A former US secret service agent has pleaded guilty to stealing over $800,000 worth of bitcoin during an investigation into online drug marketplace Silk Road. Shaun Bridges, 33, appeared in federal court in San Francisco and admitted to money laundering and obstruction of justice. Silk Road operated for more than two years until it was shut down in October 2013 having generated more than $214m in sales of drugs and other illicit goods using bitcoin, prosecutors said. Ross Ulbricht, Silk Road’s creator, who authorities say used the alias Dread Pirate Roberts, was sentenced to life in prison after a federal...