test data

main.py

@@ -0,0 +1,86 @@
+import json
+import os
+import hashlib
+import time
+
+# Constants
+MEMPOOL_DIR = 'mempool'
+OUTPUT_FILE = 'output.txt'
+DIFFICULTY_TARGET = '0000ffff00000000000000000000000000000000000000000000000000000000'
+MAX_NONCE = 2**32  # Maximum nonce value before wrapping around
+
+def read_transaction_file(filename):
+    with open(os.path.join(MEMPOOL_DIR, filename), 'r') as file:
+        return json.load(file)
+
+def is_valid_transaction(transaction):
+    # Basic validation checks
+    required_fields = ['vin', 'vout']
+    for field in required_fields:
+        if field not in transaction:
+            return False
+
+    if not transaction['vin'] or not transaction['vout']:
+        return False
+
+    input_value = sum([vin['prevout']['value'] for vin in transaction['vin']])
+    output_value = sum([vout['value'] for vout in transaction['vout']])
+    if input_value < output_value:
+        return False
+
+    return True
+
+def calculate_transaction_fee(transaction):
+    input_value = sum([vin['prevout']['value'] for vin in transaction['vin']])
+    output_value = sum([vout['value'] for vout in transaction['vout']])
+    return input_value - output_value
+
+def create_coinbase_transaction(block_transactions):
+    return {
+        "txid": "coinbase",
+        "value": 50  # Fixed block reward for example purposes
+    }
+
+def mine_block(transactions, previous_block_hash):
+    # Implementing the proof-of-work algorithm
+    nonce = 0
+    while nonce < MAX_NONCE:
+        block_header = str(previous_block_hash) + str(time.time()) + str(nonce)
+        block_hash = hashlib.sha256(block_header.encode()).hexdigest()
+        if block_hash < DIFFICULTY_TARGET:
+            return block_hash, transactions
+        nonce += 1
+    return None, transactions
+
+def main():
+    print("Starting mining simulation...")
+    transaction_files = os.listdir(MEMPOOL_DIR)
+    transactions = [read_transaction_file(f) for f in transaction_files if f.endswith('.json')]
+
+    print(f"Read {len(transactions)} transactions from the mempool.")
+
+    valid_transactions = [tx for tx in transactions if is_valid_transaction(tx)]
+    print(f"Validated {len(valid_transactions)} transactions.")
+
+    valid_transactions.sort(key=calculate_transaction_fee, reverse=True)
+    print("Sorted transactions by fee in descending order.")
+
+    coinbase_tx = create_coinbase_transaction(valid_transactions)
+    print("Created coinbase transaction.")
+
+    previous_block_hash = '0000000000000000000000000000000000000000000000000000000000000000'
+    block_hash, block_transactions = mine_block([coinbase_tx] + valid_transactions, previous_block_hash)
+
+    if block_hash is not None:
+        print(f"Successfully mined a block with hash: {block_hash}")
+        with open(OUTPUT_FILE, 'w') as file:
+            file.write(block_hash + '\n')
+            file.write(json.dumps(coinbase_tx) + '\n')
+            for tx in block_transactions:
+                if 'txid' in tx and tx['txid'] != "coinbase":
+                    file.write(tx['txid'] + '\n')
+    else:
+        print("Failed to mine a block within the nonce range.")
+
+if __name__ == '__main__':
+    main()

run.sh

@@ -1 +1 @@
-# Update this file to run your own code
+python main.py