That’s true, but to be honest there’s already a pretty good verification system on Mastodon, even if you don’t host your own instance.

It’s a generic ActivityPub client.

It works this way because Mastodon and Lemmy both implement ActivityPub.

When you mention a Lemmy community from a Mastodon post, this post is sent to the Lemmy server you mentioned and treated as a new post in the community by Lemmy.

Then, when people reply from their Lemmy client, these comments are also visible to on the OP’s Mastodon server.