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Would you count strong emotional, mental and physical effects to be tangible? Or would it have to be concrete?
I've used all means possible to test, or to try to see what can be done. Neither of them are miracles in the common sense. At most there have been bright lights in the sky as a result of spellcasting a few times. It was on the news at least 3 times because it lit up the sky in large parts of my local area when the energy was released.
Most notable physical changes are widening of my ribcage and growing my jawbone by around 3-4 centimeters, as well as hip and shoulder joint mobility increase. These were boosted by grey alien programs that I specifically asked them to run for improved genetics.
They've also run other "sculpting" programs which have had effect on how my body looks. This doesn't still have a huge effect in itself, a transformation process is needed, powered by your own practice. Same with the muscle growth energy passed on by the reptilian deity Asathiel. It's very effective, up to a point. Visible muscles and improvements beyond what is normally possible, but still not more than what looks normal.
From previous testing I found that conventional magic when done in large scale has a 7% success rate. I think it can be used in the same way here, this figure. If you add grey muscle increase +7%, then Asathiel +7%, then you actually do the work yourself. You still get a 14% increase on top of your natural growth, but if you do nothing, you get nothing.

These are the direct physical things. Large scale social manipulation is a different area, but as a result of what this actually is, it can't be proven to anyone outside the circle engaged in the planning of such magic. It would, to most, sound unrealistic that certain political events were created by a single person burning a sigil. If said, it would sound like boasting. But it can provide personal affirmations for the caster.