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What language is the code written in? I'd love to check it out. Have you considered making it available under an open source license?

It's Python code. I will probably open source it once it's a bit more developed.

It might be challenging to weed out competitions which require 'resteem to enter'. If a steemian only enters one of those a week and has a reasonable balance; and if there are many such steemians playing, that'll bump the comp up your list quite heavily.

That's true. It also benefits from being unknown at the moment. Only if I can get it to a point where a significant number of people use it, would we see how robust it is against abuse.