Paul Johnson used Bitcoin to import illegal drugs into the UK, police say.
Read moreBitcoin
The 75-year-old victim said someone from the firm even rang her to wish her a "happy Christmas".
Read moreThe video-sharing platform says a crackdown on crypto-currency videos and channels was a mistake.
Read moreFrancesca Gillett
BBC News
Like every decade, the past 10 years has seen huge cultural shifts and social trends.
Read moreHow did Ruja Ignatova make $4bn selling her fake cryptocurrency to the world - and where did she go?
Read moreBitcoin slips 8% on Libra concerns

Cryptocurrencies are under pressure today, against the background of hostility towards Facebook's Libra.
Bitcoin fell around 8% to $7,462, its lowest level since June.
Ether and Litecoin have also been hit.
Andrew Picken
BBC Scotland News
Jen McAdam, from Glasgow, was threatened after speaking out about the OneCoin cryptocurrency.
Read moreSzu Ping Chan
Business reporter
Leaders of the G7 group of major world economies issue a warning about digital coins like Libra.
Read moreElliott Gunton's parents were given suspended jail sentences for helping the teenager move his funds.
Read moreThe social media giant faces growing opposition to its planned cryptocurrency.
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