The scale of Bitcoin ETF has expanded to $100 million. If Bitcoin forks, it will support the blockchain with the highest cumulative computational difficulty in 48 hours.

The Bitcoin exchange-traded fund (ETF) of brothers Cameron and Tyler Winklevoss recently submitted new documents to the U.S. Securities and Exchange Commission (SEC), which showed that the issuance scale of this Bitcoin ETF has grown to US$100 million.

The years-in-the-making bitcoin ETF — whose launch has been delayed several times by the SEC — is designed to give investors a way to profit from bitcoin without actually buying the digital currency.

The SEC is expected to make a final ruling on the Winklevoss brothers’ bitcoin ETF on March 11. Speculation has already begun on whether the bitcoin ETF will be approved, as at least one exchange has already offered a prediction market that allows traders to bet on possible outcomes.

The new document, filed on February 8, shows that the scope of the planned issuance has changed.

For example, the size of the Bitcoin ETF has grown from $65 million to $100 million, and the number of shares has increased from 1 million to 10 million. However, the filing shows that the planned offering price per share has been reduced from $65 to just $10.

Notably, the application uses new language to describe the Bitcoin ETF’s position if the Bitcoin network splits due to a hard fork or if there are backward-incompatible changes to Bitcoin’s underlying code .

The document states that if this happens to the Bitcoin network, the ETF's custodian will support " the blockchain with the highest cumulative computing difficulty within 48 hours of the fork ." During this 48-hour period, the creation or redemption of new ETF stock baskets will be suspended.

The document also states:

“If the custodian, in consultation with the sponsors, cannot make a definitive determination as to which Bitcoin network will have the highest cumulative difficulty after 48 hours, or if there is no reasonable criteria to determine which fork to support, then the custodian will support the Bitcoin network that it believes has the best reputation and is most likely to have the support of a large number of miners and users.”

The new filing also includes some other minor updates, such as the companies that will be involved in the Bitcoin ETF as authorized participants. These companies include Convergex Execution Solutions Ltd., KCG Americas Ltd. and Virtu Financial BD Ltd.