The U.S. Securities and Exchange Commission (SEC) is temporarily suspending trading of shares in a little-known, self-described crypto exchange and mining firm called Bitcoin Generation (BTGN).

The regulator announced Monday that it was suspending trading until 11:59 P.M. Eastern Daylight Time on May 10, 2019 (or 03:59 UTC May 11) due to concerns that some information BTGN has made public may be inaccurate.

Specifically, the SEC is concerned about a bond that BTGN “purportedly acquired from an entity based in the United Kingdom”; how much BTGN stock is outstanding; promotional activity related to BTGN; and the “accuracy and adequacy…