Interesting idea... What might the legal implications be, do you think? Obviously with most fan fiction it is done for fun not profit. But would a successful coin (based on something like Potter) be seen like merchandise? Genuine question, I have no idea
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It's a question that I thought of as well. You would have to be careful about any trademarks or copyrights that already exist for the coin and rewards but in terms of original content you should be fine. Research would be need though.