Has Confirmed or Is Confirmed?

Neither is correct, because you need an apostrophe in "it's." The difference between "Once it is (it's) confirmed…" and "Once it's (it has) been confirmed…" is negligible in your sentence.

Has confirmed Meaning?

1 prenominal long-established in a habit, way of life, etc. a confirmed bachelor. 2 having received the rite of confirmation.

What is the difference between confirmed and confirmed?

The word conform refers to agree to continuously be consistent with something or to obey or comply with a set of given rules or standards. Confirm on the other hand refers to the action of establishing the truth or making a theory definite or establishing it firmly.