1 unique IP per 24 per video is considered as a unique view.
No, there is no any protection except IP unique. In theory someone would be able to use proxies and fake the unique views. The feature is not designed for monetization, but it is designed for motivating users to share their videos and earn some tokens, that can later be used on your site for purchasing some premium access.
What you probably need is some tool for purchasing traffic and paying for it, such tools normally have analytics and protection that can be used together to decide about payments. For example if the analytics decides that the quality of some traffic is bad, it should reduce payment rates for this traffic.