> If I forward the message or show you a screenshot, then the case that the communication happened is significantly stronger. (Of course screenshots can be doct

> If I forward the message or show you a screenshot, then the case that the communication happened is significantly stronger. (Of course screenshots can be doctored, but that's another problem) How is it another problem? If the method purports to be able to strengthen claims of veracity, but immediately after you demonstrate it to be vulnerable to spoofing, then it offered nothing in the first place. It's exactly the same problem.