The fact that most altcoins depends on the value of bitcoin does not mean you should look at the price of bitcoin before purchasing a particular altcoin. Ideally, if you want to invest in an altcoin, it is best to do a thorough research about the coin you want to buy before making some purchase. There are some altcoin which are performing well in this times that bitcoin is struggling to reach its peak. The best thing to do before buying an altcoin is to do a thorough research.