While anecdotal, their domain knowledge and comment history on the topic/project generally validates their input. But more importantly, in my experience their

While anecdotal, their domain knowledge and comment history on the topic/project generally validates their input. But more importantly, in my experience their HN handle matches their GitHub or Twitter profile that's found in the project, and it's easy to interact with them and explore more of their work (I've never seen a non-matching username or throwaway account claiming authorship before).