Perhaps Lobsters? https://lobste.rs/about#invitations https://lobste.rs/about#invitations >The full user tree is public and each user's profile shows who invit

Perhaps Lobsters? https://lobste.rs/about#invitations https://lobste.rs/about#invitations >The full user tree is public and each user's profile shows who invited them. This provides some degree of accountability and helps identify voting rings. For a single community like Lobsters, you don't need the digital signatures part at all. Keybase https://keybase.io/ https://keybase.io/ has a feature to help you aggregate different identities/accounts, though I'm not sure how active it is after their acquisition by Zoom in 2020.