He called them "dubious".
Russian financial authorities initially treated any sort of money issued by non-state approved institutions as illegal, saying they could be used to launder money.
Later the authorities accepted the globally booming market of crypto-currencies but want to either control the turnover or to limit access to the market
"We cannot stand apart. We cannot give direct and easy access to such dubious instruments for retail (investors)," Shvetsov said, referring to households.
Speaking at a conference on financial market derivatives, Shvetsov said the central bank sees rising interest in crypto-currencies because of high returns from buying into such instruments.
He warned, however, that crypto-currencies gradually transform into high-yielding assets from being a mean of payment.
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