurrency, as of 20 September,  down more than 55% this year alone. The price of the largest cryptocurrency was floating around the $20,000 level as of last week before dipping to a low of $18,800 earlier today.

Ethereum has also witnessed a sharp decline since its performance earlier in 2022, which saw the price of the largest altcoin trading around the $3,000 mark in April. As of 20 September, ETH was trading at around $1,350.

Markets in this article

Ethereum / USD
3416.83 USD
-2.48 -0.070%

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