Subject: "File No. SR-NYSEArca-2021-90"

Dear SEC,

I write to you as a GBTC shareholder, in support of the conversion of Grayscale Bitcoin Trust (OTCQX: GBTC) to an ETF. By not approving this conversion, you are not protecting me, the investor - the very person you were appointed to protect.

Last October, you approved futures-backed Bitcoin ETFs, but continue to reject applications for spot Bitcoin ETFs. Given that investors use both vehicles to gain exposure to the same underlying asset, Bitcoin-from which both vehicles derive their prices-we, as investors, should be able to choose if we'd like direct or futures-based exposure to that asset.

Furthermore, the discount to NAV in GBTC has been around 25%, on average, this year. This means that the price of GBTC is less than the price of Bitcoin, the asset itself. Given that GBTC has about $30bn in AUM, existing shareholders like me are experiencing a destruction of value of around $7.5 billion.

GBTC is the world's largest publicly-traded cryptocurrency fund, with hundreds of millions in daily trading volume. It holds approximately 3.4% of all Bitcoins outstanding, and is held by more than 850,000 investors, like me.

I'm writing from [ ADD YOUR STATE HERE ], with gratitude for the opportunity to express my view to you and with the hope and expectation that you will approve this conversion and protect the interest of investors.

Sincerely,