I think a big advantage of current SSO systems as opposed to cryptowallet systems is that they usually come with a verified way to contact the user. On the oth

I think a big advantage of current SSO systems as opposed to cryptowallet systems is that they usually come with a verified way to contact the user. On the other hand, cryptowallet based sign in systems generally don't give you a verified way to contact the user, but they do allow you to see if the user has put money behind this identity. That could be an interesting way to reduce sybil attacks. Having an email address does not mean much in terms of level of buy in to a particular identity (and that, much more than 'real names' is key for managing behaviour).