import binascii

def audit_op_return(script_hex):
    # 1. Identify the Pattern (6a [Length] [Data])
    # 6a is the opcode for OP_RETURN
    if not script_hex.startswith("6a"):
        print("[ERROR] Not an OP_RETURN output!")
        return

    # 2. Determine data length
    # The second byte is usually the length (PushData)
    try:
        data_len = int(script_hex[2:4], 16)
        data_hex = script_hex[4:]
    except:
        print("[ERROR] Could not parse data length.")
        return

    print(f"--- OP_RETURN Data Audit ---")
    print(f"[*] Raw Script: {script_hex}")
    print(f"[*] Data Size:  {data_len} bytes")

    # 3. Decode the hex data
    try:
        raw_bytes = bytes.fromhex(data_hex)

        # Try to decode as ASCII text
        try:
            ascii_text = raw_bytes.decode('ascii')
            print(f"[STATUS] Decoded ASCII: \"{ascii_text}\"")
        except:
            print("[STATUS] Data is not valid ASCII (likely a binary hash).")

        print(f"[*] Raw Hex Data: {data_hex}")

    except Exception as e:
        print(f"[ERROR] Decoding failed: {e}")

# --- Simulation ---

# Case 1: A text message
# 6a (OP_RETURN) + 12 (18 bytes) + hex("Hello from Bitcoin")
text_script = "6a1248656c6c6f2066726f6d20426974636f696e"
audit_op_return(text_script)

# Case 2: A binary protocol hash (OpenTimestamps)
print("\n--- Next Audit ---")
hash_script = "6a20deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef"
audit_op_return(hash_script)