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Flohmarkt - a Fediverse replacement for Facebook Marketplace
(codeberg.org)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
You can use gpg signatures
That wouldn’t really solve it though. The problem is not a man in the middle attack. It’s someone scamming you. They can do it, then generate another signature, repeat, etc.
Web of trust - did you hear? https://www.gnupg.org/gph/en/manual/x547.html
So you only trade with people in your web of trust? That’s not feasible. People flock to these websites to trade with strangers. You don’t need a middleman to trade with people you already trust.