SINGAPORE, Jan 10 Reuters The dollar was steady on Wednesday in cautious trading ahead of U.S. inflation data later this week that could influence the Federal Reserve39;s policy, while bitcoin was volatile after a fake social media post rattled markets.

The U.S. securities regulator said someone briefly accessed its X social media account and posted a fake message saying it had approved exchange traded funds ETFs for bitcoin. The Securities and Exchange Commission SEC said it had not yet approved spot bitcoin ETFs.

Bitcoin surged to a fresh 21month peak of 47,897 after the fake post, before sliding down to below 45,000 within minutes as the SEC deleted and disavowed the information.

The world39;s biggest cryptocurrency was last down 0.37 at 45,953. Anticipation of a positive SEC decision on ETFs, which is likely to draw billions in new investments, has boosted bitcoin prices in the past two months.

The reality is most who have followed the saga have moved on and the green light from the SEC is fully priced, said Chris Weston, head of research at Pepperstone.

Weston said the market was focused on when the various ETFs would start to trade, how many bitcoins would be held by the end of the year and the dollar value of inflows over that time.

In the currency market, the dollar remained on the front foot, with the dollar index , which measures the U.S. currency against six rivals, last at 102.53, after gaining 0.215 on Tuesday.

The index is up 1 this month, after…