in 2014 , A woman named Dr Ruja ignatova from portugal Started a cryptoCurrency named One Coin. She claimed that One coin will destroy Bitcoin and is the next big thing. In just 3 years she collected an investment of more than 4 billion dollars. However later it was found that One coin was not even a cryptoCurrency. It was just a Ponzi scheme. Dr Ruja vanished in 2017 and no one knows where she is till date.
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