Vertcoin had a 51% attack, its coins were spent twice, and 603 blocks were replaced by an attacker's transactions.
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As Vertcoin lead maintainer James Lovejoy claims, there is strong evidence that this attack was carried out using a leased hash rate from Nicehash.
The attack was initially detected by checking the work sent from the servers in the Nicehash formation, which sent work for non-public blocks.
Below is a screenshot of the console outputNicehash mining software showing the performance of data for VTC 1253804, when at that time the height of the public VTC was 1253800.
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As a result, hackers seem to have received a net loss of 0.06 BTC ($ 440) to 0.56 BTC ($ 4,100).
Continued at https://investlb.com/en/vertcoin-snova-podvergsya-atake-51/