https://www.cnet.com/news/coinbase-loses-bid-to-keep-bitcoin-customer-records-from-irs/

US Magistrate Judge Jacqueline Scott Corley for the US District Court in San Francisco ruled Wednesday that the exchange must supply the tax agency with the identities of all users in the US who conducted at least one bitcoin transaction equivalent to at least $20,000 between 2012 and 2015. Corley said a "reporting gap" gave the IRS legitimate reason to demand the information.

"That only 800 to 900 taxpayers reported gains related to bitcoin in each of the relevant years and that more than 14,000 Coinbase users have either bought, sold, sent or received at least $20,000 worth of bitcoin in a given year suggests that many Coinbase users may not be reporting their bitcoin gains," Corley wrote in her judgment. "The IRS has a legitimate interest in investigating these taxpayers."