“Digital identity is one of the most important things to get right, but there is no silver bullet,” Song, who is the CEO, said in an interview. “I believe longer term we’ll see that it’s not a one-size-fits-all approach.” Not least because malicious hackers have an ever-increasing array of tools to get around every system that gets put into place. (The latest is the rise of deep-fakes to mimic people, putting into question how to get around that in, say, a video verification system.)

https://techcrunch.com/2020/01/28/persona-raises-17-5m-for-an-identify-verification-platform-the-goes-beyond-user-ids-and-passwords/