The idea of faces changing is handled by the idea of regularly (perhaps once a year) taking a new picture of yourself and having it re-attested by witnesses (pe

The idea of faces changing is handled by the idea of regularly (perhaps once a year) taking a new picture of yourself and having it re-attested by witnesses (perhaps ones randomly chosen, within reason, by a third party). Algorithms or human judges can then give a credibility score of whether the person is genuinely ageing over time or reusing a batch of old pictures, for example. As for the issue of prosopagnosia, that's interesting, I hadn't thought of that. I think that faces could be used just as a bootstrap, equivalent to a "forgot my password" process, to enable someone to associate a blockchain-facial identity to a public key generated on a device. (Also, apparently people with one type of the condition, associative prosopagnosia can have the ability to answer "same/different" about two pictures, even if they can't tell you who is in the pictures.) I haven't seen a full threat model or a fleshed out protocol of how all the pieces in the system would interact, but it's good to hear some of the hurdles it would need to overcome, thanks.