Bitcoin tumbles over 20pc after the exposure of this critical flaw
Bitcoin's having a bad morning.
After an update from key exchange MtGox detailed problems with a bug – known as "transaction malleability" – the cryptocurrency is dropping like a stone.
That will mean that withdrawals from the exchange stay halted.
While the Bitcoin community was already aware of the fault, the news has shaken confidence in the alternative currency.
It's now down by nearly 23 per cent from today's highs, to around $540. The volume bars on the right show how transactions have ramped up since the update.
