Opcode number: 141
Short description: Fail the script unconditionally, does not even need to be executed.
OP_2MUL is a disabled opcode in the Bitcoin scripting system.
OP_2MUL was originally intended for multiplication operations, specifically to multiply the top item on the stack by 2.
Due to concerns about potential vulnerabilities and the desire to simplify the scripting language,
OP_2MUL (along with several other opcodes) was disabled early in bitcoin's development.
OP_2MUL is disabled, any script that contains it will render the transaction invalid regardless of context.