Bitcoin, the world's biggest cryptocurrency, falls more than 4% to near $60 000
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Bitcoin, the world's biggest and best-known cryptocurrency, fell more than 4 percent on Tuesday as it extended a decline through a week that also included an upgrade to its blockchain.
Bitcoin fell to $60 350 at its lowest for the day, taking losses from a record high of $69 000 struck on November 10, to more than 11 percent.
Ether, the second-biggest cryptocurrency by market value, was down 4.5 percent at $4 355.4o.
Cryptocurrency analysts said there did not seem to be any news driving the declines, and the moves seemed driven by profit taking after the sharp run-up.
"There is a lack of news and this is some pure selling of spot and some additions of short selling. Outside of this, there is no significant news," said Matthew Dibb, the chief operating officer at Singapore-based crypto asset manager Stack Funds.
Bitcoin's value has more than doubled since June, driven by mainstream adoption of cryptocurrencies and, more recently, the launch of futures-based bitcoin exchange-traded funds in the US.
It went through a major upgrade, called Taproot, on Sunday that enables its blockchain to execute more complex transactions, potentially widening the virtual currency's use cases and making it a little more competitive with ethereum for processing smart contracts. Smart contracts are self-executing transactions whose results depend on pre-programmed inputs.