OP_X op codes add a numerical value to the top of the stack.
OP_0 pushes an empty byte array which is interpreted as the numerical value
The rest push a single byte to the top of the stack as a two’s complement integer.
OP_1 pushes a
OP_2 pushes a
2, and so on through
OP_16, which adds a
OP_FALSE is an alias for
OP_TRUE is an alias for