(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.
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.
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.
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.
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.
(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 of the findings ...
The European Union's banking watchdog on Friday issued a warning over virtual currency trading amid huge swings in the value of Bitcoin, a lack of regulation and money laundering risks.
A British IT worker has launched a frantic search of a landfill site after realising he accidentally threw away a computer drive holding $7.5 million (5.5 million euros) in the online currency bitcoin.