1964 hack event(s)
Description of the event: On June 8, Feathercoin was attacked by 51%. Before the attack, Feathercoin's total computing power was 0.2GH/s, and during the time of the attack, the computing power doubled 7 times to 1.5GH/s. Thirty-one hours later, an investigation revealed that the attacker took away 580,000 Feathercoin through a double-spending attack on the exchange, at a current price of $63,800.
Amount of loss: $ 63,800 Attack method: 51% attack
Description of the event: Bitcoin exchange Bitfloor suspended operations after the theft of $250,000. The founder Roman Shtylman explained in a post on the Bitcoin Forum that an attacker obtained an unencrypted backup of exchange wallet keys and used these keys to transfer "BitFloor on hand" Most of the coins he held," Shtilman later locked this part of the money at around 24,000 BTC.
Amount of loss: 24,000 BTC Attack method: Private Key Leakage
Description of the event: Bitcoinica was hacked twice in 2012. Hackers stole a total of 61,000 BTC, leading to the bankruptcy of Bitcoinica.
Amount of loss: 61,000 BTC Attack method: Wallet Stolen
Description of the event: The attacker has a lot of computing power to launch a 51% attack. The interesting thing about the Coiledcoin attack is that it is not economically driven, but purely political. Although this move has caused some protests in the community, it shows how vulnerable the SHA-256 cryptocurrency with low hashing power is to attack.
Amount of loss: - Attack method: 51% attack