Multinational asset manager Franklin Templeton has submitted an amended S-1 filing for its Franklin Crypto Index ETF, seeking approval to add tokens to the fund over time.

Submitted on Thursday, the filing states that the exchange-traded fund will initially track Bitcoin and Ethereum, with a weighting of 86.31% to BTC ($87,775.00) and 13.69% to ETH ($2,943.19).

It doesn’t commit to adding any other cryptocurrencies, clarifying that “it is uncertain whether any digital assets other than Bitcoin and Ethereum  may in the future be added to the Underlying Index.”

Yet it also doesn’t rule out additions, with the filing taking an almost open-ended approach that suggests more tokens could be added as and when the SEC permits.

As the S-1 form details, “In accordance with the Index Rules, the Underlying Index only includes digital assets that are determined by the Index Provider as being in conformance with prevailing capital markets regulations of major financial jurisdictions including the United States.”

More specifically, Franklin Templeton writes in the application that they would require that “the SEC has approved or permitted an exchange-traded product/fund” for a given token before the firm added it to the Franklin Crypto Index ETF.

The company already offers a Bitcoin ETF, which was one of the first batch of ETFs to gain...