Revenge comes at a cost — literally.

Over the past few weeks, South Korean police have unearthed a criminal network that carries out vengeance on customers’ behalf, with bills settled in crypto.

Think of it as an underground version of Craigslist. But instead of getting a gig worker to clean out gutters, customers can hire people to smear human waste on their enemies’ front door for $1,300 worth.

For $325, the criminals will leave leaflets scattered around the victim’s neighbourhood, alleging that the person is a child sex offender if they’re male, or a prostitute if…