A modest bitcoin rally to a possible challenge of the $86,000 level quickly reversed during U.S. afternoon trading hours on Wednesday as Federal Reserve Chairman Jerome Powell warned on the effects of President Trump's tariff regime.

"The level of the tariff increases announced so far is significantly larger than anticipated," said Powell in a speech. "The same is likely to be true of the economic effects, which will include higher inflation and slower growth."

In other words, stagflation — a throwback to a sizable portion of the 1970s when the U.S. experienced weak economic activity alongside double-digit inflation.

"We may find ourselves in the challenging scenario in which our dual-mandate goals are in tension," continued Powell.

The price of bitcoin (BTC) fell about 2.5% in the minutes following the Powell remarks, now trading at $83,700, down 1.5% over the past 24 hours.

U.S. stocks, which had been trying to mount a comeback from opening declines, also were hit, the Nasdaq slumping 3.4% to a session low.