Self-Validating Empirical Epistemology?

[Ignorant]

That is simply what I'd like to hear someone explain. Consider the bold proposition in the original post. Tell me how we know it's true.

Well if propositions can't be known as true unless they are verifiable, then the proposition in the OP is true because its verified by the evidence.

We can't know a  proposition to be true until we verify it, once we verify it via the evidence then it becomes know as true.

To which evidence (if any) would you point as validation of the OP proposition?