possibility to sign a page

Pages change. That's what wiki is all about.

But sometimes you would like a manager/teamleader/whatever to be able to sign a specific version of a page.

So, whatever changes happen on a page, one or more specific versions have been signed and thus bare some sort of 'official' status. At least until the next version is signed

Off course not everyone is allowed to sign pages. How to solve this? Be creative!