The world's bitcoin traders are getting ready for this week's ETF decision. The world's bitcoin traders are getting ready for this week's decision by the US Securities and Exchange Commission on an exchange-traded fund (ETF) tied to the digital currency. The agency is expected to make its decision by Friday. Specifically, the SEC is considering a proposed rule change by the Bats Global Exchange that would clear the way for it to list the bitcoin ETF sought by investors Tyler and Cameron Winklevoss. In the meantime, traders are preparing for what's to come – a process that, according to some in the market, means gearing up for the expected volatility that might follow, regardless of the SEC's choice.