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Good question I have not researched musiccoin enough I would like to hear the answer :)

In many ways. But right now, the difference is that Choon is more stable/less bugs, more artists and content, working playlist incentives, and last, but not least - Choon has a sustainable way of calculating royalties. As opposed to Musicoin, that pays 1 token for every stream. (Which incentivizes quantity and shorter music, over quality - No need to stream a whole track)