if op in OPCODE_NAMES:
 # Standard opcode (e.g., OP_HASH256, OP_EQUAL)
 decoded.append(OPCODE_NAMES[op])
 elif 0x01 <= op <= 0x4b:
 # Data push (OP_PUSHBYTES_1 to OP_PUSHBYTES_75)
 length = op
 if i + length > len(script_bytes):
 return f"Error decoding script '{hex_script}': Incomplete data push"
 data = script_bytes[i:i + length]
 decoded.append(f"OP_PUSHBYTES_{length} {data.hex()}")
 i += length
 elif op == 0x4c: # OP_PUSHDATA1
 if i + 1 > len(script_bytes):
 return f"Error decoding script '{hex_script}': Incomplete OP_PUSHDATA1"
 length = script_bytes[i]
 i += 1
 if i + length > len(script_bytes):
 return f"Error decoding script '{hex_script}': Incomplete OP_PUSHDATA1 data"
 data = script_bytes[i:i + length]
 decoded.append(f"OP_PUSHDATA1 {data.hex()}")
 i += length
 elif op == 0x4d: # OP_PUSHDATA2
 if i + 2 > len(script_bytes):
 return f"Error decoding script '{hex_script}': Incomplete OP_PUSHDATA2"
 length = int.from_bytes(script_bytes[i:i + 2], "little")
 i += 2
 if i + length > len(script_bytes):
 return f"Error decoding script '{hex_script}': Incomplete OP_PUSHDATA2 data"
 data = script_bytes[i:i + length]
 decoded.append(f"OP_PUSHDATA2 {data.hex()}")
 i += length
 elif op == 0x4e: # OP_PUSHDATA4
 if i + 4 > len(script_bytes):
 return f"Error decoding script '{hex_script}': Incomplete OP_PUSHDATA4"
 length = int.from_bytes(script_bytes[i:i + 4], "little")
 i += 4
 if i + length > len(script_bytes):
 return f"Error decoding script '{hex_script}': Incomplete OP_PUSHDATA4 data"
 data = script_bytes[i:i + length]
 decoded.append(f"OP_PUSHDATA4 {data.hex()}")
 i += length
 else:
 decoded.append(f"UNKNOWN_OP({op})")