The U.S. Securities and Exchange Commission (SEC) this week began reviewing applications from six Bitcoin spot ETFs, including BlackRock’s.

Bitwise’s Bitcoin ETP Trust filing was published in the Federal Register on Tuesday, while BlackRock’s iShares Bitcoin Trust, Fidelity Wise Origin Bitcoin Trust, WisdomTree Bitcoin Trust, VanEck Bitcoin Strategy ETF and Invesco Galaxy Bitcoin ETF are set to be published in the Federal Register on Wednesday.

The ARK 21Shares Bitcoin ETF was published in the Federal Register on May 15, and the SEC extended the review deadline in June.

Valkyrie’s bitcoin spot ETF has not yet been published in the Federal Register, but their application was accepted by the SEC on Monday, a Valkyrie spokesperson said.

While the SEC released the document seeking public consultation last week, the review will not be formally launched until it is published in the Federal Register.

The review period was initially set at 45 days, but can be extended to 240 days. While there is no guarantee that the SEC will approve any application, the crypto community speculates that BlackRock's application is more likely to be approved.