The document discusses the potential implications of an exchange-traded fund (ETF) for Bitcoin. It notes that while some like the Winklevoss twins are trying to create a Bitcoin ETF, regulators must approve it and there is skepticism given Bitcoin's volatility. However, private Bitcoin investment trusts already exist, like one from SecondMarket with $65 million in assets. The ultimate impact of a Bitcoin ETF would depend on whether Bitcoin widely catches on as a currency or fades into disuse, and that will be determined more by its use as a currency than by financial speculation.