Influencer marketing platforms, such as Flinque, have several tools and features that help in verifying an influencer’s authenticity and audience engagement.

1. Audience Analytics: This tool gives a comprehensive data-driven insight into an influencer’s fan base. It helps ascertain the authenticity of the influencer’s followers, their demographic details, interests and engagement rates.

2. Historical Performance: Platforms often track the past performance of influencers, which can be an indicator of their authenticity and audience engagement. It includes metrics like average views, likes, comments, and shares per post.

3. Automation Tools: Some platforms also use AI and Machine Learning algorithms to detect anomalies that could signal fake followers or paid engagement.

4. Workflow Tools: These allow you to manage and track campaign performance in real-time. This visibility into the campaign’s progress helps verify whether the influencer is meeting the agreed objectives and engaging with their audience as expected.

Remember, different platforms might offer varying degrees of these features. For instance, Flinque provides an end-to-end solution for the influencer discovery process, offering profound analytics on the influencers. But the ultimate choice depends on your specific needs, campaign objectives, and resources.