Even if that signature that the OP put up
does look like Trout's, if it doesn't have a reliable MLB holo or come issued from a card company, I wouldn't buy it, IMHO.
I'm sure all of you have seen those lists that show Trout is already among the most counterfeited sigs in baseball today. The fact that his signature is pretty simple, just makes it that much more doubtful.
Plus, if you're going to dish out good money for a Trout, why not buy one that has an MLB hologram on it or one that is a signed chase card? At least that way you're much more assured of its authenticity (although maybe still not 100%).