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Bitcoin hits lowest level since November. As the world's most valuable and popular cryptocurrency, bitcoin fell to as low as $5,790 after it soared more than 1,300 percent during 2017 to end the year at $13,863. Concerns about security and rising regulations have so far kept global investment banking firms and large money managers away from investing in bitcoin and other cryptocurrencies. Most Wall Street analysts liken bitcoin's meteoric rise and steep decline to the dot-com bubble in 2000, or Dutch tulip mania in 17th century. ”We do not believe that these cryptocurrencies will retain their value in the long run in their current incarnation,” it said. Bitcoin on Wednesday dove to $17,000 for the second consecutive day as the major sell-off in the cryptocurrencies market continues. Ethereum, the world’s biggest altcoin, was trading at $1,237 for a massive 14.1% daily decline. Some altcoins saw their price plummet between 25% to 30% in the past 24 hours. …