Fedora has been part of an GPG sks service[1] for a number of years running off of keys.fedoraproject.org. Last year, there were a number of attacks made on the service which due to its 'write-only' nature makes it impossible to clean up [2] [3]. When the attacks came up, and it was clear it was not easily fixable, we moved keys to a proxy only mode. However this mode has not been too stable and caused other issues.