Cryptocurrencies rallied Monday, just a week after they were hit by a major sell-off. As of 4:45 a.m. ET on Monday, bitcoin, ethereum and dogecoin had soared 10%, 7.3% and 11%, respectively, over the past 24 hours, according to data from CoinDesk. Bitcoin climbed to a six-week high of nearly $38,133, while ethereum reached $2,330. Dogecoin was last trading at about 20 cents per coin, giving it a $28.8 billion market cap. The surge came as major tech giants have signaled — or appeared to signal — their support for digital currencies through last week. For one, speculation that "Amazon may be preparing to accept ... (full story)