Major cryptocurrency exchanges experienced technical issues on Monday as trading volumes soared after billionaire Elon Musk’s Tesla Inc revealed it had purchased $1.5 billion of bitcoin and would soon accept it as a form of payment. The electric vehicle company’s move marked the latest step toward mainstream acceptance of bitcoin, sending it 10% higher on expectations that other companies will soon join asset manager BlackRock Inc and payments companies Square and PayPal in backing the cryptocurrency. San Francisco-based cryptocurrency exchange Kraken said it had temporarily disabled sign-ups after heavy traffic led ... (full story)