Last year, a media investigation revealed that a Florida-based data broker, Datastream Group, was selling highly sensitive location data that tracked United States military and intelligence personnel overseas. At the time, the origin of that data was unknown.Now, a letter sent to US senator Ron Wyden’s office that was obtained by an international collective of media outlets—including WIRED and 404 Media—reveals that the ultimate source of that data was Eskimi, a little-known Lithuanian ad-tech c...