> On a self-hosted instance, how do you prove to people [...] Generally the ActivityPub protocol disseminates a user's actions to a number of other users. On M

> On a self-hosted instance, how do you prove to people [...] Generally the ActivityPub protocol disseminates a user's actions to a number of other users. On Mastodon specifically all users mentioned in a post will receive copies. Activities generated by users on other servers can be double checked against their own servers for validity, I think there's very few things that you can game when you're running your own instance without people being able to verify based on what these other instances have received.