I know this seems like a very trivial question and I don't know if there are methods to prove the existence of time. But even if there were, the fact that you can't perceive time as something continuous but as dots doesn't sound strange enough?
This is the thought experiment I imagined:
Imagine a series of points on a 2d graph, the y axis is position and the x axis is time. Suppose that each value in y corresponds to one photo, and each value of x corresponds to one second, that is FPS.
Since we do not see continuous time and we only see points (instants of times where there are very large spaces between the intervals) then we do not know how radically the object changes position (even to infinity), to make this more visible, Imagine you have glasses in which you can adjust your vision between 60 and approximately 0 fps, that means that at less fps your vision will be reduced even more without being able to predict the fluidity of the movement, this means that if you would choose an abysmal fraction of fps like 1/28800 fps that would be something like 1 frame every 8 hours, what you would see would change radically every moment. So if time existed we could not perceive time as something continuous either, even seeing at 60fps or 144fps, even more, you do not know how many frames really exist in a second, and since we assume that time is continuous that figure rises to infinity.
So the only way to see a continuous time would be to see an infinite number of frames per second
Therefore an object could in a certain position at a certain instant of time and radically change its position in a very short interval (what we perceive as very short).
So even if you could prove it exists, how can you trust the coherence of time?
EDIT 1.1: I ask these questions from complete ignorance, I am not versed in science so any correction is more than welcome. I tried to think about it from an ontological point of view.
EDIT 1.2: I would like to add to my questions: how can you ensure that the future exists? If the future has not happened and there are infinite possibilities (indeterminism) then the fact that there is a 4D block is impossible, since that would mean that the future happened and the universe is deterministic.
EDIT 2: When I ask if time is coherent, I mean: how can we be sure that there is something like past and future? I try to summarize by asking: what are the proofs to affirm that time exists? And if this can be proven (I don't know) then how can you trust the coherence in relation to the present? If we can only perceive and live in 3D that means that we cannot live in the past or in the future, by not being able to "feel" time we can only infer that time exists, but we cannot feel it (or can we?). The example of the fps serves to make this question visible, if the time were continuous (using intuition, since it could be discrete but this is less intuitive) we would not be able to notice all the changes, I did not notice that the speed of movement is limited by c, even so, I'm not sure if the fact that we cannot perceive time as something continuous in some way could generate huge distortions that we cannot notice as objects that move faster than light or something like that. Again I'm just speaking from ignorance.