YouTube keeps it a secret, and there is no firm data on when one can receive a verified tick. I have seen a 40 sub channel get the tick, and 5.5M sub CinemaSins doesn't have it. I've heard Freedom! get help the steam roll on the process, but you still have to meet YouTube's ghostly requirements.
It shouldn't be a priority yet anyways, not until you start to get people reuploading your work or imitating your channel.