I am using the Jaxx wallet and noticed that the value of my btc shown in dollars or euros is 1.5% less than the value calculated by multiplying (amount of btc) * (value of btc at coinmarketcap com). That is probably because they are following some other feed for prices, but which is it? Couldn't find it on their T&C's or anywhere i looked. And is that diference of 1,5% ..."normal"?