The operators of OneCoin, Konstantin Ignatov and Ruja Ignatova, are at the heart of a new lawsuit which alleges the brother and sister duo ran a multimillion-dollar Ponzi scheme designed to dupe cryptocurrency investors. The lawsuit (.PDF), filed this week by law agency Silver Miller on behalf of investor Christine Grablis with the US Southern District Court of New York, aims to push a class-action case forward against OneCoin.

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