Opcode number: 152
Short description: Fail the script unconditionally, does not even need to be executed.
OP_LSHIFT is a disabled opcode in the Bitcoin scripting system.
OP_LSHIFT was intended for bitwise left shift operations, which would shift the bits of the top stack item to the left by a number of positions specified by the second-to-top stack item.
Due to concerns about potential vulnerabilities and the desire to simplify the scripting language,
OP_LSHIFT (along with several other opcodes) was disabled early in bitcoin's development.
OP_LSHIFT is disabled, any script that contains it will render the transaction invalid regardless of context.