America’s inaugural Bitcoin Exchange-Traded Fund could launch as early as Oct. 18. ProShares on Friday filed paperwork with the Securities and Exchange Commission for a public listing, though it may not start trading next week. At least three other companies could follow suit. The SEC has yet to formally approve these ETFs, and observers say there’s a good chance the regulatory body never will. Proponents claim this will open up more ways for people to buy and sell cryptocurrency.