Bitcoin (BTC-USD) pulled back from all-time record highs on Thursday afternoon after crossing the key $100,000 milestone Wednesday evening in a stunning rally driven by the belief that President-elect Donald Trump's administration will create a crypto-friendly regulatory environment.

Bitcoin has rallied more than 40% since Trump's presidential win in November, repeatedly coming just shy of the $100,000 milestone. On Thursday the token surpassed $103,000 before pulling back.

Trump took to his social media platform Truth Social early Thursday to cheer the move, telling crypto enthusiasts that they are welcome for the rally that has followed his election win last month.

"CONGRATULATIONS BITCOINERS!!! $100,000!!! YOU'RE WELCOME!!!" Trump wrote. "Together, we will Make America Great Again!"

The token's latest surge came late Wednesday after Trump picked Paul Atkins to chair the Securities and Exchange Commission. Atkins was seen as a crypto-friendly pick for the position.

Trump said Atkins, CEO and founder of Patomak Global Partners and also a former SEC commissioner, “is a proven leader for common sense regulations.”

"He also recognizes that digital assets & other innovations are crucial to Making America Greater than Ever Before," Trump wrote on Truth Social on Wednesday.

New York Sen. Kirsten Gillibrand, a Democrat, told Yahoo Finance on Wednesday that Atkins has the "right experience" to create federal crypto legislation.

“Atkins could very well be a good SEC head,” Gillibrand said (video above).

Investor optimism over crypto-friendly policies grew last month after the SEC announced Chair Gary Gensler will step down on Jan. 20, the president-elect's Inauguration Day.

Gensler led a crackdown on the industry during his time at the SEC. Wall Street had anticipated his replacement would pursue less regulation around crypto.

"The expectation is the new SEC chair is more likely to embrace crypto," Owen Lau, executive director and senior analyst at Oppenheimer, told Yahoo Finance in a recent interview.

"It is huge because it represents a dramatic regime shift from violation of security laws to crypto capital," he added.

Read more: Bitcoin clears another record: Is now the time to invest?

Bitcoin has been a key component of the Trump trade based on Trump's campaign promises, which include prioritizing the creation of a bitcoin national stockpile.

Reports that Trump's transition team is discussing the possibility of a first-ever White House role or "crypto czar" to oversee bitcoin policy have also sent the token higher.