We've seen it on sites, especially for Internet providers that are in compliance. If parental consent is required, there is an email verification, an age check, and a check-in by creating an adult account alongside a youth account, with teacher and educator accounts alongside youth accounts. They're managed through someone who has been verified to some degree. There is obviously no “perfect” in these processes. That's what we've seen in those who are in compliance with COPPA. Some best practices along those lines would be the route to go ultimately.
On September 25th, 2017. See this statement in context.