A person familiar with the comments stated that U.S. Securities and Exchange Commission (SEC) officials sent comments to prospective issuers for bitcoin exchange-traded fund (ETFs), just hours after they filed documents outlining fees for the proposed products.

A person said that the issuers must file updated documents by Tuesday. The comments were aimed at minor details rather than major changes in the amended S-1 form, and shouldn’t affect the timeline of a possible approval by regulator. BlackRock, Grayscale, and Fidelity are among the issuers who hope to launch spot Bitcoin ETFs in America. They announced their fees in earlier filings on Monday.

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, a Bloomberg Intelligence analyst who has been tracking bitcoin ETF applications closely, tweeted, that it is “borderline unprecedented” for applicants to receive feedback from the SEC on the same day regarding amended filings.

The comments made on Monday show that SEC officials continue to engage in dialogues and discussions with would-be ETFs issuers. Most of them proposed spot bitcoin ETFs during the summer. The deadline for the agency is Jan. 10, 2020. Ark and 21 shares submitted one of the applications on Wednesday. In recent weeks, a flurry amended filings from issuers based on their discussions with SEC officials have raised hopes that the agency would approve spot bitcoin ETFs for trading in the U.S. This hope was bolstered by the fact that exchanges such as Nasdaq NYSE Arca, Cboe BZX and NYSE Arca filed amended 19b-4 documentation on Friday. Another individual had told CoinDesk in the past week that these documents were meant to match S-1 filings.

Before an ETF may begin trading, the SEC must deem both 19b-4 and S-1 to be effective.

Bitcoin ETF supporters hope that a regulated product will allow traditional financial institutions to gain exposure to the price of the oldest cryptocurrency in existence without having to deal with new financial structures or set up wallets. Since 2013, the SEC has rejected all applications for a bitcoin spot ETF.

The agency hasn’t yet made a public announcement about how it will rule on the most recent applications. However, based on the feedback and amended documents it has provided – as well as the speed at which it is responding – it appears that the dozen applications are likely to be approved for takeoff.

Marc Hochstein is the editor.