You can anonymise those votes with a hash if your data is structured to need a username for a key value. Use the username as a salt if you must. However the Lemmy API has plenty of metadata to prove a human account that is not a username. Creation date, how many previous comments, if they’re banned from abother connected instanxe. This isn’t about mod tooling or APIs this is about anonymity and privacy.

I vote for no upvote or downvotes, why build a token for a false economy like the upvote at Reddit or the note at Tumblr or the like on Facebook.

Endorphin buttons are not good for anyone.