We will try out the plugin here. For the moment we are interested mostly in workflow enabled by wiki with only a nod to digital signatures.
wikipedia 
github
The original idea and user interaction developed by Clive and Ward as Imagine Wiki Contracts.
Invalid signatures probably valid for prior versions.
Here signed I agree with reservation.
Add the plugin to your wiki.
wiki-plugin-signature
Find pages with signatures.
SEARCH PLUGINS signature
How this works.
multi-parties edit wiki
Imagine, we grant authority to edit, by granting a key (Miller's capabilities method...)
grant authority to edit (svg source).
grant authority to edit