Verified blockchain security incidents with original evidence and historical event dates.
Historical events use their original event dates. Latest event dates first. Severity follows existing archive classifications.
Bitcoinica was hacked twice in 2012. Hackers stole a total of 61,000 BTC, leading to the bankruptcy of Bitcoinica.
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.