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the problem there is you can contribute $0.01 then promote at 5x then re-contribute after every vote. i would create a threahold of $1, $2, $3... pending upvote at each level to counter this

I can't understand what is your mean.

because it is possible that someone will vote more than the pending reward. users could enable promotion with a very small amount of pending reward. after they get an upvote they that brings them to zero they make a 1% upvote and then do promotion again. now they will be perpetually at the top for free.

Now I understand. I will add a filter on pending upvotes. Thanks a lot.

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