Oh hell no. Biometrics on a blockchain are a terrible idea. But web of trust stuff along the same lines as https://github.com/CirclesUBI/whitepaper, figuring out where PGP went wrong and getting it right, yeah.

I'm not really excited about blockchains at all actually. They put you in the wrong sector of the design space that falls out of the CAP theorem. CRDT's and partition tolerance however, I think there's something useful in there.