Some cryptocurrency investors are receiving a new round of letters from the IRS telling them that their federal tax returns don’t match the information received from virtual currency exchanges, a new front in the agency’s burgeoning scrutiny of the industry.

More than 10,000 cryptocurrency investors received open letters from the IRS informing them that they may owe taxes on their digital holdings.

The regulator postponed until October a ruling on whether listing rules can change to allow two cryptocurrency funds to start trading.

Anticipation of a prolonged U.S.-China conflict is mounting, and “it’s possible that a currency war will start as well,” an executive says.

The fintech raised $323 million and is expanding trading of cryptocurrency.

The SEC and FINRA say they’ve held a series of discussions with market participants on how decades-old custody rules might apply to virtual coins.

A Financial Action Task Force note on digital asset oversight is “one of the biggest threats to crypto today,” a research executive said.

“The general feeling is that progress is made every day, little by little,” an executive said of the crypto community’s optimism.

The delay does not “indicate that the commission has reached any conclusions,” the regulator said.

Respondents say they’re concerned about volatility, regulatory uncertainty and a lack of fundamentals to use in determining the right price for bitcoin.