Nexo, a digital asset management platform, has filed an amended Form S-1 registration statement with the U.S. Securities and Exchange Commission (SEC) for an exchange-traded fund (ETF) that combines exposure to Bitcoin spot and carbon emissions futures. The filing comes after the SEC approved the ETF's Form 19b-4, a request for a staff review, in December. The ETF is expected to track an index of the spot price of Bitcoin and a carbon emissions futures contract. Nate Geraci, CEO of ETF Store, said in a statement that the filing is a "significant step forward" for the Bitcoin spot ETF market. "This is the first time a company has filed for a Bitcoin spot ETF that also includes exposure to carbon emissions futures," he said. The filing is the latest in a series of moves by Nexo to expand its offerings in the digital asset space. In recent months, the company has launched a number of new products and services, including a cryptocurrency exchange, a lending platform, and a custody service.