Goldman Sachs has joined a round of funding for internet bank Circle, Purse.io has integrated with Shapeshift.io to allow altcoin holders to make third party purchases from Amazon, SilkRoad trial judge rejects retrial demand and many more top stories from April 30. Goldman Sachs invests US$50 million in Circle Leading the start-up’s series C funding round, Goldman Sachs has joined a group of investors in raising US$50million for Circle. Working alongside IDG Capital Partners, Breyer Capital, General Catalyst Partners, and Accel Partners, the involvement of a high profile name like Goldman Sachs is likely to encourage increased interest and attention …