:::While it has been said that the ECB report doesn't deny or disprove that Bitcoin is a Ponzi scheme, it doesn't accuse it of being a Ponzi either. The Reuters source is just a headline (as far as it saying anyone even mentions Ponzi and Bitcoin in the same sentence). Headlines are often written by people other than the article's author for the purpose of attracting eyeballs, not communicating relevant information. The other citation (currently used, not in this rewording), the Register one, says that some accuse Bitcoin of being a Ponzi and link to a (from what I can tell) blog which actually only accuses Bitcoin of having one characteristic of a pyramid scheme, not a Ponzi. I just don't see how any of this leads to a Wikipedia worthy mention of people accusing Bitcoin of being a Ponzi scheme. But since it does, considering the quality and substance of the sources which say that people have accused Bitcoin of being a Ponzi scheme, why does the refutation even need a source or its own sentence?