Cases Involving 51% Attacks
Notice: This is an automatically generated list. To add new cases, please see the Process For Adding New Cases. If information appears to be incorrect, please use the Discussion page to suggest changes.
Some dates of older cases are stated to be the 1st of the month. Please update the dates in the corresponding article and use the Discussion page to report the issue.
2024
October 2024
Oct 30th - M2 Exchange Access Control Vulnerability - $13.7m (United Arab Emirates)
2021
August 2021
Aug 3rd - BSV 51% Attack Repelled - $0k (Global)
July 2021
Jul 8th - Bitmart BSV 51% Attack - $Unknown (Cayman Islands)
June 2021
Jun 29th - Haven Protocol Triple Attack - $11.6m (Global)
May 2021
May 17th - CheapETH 51% Attack Demonstration - $0k (Global)
February 2021
Feb 14th - Verge Block Reorganization Attempt - $0k (Global)
January 2021
Jan 19th - Binance Firo (ZCoin) 51% Attack - $4.381m (Global)
Jan 19th - Indodax Firo (ZCoin) 51% Attack - $400k (Global)
2020
November 2020
Nov 7th - Grin Token 51% Attack - $Unknown (Global)
August 2020
Aug 29th - Ethereum Classic Third 51% Attack - $5m (Global)
Aug 5th - Bitfinex/Ethereum Classic Second 51% Attack - $3.2m (Unknown)
July 2020
Jul 31st - OkEx Ethereum Classic 51% Attack - $5.6m (Malta)
Jul 10th - Bitcoin Gold 51% Attempt Foiled - $0k (Global)
January 2020
Jan 1st - Binance/Bitcoin Gold Double Spend Hack - $72k (Malta)
2019
May 2019
May 15th - Bitcoin Cash Two-Block Double Spend - $1.3m (Global)
January 2019
Jan 1st - Gate.io Ethereum Classic 51% Attack - $271k (Cayman Islands)
Jan 1st - Bitrue Ethereum Classic 51% Attack - $14k (Taiwan/Singapore)
2018
December 2018
Dec 2nd - Vertcoin 51% Attack - $100k (Global)
May 2018
May 22nd - Verge Second 51% Attack - $1.75m (Global)
May 15th - Monacoin 51% Attack - $90k (Japan)
May 11th - Binance Bitcoin Gold 51% Attack - $Unknown (Cayman Islands)
May 11th - Bithumb Bitcoin Gold 51% Attack - $Unknown (South Korea)
May 11th - Bitinka Bitcoin Gold 51% Attack - $Unknown (Peru)
May 11th - Bitfinex Bitcoin Gold 51% Attack - $Unknown (Hong Kong)
May 1st - Bittrex Bitcoin Gold Double-Spend - $255k+ (Liechtenstein)
April 2018
Apr 4th - Verge 51% Attack - $1.074m (Global)
Apr 1st - Electroneum 51% Attack - $0k (Global)
2014
July 2014
Jul 13th - MintPal Vericoin Hack/Rollback - $2m (United Kingdom)