Reputation and Identity Verification Businesses.
Private sector reputation verifiers, and many of them. They could use relationships, mother, father, cousin, uncle, brother, son, high school math teacher, swim coach, etc. to let relationships prove identity. These same verification stations would have to work to keep each other honest by cross checking each other and blowing whistle on bad actors. Enough signatures from these stations and you can get back your own secret information perhaps. The real world reputation verifiers are also a concept behind VOTE I believe, and to your point, it could be coupled with biometrics
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