In US-based porn production, you need a model release form, a 2257 form, and the ID of the performer. Non-US-based production does not require the 2257 form, but it's smart to have one anyhow. 

We supply a sample form which you can download here:  

You are the producer and you are required to maintain these documents.

Note that this is different for live streaming video, because the law sees our platform as a producer.  In that case you need to upload IDs and releases in order to have someone on live with you. Use the "verification documents" tab on the left hand navigation menu under "model center" to provide this data.