That's according to Overstock CEO Patrick Byrne, who told Bloomberg that the regulatory agency was not only asking "very broad questions" about the company's plans for tZero and its blockchain subsidiaries in general but was also making detailed inquiries into specific aspects of the token sale, such as how the company ensures ICO contributors are accredited.

Byrne, however, said that the company was "super compliant" and not concerned about the investigation.

"They want to know everything about what we're doing in the world of ICOs and they want to have a conversation," said Byrne. "We're super compliant. We welcome this."

As CCN reported, Overstock disclosed in a March 1 filing that the SEC was probing the tZero ICO, which has raised $115 million from approximately 1,100 accredited investors and is expected to reach $250 million by the end of the sale.