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Bitcoin approached all-time highs over the weekend, topping $60,000 for the first time in weeks. Elon Musk tweeted cryptically in an apparent reference to the rally, fueling speculation about his plans. The latest rally comes as the cryptocurrency continues to make gains at major, mainstream institutions. See more stories on Insider's business page.Bitcoin surged above $60,000 for the first time since March, approaching record highs...