crypto currency miner in csharp

main.cs
using System;
using System.Security.Cryptography;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        // Set the difficulty level by specifying the number of leading zeros required
        int difficulty = 3;

        // Create a random seed value for the nonce
        Random rand = new Random();
        int nonce = rand.Next();

        Console.WriteLine("Mining for a block with difficulty {0}...", difficulty);

        // Keep generating hashes until one with the required difficulty is found
        while (true)
        {
            // Concatenate the block header fields into a single string
            string block = String.Format("PreviousHash:{0}Nonce:{1}", GetPreviousHash(), nonce);

            // Compute the SHA-256 hash of the block header
            SHA256 sha256 = SHA256.Create();
            byte[] hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(block));

            // Check if the hash has the required number of leading zeros
            if (IsValidHash(hash, difficulty))
            {
                Console.WriteLine("Block found with hash {0} and nonce {1}", BitConverter.ToString(hash).Replace("-", ""), nonce);
                break;
            }

            nonce++;
        }

        Console.ReadLine();
    }

    static string GetPreviousHash()
    {
        // Get the previous block's hash from the network
        return "0000000000000000000000000000000000000000000000000000000000000000";
    }

    static bool IsValidHash(byte[] hash, int difficulty)
    {
        // Convert the hash to binary and count the number of leading zeros
        string binary = String.Join("", hash.Select(x => Convert.ToString(x, 2).PadLeft(8, '0')));
        int leadingZeros = binary.TakeWhile(c => c == '0').Count();

        // Return true if the number of leading zeros is greater than or equal to the difficulty
        return leadingZeros >= difficulty;
    }
}
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