User blog comment:The Mysteryous user/Minecraft and HEROBRINE!/@comment-1455034-20121114143633

Herobrine's existence can be easily discovered if you were to somehow hack the game, and look into its files. Also, you could probable look deeper than that, into the game's messages, as they will probably have something relating to Herobrine. However, through my brief reading through the Minecraft Wiki, Herobrine just seems to take the form of common materials.

I've never played Minecraft, but most everything for a game is stored in its files. Thus, if you hack the files, you can probably find something. If you can't find anything after hacking, then you can be sure that all those Herobrine myths are simply glitches.