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By Nate Raymond NEW YORK (Reuters) – The U.S. government said on Monday it plans to auction over 2,700 bitcoins that were forfeited during several cases, several of which stemmed from investigations of the online black market known as Silk Road. The U.S. Marshals Service said that the online auction would be held on Aug. 22, and that potential bidders must register by Aug. 18.

By Rory Carroll NORTH LAS VEGAS, Nev. (Reuters) – A car-sized sled powered by electromagnets rocketed to more than 100 miles (160 kph) an hour through the Nevada desert on Wednesday in what the Los Angeles company developing the technology said was the first successful test of a futurist transit system called hyperloop. Hyperloop One is among several companies competing to bring to life a technical vision by Elon Musk, the founder of rocket maker SpaceX and electric car company Tesla Motors, who suggested sending pods holding passengers and cargo inside giant vacuum tubes between Los Angeles and San Francisco.

By Matt Spetalnick and Michael Martina WASHINGTON (Reuters) – President Barack Obama announced on Friday that he had reached a “common understanding” with Chinese President Xi Jinping on curbing economic cyber espionage, but threatened to impose U.S. sanctions on Chinese hackers who persist with cyber crimes. The two leaders also unveiled a deal to build on a landmark emissions agreement struck last year, outlining new steps they will take to deliver on pledges they made then to slash their greenhouse gas emissions. Speaking after White House talks during Xi's first U.S. state visit, Obama quickly homed in on the thorniest dispute between the world's two biggest economies – growing U.S. complaints about Chinese hacking of government and corporate databases, and the suspicion in Washington that Beijing is sometimes behind it.

By Dan Levine SAN FRANCISCO (Reuters) – Uber drivers are entitled to class action status in litigation over whether they are independent contractors or employees, a U.S. judge ruled on Tuesday, in a case that could have wide implications for the sharing economy. Three drivers sued Uber in a federal court in San Francisco, contending they are employees and entitled to reimbursement for expenses, including gas and vehicle maintenance. In the ruling, U.S. District Judge Edward Chen in San Francisco said drivers could sue as a group on the question of whether they are employees or contractors, and over their demand for payment of tips that were not passed on to them.

The White House is considering applying sanctions against companies and individuals in China it believes have benefited from Chinese hacking of U.S. trade secrets, the Washington Post reported on Sunday. The newspaper, citing several unidentified Obama administration officials, said a final determination on whether to issue the sanctions was expected soon, possibly as early as the next two weeks. Suspicions that Chinese hackers were behind a series of data breaches in the United States have been an irritant in relations between the world's two largest economies as President Xi Jinping prepares to make his first visit to the United States next month.

The United Nations said it expects member states to respect its right to privacy and is assessing how to respond to a report that telecommunications company AT&T Inc helped the U.S. National Security Agency spy on the world body's communications. The company gave technical assistance to the NSA in carrying out a secret court order allowing wiretapping of all Internet communications at the headquarters of the United Nations, an AT&T customer, the New York Times reported on Saturday. The New York Times cited newly disclosed NSA documents that date from 2003 to 2013 and were provided by fugitive former NSA contractor Edward Snowden.

By Yasmeen Abutaleb SAN FRANCISCO (Reuters) – Brazil's President Dilma Rousseff capped off her U.S. tour on Wednesday with a visit to Silicon Valley, where she met with top technology executives and took a ride in Google Inc's self-driving car. Rousseff used her visit to strengthen ties with U.S. technology companies after visiting Washington, D.C. and New York City earlier in the week. During her visit, Google announced it would inaugurate a new engineering space in Belo Horizonte in November that will more than double the number of engineers working in Brazil on some of the company's core products.

By Richard Cowan WASHINGTON (Reuters) – Top U.S. tech companies are warning the Obama administration against imposing new policies that the companies say would weaken increasingly sophisticated encryption systems designed to protect consumers' privacy. In a strongly worded letter to President Barack Obama on Monday, two industry associations representing major software and hardware companies said, “We are opposed to any policy actions or measures that would undermine encryption as an available and effective tool.” The Information Technology Industry Council and the Software and Information Industry Association, representing tech giants, including Apple Inc, Google Inc, Facebook Inc, IBM and Microsoft Corp, fired the latest salvo in what could be a long fight over government access into smart phones and other digital devices.

By Andrea Shalal WASHINGTON (Reuters) – A massive breach of U.S. federal computer networks disclosed this week is the latest in a flood of attacks by suspected Chinese hackers aimed at grabbing personal data, industrial secrets and weapons plans from government and private computers. The Obama administration on Thursday disclosed the breach of computer systems at the Office of Personnel Management and said the records of up to 4 million current and former federal employees may have been compromised. U.S. officials have said on condition of anonymity they believe the hackers are based in China, but Washington has not publicly blamed Beijing at a time when tensions are high over Chinese territorial claims in the South China Sea.

By Patricia Zengerle and Warren Strobel WASHINGTON (Reuters) – The legal authority for U.S. spy agencies' collection of Americans' phone records and other data expired at midnight on Sunday after the Senate failed to pass legislation extending their powers. After debate pitting Americans' distrust of intrusive government against fears of terrorist attacks, the Senate voted to advance reform legislation that would replace the bulk phone records program revealed two years ago by former National Security Agency contractor Edward Snowden. Although the Senate did not act in time to keep the program from expiring, the vote was at least a partial victory for Democratic President Barack Obama, who had pushed for the reform measure as a compromise addressing privacy concerns while preserving a tool to help protect the country from attack.