is this kind of game also available in notepad lets just say you upload a file rar file to be specific and you will encrypt the file with a password with your choose paper, rock or scissors and you will upload it to a trusted platform that you can't change the date you uploaded it just like here btctalk you will see a dot if post have been edited, alternatively then you will give the link when your opponent stated his pick and he then download the file and decrypt it by using the paper, rock or scissors he/she will know whether in an instant if he wins or not any idea?
I don't think there would be an easy way for the second person to verify and know the result without the first person actually telling him. If I post the password before hand, or if you know what it is, you can easily check and make sure you win. I think the method used by Ryan is probably the easiest yet effective and secure method there is (no need to unzip a file, easy to verify). With PvP not done on a website, you will have to sacrifice speed for it to work.