The current code in legacy/trac#4483 tracks if a client has done a clock check with an authority. But it doesn't do anything with that information at the moment: * making clients wait to contact an authority during bootstrap negates the point of fallback directories (legacy/trac#15775) * making clients continue to contact authorities after bootstrapping risks an inadvertent DoS on the authorities. How important are client clock checks? Do we need to launch a connection every N hours / days simply to check our clock with an authority? Is it worth the extra load on the authorities? Do we trust the clocks on fallback directories?