Investment firm Goldman Sachs is in talks with BlackRock and Grayscale Investments about playing a key role in their proposed spot bitcoin exchange-traded funds (ETFs), according to CoinDesk, which cited anonymous sources.

If approved, Goldman Sachs could serve as an "authorized participant" to BlackRock and Grayscale Investments' spot bitcoin ETFs, meaning the Wall Street juggernaut would be "permitted to purchase and redeem shares directly from the ETF," the Securities and Exchange Commission explains in a document.

No spot bitcoin ETFs have yet to be approved by the SEC, however, experts suggest the regulator will offer a decision some time between Jan. 8 and Jan. 10. Goldman Sachs's role as an authorized participant would need approval as well.

With traditional financial …