The ruling by U.S. Magistrate Judge Jacqueline Scott Corley, calls for Coinbase to provide the tax agency with the name, birth date, address and taxpayer identification number of customers who had the Bitcoin equivalent of $20,000 or more in their accounts in any one year between 2013 and 2015.

According to Coinbase, the order will only affect its highest transacting clients, roughly 1 percent of its total customer base of roughly 6 million account holder. The IRS originally demanded records of all Coinbase customers.

As the price of Bitcoin zooms to its highest ever heights, the cryptocurrency’s most valuable startup is preparing for adulthood.

Coinbase, one of the world’s first Bitcoin brokers, last appraised by investors at $1.6 billion in August, is adding a president and chief operations officer to its ranks. The so-called unicorn startup—industry jargon for private businesses valued at $1 billion or more—has selected Asiff Hirji, a former top executive at Hewlett Packard (HPE, +3.48%) and TD Ameritrade, as its number two ranking executive.

“It’s a huge hire for us,” says Brian Armstrong, CEO and co-founder of Coinbase and honoree on this year’s Fortune 40 Under 40 list. “This is going to give us a ton of leverage to grow our existing businesses.”

Most recently, Hirji had been advising portfolio companies, including Coinbase, for the Silicon Valley venture capital firm Andreessen Horowitz, which led a $25 million fundraising round in the company in 2013. To date, Coinbase has raised a total of $217 million, making it the world’s most well funded cryptocurrency venture.

“We’ve seen some of our highest trading days ever in the last few days,” Hirji says, noting that the volume of activity on Coinbase’s exchanges has increased eight-fold since June. (He declined to reveal exact figures.)