Keybase directory signing
keybase.io/docs/command_line/code_signing
What Jamie wrote
This is a very cool new feature. I really like what Keybase.io is working on with encryption and validating identity.
By convention, directory signing stinks. You have to archive, and then, outside of the archive, you can distribute signed statements about the archive. Verification is even more gnarly: you have to hash, unpack, check an external statement, download a key, and verify the key via a web of trust or other source. This is the Keybase alternative.