ZenCash (now Horizen) Suffers a 51% Attack Resulting in Significant Losses

Summary # On June 2, 2018, ZenCash, now known as Horizen (ZEN), fell victim to a 51% attack. During this attack, the perpetrator managed to double-spend ZEN coins by gaining control of a majority of the network’s hashrate. The attack lasted several hours and resulted in an estimated loss of approximately 23,000 ZEN, which was equivalent to about $550,000 at that time. Attackers # The identity of the attacker or attackers who conducted the 51% attack on the ZenCash network remains unknown. ...