Hello, So, I was looking for a way to proof a users existence, and have some kind of information that in case of unlawful actions, I can take legal actions to get in touch with him. So in short, I need a way which allows me to get all his personal information etc. if something goes wrong. This feature is needed to make it for users safe, since they are going to meet strangers. I already found an OTP Verification: - https://wordpress.org/plugins/miniorange-otp-verification/ However this one is a paid feature, and my project is nothing commercial or profit related. So I was wondering if there are alternatives. It doesnt have to be that strong as an OTP Verification via SMS, but if there are other ways, I would love to hear about them.