Companies looking to launch bitcoin exchange-traded funds crossed a major hurdle this week in getting approval from US regulators in the coming days.

Staff at the U.S. Securities and Exchange Commission told several exchanges and ETF-listing issuers that they must file a final copy of a key document as soon as possible,

according to four people familiar with the matter who spoke on condition of anonymity. Said to do because... the discussion is not announced.

Two people explained that staff did not provide additional feedback on documents requested from several companies in the wake of the latest legal amendments.

Caution surrounds bitcoin amid exchange-traded fund anticipation.

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