Coordinate axis with triangulatePoints

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So, I have the projection matrix of the left camera:

and the projection matrix of my right camera:

And when I perform triangulatePoints on the two vectors of corresponding points, I get the collection of points in 3D space. All of the points in 3D space have a negative Z coordinate. I assume that the initial orientation of each camera is directed in the positive Z axis direction.

My assumption was that OpenCV uses Right Hand coordinate system like this:

So, when I positioned my cameras with projection matrices, the complete picture would look like this:

But my experiment leads me to believe that OpenCV uses Left Hand coordinate system:

And that my projection matrices have effectively messed up the left and right concept:

Is everything I've said correct? Is the latter coordinate system really the one that is used by OpenCV?

If I assume that it is, everything seems to work fine. But when I want to visualize things using viz module, their WCoordinateSystem widget is right handed.