The network of ZenCash cryptocurrency was attacked. The initiator of the attack, which captured more than 51% of the hashrate of the network, was able to reorganize the blocks in the blockchain and double spend two large transactions. This is reported by Bitcoinist.
ZenCash cryptocurrency was attacked; one miner was able to take 51% of the network's processing capacity. This allowed the initiator of the attack several times to reorganize the blocks in the blockchain, and the largest modified chain contained 38 blocks. The attacker was able to double spend two large transactions for a total of $ 550,000. Mining-pool operators alerted the ZenCash team about the issues. ZenCash team recommended that all exchanges to increase the number of transaction confirmations.
During the attack, approximately 110 blocks were mined, and its duration was about 4 hours. 1 hour of this attack costs the organizer $ 7,700.
ZenCash is a crypto currency with the Proof-of-Work mechanism of consensus and the Equihash mining algorithm.