I was looking at the price history of the top 50 coins and they all seem to have very similar price charts. They all seem to have spiked up the first half of this year even if they have been around for several years. My question is what caused all these altcoins to surge up in value so much?
There was increased interest in crypto since Bitcoin was rising for whole 2016. Bitcoin keep rising also in first half of 2017. All altcoins follow Bitcoin. Some more others less.