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Bitcoin wavered on Friday and was heading toward its sharpest weekly drop since September, as worries over regulation and its frothy rally drove a pullback from recent record highs.

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The world’s most popular cryptocurrency fell more than 5 percent to an almost three-week low of $28,800 early in the Asia session, before steadying near $32,000. It has lost 11 percent so far this week, the biggest drop since a 12 percent fall in September.

Traders said a report posted to Twitter by BitMEX Research suggesting that part of a bitcoin may have been spent twice was enough to trigger selling, even if concerns were later resolved.

“You wouldn’t want to rationalize too much into a market that’s as inefficient and immature as bitcoin, but certainly there’s a reversal in momentum,” said Kyle Rodda, an analyst at IG Markets in Melbourne, in the wake of the BitMEX report.

“The herd has probably looked at this and thought it sounded scary and shocking and it’s now the time to sell.”

Bitcoin was trading more than 20 percent below the record high of $42,000 hit two weeks ago, losing ground amid growing concerns that it is one of a number of price bubbles and as cryptocurrencies catch regulators’ attention.

During a US Senate hearing on Tuesday, Janet Yellen, President Joe Biden’s pick to head the US Treasury, expressed concerns that cryptocurrencies could be used to finance illegal activities.

That followed a call last week from European Central Bank President Christine Lagarde for global regulation of bitcoin.

Still, some said the pullback comes with the territory for an asset that is some 700 percent above the 2020 low of $3,850 hit in March.

“It’s a highly volatile piece,” said Michael McCarthy, strategist at brokerage CMC Markets in Sydney. “It made extraordinary gains and it’s doing what bitcoin does and swinging around.”

Second-biggest cryptocurrency ethereum intially slipped to a one-week low on Friday before rising 6 percent late in the Asia session to $1,177.

*Reuters