I created this topic specifically, based on my conversation with @Hhampuz (manager) Bounty SantaCoin.io on Alt account involvement in Bounty SantaCoin, such as the title of the topic in particular.
In other words, are you doing the job that the manager was supposed to do before those users should even get a chance to cheat? With maybe 1 or 2 exceptions, everyone who promotes this project through signatures are classic shitspamers, and as I see it they have a bunch of alt accounts.
Maybe you could start a new service, checking all potential participants in signature/bounty campaigns looking for alt accounts?