Banking watchdog the FCA has issued an official warning about the risks of people offering high returns based on cryptoassets like Bitcoin.
In the past year the price of a Bitcoin rose fivefold - from $8,000 to more then $40,000 - with half that rise coming in December alone.
But such stellar performance has also seen the number of scammers soar - with criminals keen to take advantage of people looking to cash in on the cryptocurrency's rise.
The FCA has now said some firms are offering investments in cryptoassets, or lending or investments linked to cryptoassets, that promise high returns.
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