Virtual currency "Riecoin" uses computations to help solve math problem
Metal nanoparticles shine with customizable color (w/ video)
(PhysOrg.com) -- Engineers at Harvard have demonstrated a new kind of tunable color filter that uses optical nanoantennas to obtain precise control of color output.
Contactless cards fail to recognise foreign currency
A flaw in Visa's contactless credit cards means they will approve unlimited cash transactions without a PIN when the amount is requested in a foreign currency.
Bitcoin exchange MtGox faced 150,000 attacks per second: report
Bitcoin exchange MtGox faced massive hacker offensives last month, coming under some 150,000 DDoS attacks per second for several days ahead of its spectacular failure, a report said Sunday.
US seizes Bitcoin operator accounts
US authorities seized the accounts of a Bitcoin digital currency exchange operator, claiming it was functioning as an "unlicensed money service business," court documents showed Friday.
Cornell researchers teach Bitcoin attack lesson in selfish mining
Bitcoin faces biggest threat yet: a miner takeover
The Bitcoin digital currency system is in danger of losing its credibility as an independent payment system because of the growing power of a group that runs some of the computers behind it.
US Treasury presents guidelines to virtual money transmitters
Wild, unregulated hacker currency gains following (Update)
With $600 stuffed in one pocket and a smartphone tucked in the other, Patricio Fink recently struck the kind of deal that's feeding the rise of a new kind of money—a virtual currency whose oscillations ...
US says Bitcoin is taxable as property, not a currency
The US tax authority on Tuesday ruled that Bitcoin will be taxed as property, like stocks or real estate, rather than as a basic currency like the dollar.
(Phys.org) —Bitcoin transactions may be anonymous, but they're also completely transparent. This makes stealing easier, but cashing in on the theft without getting caught a lot more difficult. That's one ...
US authorities shut Silk Road website, arrest owner (Update 2)
US authorities said Wednesday that they have busted an online black market for drugs, hitmen, hacker tools and more, arresting the suspected mastermind of a nefarious bazaar called Silk Road.
High-volume Bitcoin exchanges less likely to fail, but more likely breached, says study
Online exchanges that trade hard currency for the rapidly emerging cyber money known as Bitcoin have a 45 percent chance of failing—often taking their customers' money with them.
Bitcoin rises above $1,000
The virtual currency bitcoin Wednesday broke above $1,000 per unit, quintupling in a month, according to Mt. Gox, which manages trading in bitcoin.