Very good point. The referencing tool integrates seamlessly into the hiring process. So the reference and skills data is collected in real job applications by previous managers. The reference scores highly by providing real examples of their work and the amount of detail.
The upvoting functionality exists within the hiring network. Companies in that pay CV tokens to interact with the worker and see their full profile will be given the option to upvote after interviewing or interacting with them. Hiring companies will be identity checked (Civic or Uport) just as referees will and the network validators will be looking out for this behaviour. There is an infographic on the site to explain how it fits together: https://rblock.co/
Does that make sense?