Crypto currency on the market
Bitcoin has taken another step toward the financial mainstream, after a US regulator said it would let two traditional exchanges begin trading in Bitcoin-related financial contracts.
CME Group and CBOE Global Markets exchanges will offer investors Bitcoin futures from later this month.
The move sent the crypto-currency's price up, continuing its volatile week.
Bitcoin hit a record above $11,400 on Wednesday, but then lost 20% of its value in the following 24 hours.
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The announcement from the Commodity Futures Trading Commission (CFTC) that it will allow the futures to be traded was seen as a watershed moment for the currency.
It means that investors will be able to buy and sell "future" contracts in Bitcoins - an agreement to buy the crypto-currency, for example, in three months time at a certain price.
CME Group said trading would be available on its CME Globex electronic trading platform from 18 December.