Totally appropriate. I should say that we don't really want to be in the business of building general crypto apps ourselves, but Keybase identity proofs can make a bunch of things possible. Anything from financial transactions (send a BTC to twitter user X and know it's going to an address they control) to data access (let Keybase/github/twitter user Y access this server/file/whatever). The idea here is that any app can (1) ask Keybase for a user's key and identity proofs, and then (2) verify it all.

The API is not done, btw. If another call is needed, and you're really serious about building it, we will expand the API.