Companies applying for spot bitcoin (BTC) exchange-traded funds (ETFs) continue to make changes to their proposals with the U.S. Securities and Exchange Commission (SEC).

This time, it is the financial services company Valkyrie, which submitted an amendment to its application with the regulator.

Valkyrie delivered a registration statement focused on Rule 506. This is a registration exemption from the Securities Act of 1933 that allows companies to offer securities to accredited investors without having to register the securities with the SEC.

In this way, Valkyrie joins six other companies that intend to launch the BTC-based financial instrument that have previously modified their proposals: Bitwise, BlackRock, Fidelity, Grayscale, ARK Invest and VanEck.

Most of the amendments made are of an administrative nature. The only one different, so far, is VanEck's. This states that you will be able to receive bitcoin for your initial funding, when in most cases, companies proposing an ETF provide this capital in fiat currencies (e.g., U.S. dollars).

The Valkyrie ETF, if approved, would trade under the ticker "BRRR" on the Nasdaq exchange, something that has continued to be maintained since its first proposal made last June.

Valkyrie, Invesco, WisdomTree and Bitwise all applied for their respective ETFs after BlackRock, the world's largest investment fund, stoked interest in those financial instruments.