you might not want to announce that you’ve been using their trademark as your personal site, especially after the whole asset store unity name brand thingy
I phoned them up back in 2010 to make sure it was okay to make Unity3d.ca live and they said yes. Had they said no, I would have trashed the idea and got a rid of the website.
i hope the person you spoke to still works there and that you remember their name. if you didn’t get something in writing or at least email, it may not hold up anymore.