OP_LESSTHANOREQUAL compares the top two items on the stack, checking if the second-to-top item is less than or equal to the top item. It pushes 1 (true) if this condition is met, and 0 (false) if not. This opcode is used in scripts where a less-than-or-equal-to comparison is required.
OP_Code Walkthrough
Returns 1 if item-1 is less than or equal to item-2, 0 otherwise
Pop Top Item a
Pop Top Item b
Check if b is less than or equal to a
Push Result