> I am afraid the basic problems are still not solved with regards to proof of authorship and file integrity These are not basic problems. We're talking about

> I am afraid the basic problems are still not solved with regards to proof of authorship and file integrity These are not basic problems. We're talking about scientific papers, not deeds to a piece of land or something. > how do I know the pdf I’m downloading is what was published? How do you know the paper photo-copy you have of an article is what was published? You don't 100% know, you make a reasonable assumption. The exceptional case of needing integrity verification can have a niche solution.