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[–] offender 0 points 1 point (+1|-0) ago 

24 hours is a bit too low, but even just disabling downvoats after 72 hours and nothing else would stop most of the mass-downvoating, while being easy to implement.

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[–] PeaceSeeker [S] ago 

Users could still view a comment history and downvote every three days and pick up all comments made, achieving the same effect.

Voting from histories should be tracked and forbidden. Perhaps exceptions could be made for spambots.