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In our series of letters from African journalists, Kenyan broadcaster Waihiga Mwaura writes about cryptocurrency scams, including one that traded on his name to fleece investors.

I got a call from a doctor I did not know, asking whether I had interviewed a Kenyan billionaire about a new Bitcoin product on some nondescript website.

I sighed with concern because I knew he had fallen victim to a two-year-old online scam which alleged that along with a local