Added code and readme file

main.py

@@ -0,0 +1,51 @@
+# imports
+from hashlib import sha256
+from random import randint
+
+# Constants
+MAX_NONCE = 1000000     # Limit for the simulation
+DIFFICULTY = 3          # How many lead zeros has the hash
+
+def random_with_N_digits(n):
+    """Generate a random string with n chars."""
+    range_start = 10 ** (n - 1)
+    range_end = (10 ** n) - 1
+    return randint(range_start, range_end)
+
+def generate_transactions(count=3):
+    """Create the list of transactions"""
+    transactions = []
+    for _ in range(count):
+        sender = random_with_N_digits(5)
+        receiver = random_with_N_digits(5)
+        bitcoins = random_with_N_digits(2)
+        transactions.append(f"{sender}->{receiver}->{bitcoins}")
+    return "; ".join(transactions)
+
+def SHA256(text):
+    """Creates a SHA256-Hash for the text."""
+    return sha256(text.encode("ascii")).hexdigest()
+
+def mine(block_number, transactions, previous_hash, prefix_zeros):
+    """Simulates the mining of a block."""
+    prefix_str = '0' * prefix_zeros
+    for nonce in range(MAX_NONCE):
+        text = f"{block_number}{transactions}{previous_hash}{nonce}"
+        new_hash = SHA256(text)
+        if new_hash.startswith(prefix_str):
+            print(f"Block found! Nonce: {nonce}, Hash: {new_hash}")
+            return new_hash
+    raise RuntimeError(f"Mining not succesful after {MAX_NONCE} tries.")
+
+if __name__ == '__main__':
+    block_number = 1
+    previous_hash = "0" * 64  # Star Value for the first block
+    num_blocks_to_mine = 10
+
+    for _ in range(num_blocks_to_mine):
+        transactions = generate_transactions()
+        print(f"Mining Block {block_number} with transactions: {transactions}")
+        new_hash = mine(block_number, transactions, previous_hash, DIFFICULTY)
+        previous_hash = new_hash  # Hash wird zum vorherigen Hash für den nächsten Block
+        block_number += 1
+        print(f"New Hash: {new_hash}\n")