The only broad way to do this is to verify identity documents, usually passports. The industry term is documentary verification. Jumio is one company that has b

The only broad way to do this is to verify identity documents, usually passports. The industry term is documentary verification. Jumio is one company that has been in this business for awhile. If you have checked in for an international flight at a kiosk by scanning your passport, you were verified by Jumio. If you put your passport to a webcam to verify your Airbnb profile, it was Jumio. Here are more details about how documentary verification works, https://blog.cognitohq.com/documentary-and-non-documentary-id-verification https://blog.cognitohq.com/documentary-and-non-documentary-i.... As a disclaimer, my company does NOT offer documentary verification but we do recommend various services to companies that need more than US verifications.