One piece that is for some reason insanely undervalued right now is: a global key sharing system with a baked-in reputation mechanism (you can burn cash to prove to the world you care about your public key). Combined with a human-readable naming system (like https://ens.domains/ or https://www.lens.xyz/), you've got the world's simplest and most useful auth system. SIWE (https://login.xyz/) is going to be the de-facto auth standard for all new web applications at some point in the near-ish future.