51% Attack On Bitcoin Gold (BTG) sees $18million taken
Bitcoin Gold, a hardfork of Bitcoin was hit with a great numbetr of double spend attacks and this has prompted Bitcoin Gold to increase monitoring as they try to prevent further losses to the BTG holders.
Starting on the 18th of May a miner was able to temporarily take control of 51% of the blockchain which subsequently led to a series of "double spend" attacks resulting in $18million worth of losses for BTG holders over the past week.
Such an attack is usually a temporary ploy to steal alot of money by cheating the exchange.
You can read more here on Bitcoin Golds Forum:
https://forum.bitcoingold.org/t/double-spend-attack-on-exchanges/1362/5
And on the Bitcoin Gold Bitcoin Gold website:
This must have cost him/them close to $18million to execute, an attack of this magnitude and "hi-jacking" the blockchain doesn't come cheap!
Good point!