Function opcodeNot

txscript/opcode.go:1497–1509

opcodeNot treats the top item on the data stack as an integer and replaces it with its "inverted" value (0 becomes 1, non-zero becomes 0). NOTE: While it would probably make more sense to treat the top item as a boolean, and push the opposite, which is really what the intention of this opcode is, i

(op *opcode, data []byte, vm *Engine)

// Stack transformation (x2!=0): [... x1 1] -> [... x1 0]
// Stack transformation (x2!=0): [... x1 17] -> [... x1 0]
func opcodeNot(op *opcode, data []byte, vm *Engine) error {
	m, err := vm.dstack.PopInt()
	if err != nil {
		return err
	}

	if m == 0 {
		vm.dstack.PushInt(scriptNum(1))
	} else {
		vm.dstack.PushInt(scriptNum(0))
	}
	return nil
}

// opcode0NotEqual treats the top item on the data stack as an integer and
// replaces it with either a 0 if it is zero, or a 1 if it is not zero.