You can safely publish it here, if you CAN prove your authorship. It's not a problem. The problem is when you can not prove it. F.e. as I said, I often give my student texts of my lectures. And they publish them on forums without my permission. Sometimes I do not even know about it. Then a problem may arise. What do I have? Only the text in my computer, but this does not prove my authorship. I'm talking about this situation, and not when you have your blog somewhere else and can prove that this is your blog.