The Australian government said it is deciding whether to extradite to the United States an alleged moderator of Silk Road, a website where people buy illegal drugs like heroin and cocaine using digital currency bitcoin. Peter Phillip Nash, 41, from Australia’s Queensland state, and two other men were charged with conspiracy to engage in narcotics trafficking, computer hacking and money laundering in relation to the website in December. On Saturday, a spokeswoman for Australian Attorney-General George Brandis confirmed Nash appeared before a court in Queensland on Friday where he formally waived extradition rights.