If Bitcoin succeeds in the way its developers and entrepreneurs hope, it will be the biggest change in technology infrastructure since the mass adoption of the Internet more than 20 years ago. But will ordinary users be open or resistant to that kind of change? Lee Rainie of the Pew Research Centre studies public attitudes to technology and has been responsible for more than 650 reports based on Pew surveys of people's online and Internet usage. So how does he see the prospects for Bitcoin and blockchain entering the mainstream? "We live in an environment where people's trust in each other and in institutions is declining, particularly in the developed world," Rainie says, "and so blockchain has been held out as a really interesting alternative way to rebuild trust, using technology as the centrepiece of mediating interactions between people …Some of the most interesting applications of blockchain are not about cryptocurrency, they're about trusted systems of...