Ownership verification tokens appear to be part of EPIC's DRM scheme, they're basically just a JSON file with a token in it that's downloaded from their API before launching. This fixes launching games such as Just Cause 4.
Since total_seconds() just returns a positive number with the difference we have to make sure we're actually still before the expiry time.
Unfortunately the history from before this commit is lost to time. And that's probably for the best.