Bubble trouble? Bitcoin tops $11,000 after $1,000 surge in 12 hours

LONDON/NEW YORK (Reuters) - Bitcoin zoomed past $11,000 to hit a record high for the sixth day in a row on Wednesday after gaining more than $1,000 in just 12 hours, stoking concerns that a rapidly swelling bubble could be set to burst in spectacular fashion.Bitcoin's rapid ascent has led to countless warnings that it has reached bubble territory."What's happening right now has nothing to do with bitcoin's functionality as a currency – this is pure mania that’s taken hold," said Garr