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    Which of the following problems did Blockchain solve for cryptocurrencies?
    
    
    
    37. Which of the following problems did Blockchain solve for cryptocurrencies?
    
        - Anonymity
 
        - Double Spending
 
        - Destination of currencies
 
        - None of the above
 
    
    Answer: B) Double Spending
    Explanation:
    Blockchain solved the problem of double-spending for cryptocurrencies using a nonce.