Don't hire a whitepaper author. If you really have a project, you really have an idea worthy of a whitepaper, write it yourself. I read your post and your language is capable. Get everything put down in a clear way, all your ideas contained. And then you hire someone who becomes more of an editor to clean up your work and make it more user friendly.
Do things the right way. Do things on your own. Sorry but this is the only way to create a successful project.
You can try onlycopyright.com they are helping with whitepaper creation .
Share all information about your project and they will create paper accordingly