At least 14 digital currencies, including Bitcoin, are now worth more than $1, according to Coinmarketcap.com. Bitcoin prices on the Mt. Gox exchange have climbed back up to $800. Litecoin, which bills itself as the "silver" to Bitcoin's gold and is often accepted by retailers taking Bitcoin, surpassed $1 months ago and now stands at $24. But many lesser-known currencies have broken through the $1 threshold. While Litecoin has the second-largest market cap behind Bitcoin, it is Mastercoin, a cryptocurrency created in October that integrates with Bitcoin's core protocol to make it safer as well as more flexible, ... (full story)