Last week the Bitcoin Gold (BTG) network was hit with a 51% attack and as a result lost over 70,000 USD in double spends. What happened raised questions about security as this is not the first time the Bitcoin Gold blockchain has suffered such an attack. The previous time that happened was back in May 2018, when another 51% attack resulted in the loss of over 18mln USD. According to some BTG community members there are secret Application-Specific Integrated Circuits (ASICs) mining the BTG network and there are calls for a safer algorithm.
After the attack last week the BTG developers implemented new Proof-of-Work (PoW) algorithms in an attempt to shore up the security of the blockchain.
SourceThis was not the first such attack on BTG and considering its track record it may not be the last.