According to CoinDesk, tZero-backed startup BOX (Boston Options Exchange) has recently submitted a revised proposal to the U.S. Securities and Exchange Commission (SEC) on February 28 and was filed on Friday. Published in the Federal Register. BOX hopes that the SEC will approve the launch of its newly established subsidiary BSTX (Boston Security Token Exchange). The revised document significantly adjusted the proposal submitted by BSTX last December, increasing the number of market makers required for the initial listing from two to three, and bringing the listing standards closer to those set by the New York Stock Exchange (NYSE) standard. It is reported that BSTX submitted an application in October 2019, hoping to launch a security token trading platform and will store ownership data on the Ethereum blockchain.