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Record price rises and a number of online thefts have put digital currencies such as Bitcoin and Ethereum in the headlines, but what are cryptocurrencies, how do they work and can you actually spend them? Why have values risen so sharply and what are the risks?

If you've bought or sold some, or if you run a business which allows customers to pay in digital currency, Louise Cooper and guests would love to hear your views and experiences on Wednesday.

Joining Louise will be:

Frances Coppola, Coppola Comment finance and economics.
Marc Warne, Founder, Bittylicious.
Matthew Newton, Crypto Researcher, eToro
Professor Alan Woodward, Cybersecurity & cybercrime specialist, University of Surrey.

Call 03700 100 444 from 1pm to 3.30pm on Wednesday 6 December or e-mail moneybox@bbc.co.uk Standard geographic charges from landlines and mobiles apply.

Presenter: Louise Cooper
Producer: Diane Richardson
Editor: Richard Vadon.