Summary # Between 2011 and 2014, Mt. Gox, once the largest Bitcoin exchange, experienced a series of attacks that ultimately led to its downfall. A combination of transaction malleability attacks, poor security practices, and mismanagement resulted in the loss of approximately 850,000 BTC, valued at over $450 million at the time. As a consequence, Mt. Gox filed for bankruptcy, and its CEO, Mark Karpeles, faced legal action.
Attackers # The attacker behind the Mt.
...
Summary # In May 2013, Feathercoin was attacked by a 51% attack that resulted in the loss of millions of dollars. The attack was carried out by an attacker who was able to gain control of more than 51% of the network’s computing power. The attack lasted for several days, during which the attacker was able to reverse transactions that had been completed while they were in control. The attacker was able to reverse transactions and double-spend coins, resulting in a significant loss for Feathercoin users.
...
Summary # In July 2012, BTC-e, a cryptocurrency exchange, experienced a security breach that resulted in the loss of around 4,500 BTC. The hack was enabled by a combination of weak security practices and system vulnerabilities, which allowed the attackers to obtain Liberty Reserve API keys and exploit the deposit algorithm. BTC-e claimed to have compensated affected customers and improved security measures following the attack, resuming normal operations within a few days.
...
Summary # On October 5, 2011, Bitcoin7, a cryptocurrency exchange, suffered a security breach that resulted in the loss of approximately 5,000 BTC. The attack was facilitated by a combination of weak security practices and system vulnerabilities, which allowed the attackers to gain unauthorized access to the exchange’s hot wallet. Bitcoin7 claimed to have compensated affected customers and improved security measures following the attack, resuming normal operations within a few days.
...