> Although oddly, I remembered it being cryptographically sound and describing a way for the individual to have secure private keys to prove they are them (even to themselves) but I can’t find it when I reread the intro. I thought it was some distributed secure escrow with the Polis but I have have dreamt it.

I'm pretty sure I read something like this too. So either we both dreamt it, or we're both mixing from another science fiction story. :D