Bitcoin extended its rally on Wednesday, breaking above US$13,000 to a record high despite questions about the cryptocurrency-rsquo;s real value and worries about a dangerous bubble.
-ldquo;We are in the throes of a bubble market, and one of the characteristics of a bubble market is that there is no way to know when the bubble will burst-rdquo;
Mick McCarthy, CMC Markets-rsquo; chief market strategist
Bitcoin received a boost after Friday-rsquo;s announcement by the main US derivatives...

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