Markets
Share this article

Ethereum Classic Attacker Successfully Double-Spends $1.68M in Second Attack: Report

The attacker attempted to double-spend roughly $3.3 million during the second attack.

By Zack Voell
Updated Sep 14, 2021, 9:41 a.m. Published Aug 7, 2020, 1:58 p.m.
Shutterstock (modified with PhotoMosh)
Shutterstock (modified with PhotoMosh)

Ethereum Classic's second 51% attack Thursday resulted in a massive reorganization of 4,236 blocks and successful double-spend of $1.68 million worth of cryptocurrency, according to an investigation by Bitquery.

STORY CONTINUES BELOW
Don't miss another story.Subscribe to the Crypto Daybook Americas Newsletter today. See all newsletters
By signing up, you will receive emails about CoinDesk products and you agree to our terms of use and privacy policy.

  • The attacker tried to double-spend 465,444 ethereum classic (ETC), worth approximately $3.3 million, but only successfully double-spent 238,306 ETC, worth $1.68 million, according to the report.
  • An additional 14,200 ETC were also claimed by the attacker via block rewards during the event.
  • Bitquery found the hashpower required for the attack was probably bought from the same source as for the first attack: Nicehash DaggerHashimoto.
  • Thursday's attack is the second on the Ethereum Classic platform within five days. The first attack occurred on Aug. 1 and was originally thought to be the result of software complications.
  • Ethereum Classic Labs, the core development organization behind Ethereum Classic, announced Friday that it has retained law firm Kobre & Kim to investigate and pursue criminal charges against the perpetrators of both 51% attacks, according to a press release shared with CoinDesk.
Nicehash DaggerHashimoto price and TH/sec during the first and second attack
Nicehash DaggerHashimoto price and TH/sec during the first and second attack

Update (August 7, 16:22 UTC): This article has been updated additional information about Ethereum Classic Labs' response to the attacks.

51% AttacksEthereum ClassicDouble-Spend

Lebih untuk Anda

Protocol Research: GoPlus Security

Oleh CoinDesk Research
14 Nov 2025
Disponsori olehGoPlus
GP Basic Image

Yang perlu diketahui:

  • As of October 2025, GoPlus has generated $4.7M in total revenue across its product lines. The GoPlus App is the primary revenue driver, contributing $2.5M (approx. 53%), followed by the SafeToken Protocol at $1.7M.
  • GoPlus Intelligence's Token Security API averaged 717 million monthly calls year-to-date in 2025 , with a peak of nearly 1 billion calls in February 2025. Total blockchain-level requests, including transaction simulations, averaged an additional 350 million per month.
  • Since its January 2025 launch , the $GPS token has registered over $5B in total spot volume and $10B in derivatives volume in 2025. Monthly spot volume peaked in March 2025 at over $1.1B , while derivatives volume peaked the same month at over $4B.
View Full Report

Lebih untuk Anda

Bitcoin Faces Japan Rate Hike: Debunking The Yen Carry Trade Unwind Alarms, Real Risk Elsewhere

Oleh Omkar Godbole
31 menit yang lalu
japan, flag. (DavidRockDesign/Pixabay/Modified by CoinDesk)

Speculators maintain net bullish positions in the yen, limiting scope for sudden JPY strength and mass carry unwind.

Yang perlu diketahui:

  • Impending BOJ rate hike largely priced in; Japanese bond yields near multi-decade highs.
  • Speculators maintain net bullish positions in the yen, limiting scope for sudden yen strength.
  • BOJ tightening may contribute to sustained upward pressure on global yields, impacting risk sentiment.
Baca cerita lengkap