Top 30 coins comparing coin per usd and predictions based on Eth/Btc trend. It appears for the past 2 times when Eth/Btc ratio trend change to positive that the majority of the top 30 altcoins increase in value for about 4 weeks. Btc/Usd graph is a light blue area representing water. So if you bought and held Btc during the whole time you would be at the surface of the water. So you could compare whether or not you would have been better holding Btc or an altcoin depending if you were above or underwater.