Key Takeaways:Grayscale filed a revised S-1 to convert its Dogecoin Trust into a spot ETF, ticker GDOG.The ETF would trade on NYSE Arca, pending SEC approval.NYSE Arca also proposed amendments to the Grayscale Ethereum Trust and its “mini” version to align with new Universal Listing Standards.Grayscale is expanding its ETF ambitions beyond Bitcoin and Ether. The digital asset manager filed an amended S-1 registration statement with the U.S. Securities and Exchange Commission (SEC) to convert its Dogecoin Trust into a spot exchange-traded fund (ETF). If approved, the product would list on NYSE Arca under the ticker GDOG, according to BlockBeats.The move builds on Grayscale’s efforts to bring more crypto assets into regulated markets. NYSE Arca had previously submitted an application to trade the Grayscale Dogecoin Trust, and this revised filing represents a step closer to potential approval.At the same time, NYSE Arca filed proposals to amend the Grayscale Ethereum Trust ETF and its “mini” version. The goal is to align them with the SEC’s recently approved Universal Listing Standards, which are designed to streamline crypto ETF approvals.The filings come amid a surge of interest in altcoin-focused ETFs following the launch of XRP and Dogecoin exchange-traded funds earlier this week. Analysts suggest that the SEC’s adoption of unified listing rules could pave the way for dozens of new crypto ETFs within the next year.