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Re:Setup Keybase.io, GPG and Git to sign commits on GitHub by daveguy on Monday August 15, 2016 @09:38AM (#12290320)
Edit: I think I found it -- generally referred to as keyservers? Here is a stackexchange post:

http://superuser.com/questions/227991/where-to-upload-pgp-pu...

Can someone please give examples of key-exchange services or server applications? I am getting a bunch of Microsoft exchange results when I try to google it.

Re:Setup Keybase.io, GPG and Git to sign commits on GitHub by snassar on Monday August 15, 2016 @09:51AM (#12290392)
The go-to keyserver software is SKS https://bitbucket.org/skskeyserver/sks-keyserver/wiki/Home and the network of SKS Keyservers can be found at: https://sks-keyservers.net/

Things to know about keyservers such as SKS: There is no way to remove keys or a way to really delete information. Uploading to know server will propagate that information to all SKS servers in the network over time.