My Wordpress Anti-spam methods

I am pretty sure I get exactly 0 automated bot spams. The only spam I get is human spam. I don’t use any form of captcha anywhere. How do I do this? First off, I changed the comment form to not even use recognizable field names. Second, I added dummy fields and if they are filled in the comment is blocked. One uses a similar name to one of the default field names. I still moderate comments and I will edit them if part is spam and another is not. I even renamed the comment post file (Mainly to prevent wordpress updates from overwriting it)

Nofollow is not used in the url box. It did no good anyway so what’s the point? Make a worthwhile comment on my blog and you can have 1 dofollow link. Links within the comment are still nofollow.