It's fairly easy to establish priority for those who care and are willing to search. This could be as simple as posting to a social media account on a server wh

It's fairly easy to establish priority for those who care and are willing to search. This could be as simple as posting to a social media account on a server where you don't have admin access and can't fake the date. Or for your own web page, maybe use webarchive to archive it? But the real thing you're fighting is reader indifference. Many people don't care who said it first, or even whether it's true.