Some days ago: We can confirm that there was a successful 51% attack on Ethereum Classic [1] [1] https://news.ycombinator.com/item?id=18849961 https://news.yc

Some days ago: We can confirm that there was a successful 51% attack on Ethereum Classic [1] [1] https://news.ycombinator.com/item?id=18849961 https://news.ycombinator.com/item?id=18849961 The value of crypto currencies is strongly linked to the available processing power that can be rented for a short amount of time. An attack must never be profitable. So the value of cryptocurrencies cannot grow arbitrarily. Just Bitcoin is quite secure because you cannot easily rent the specialized hardware.