Has Proven or Has Proved?

Both proved and proven are are acceptable as past participle forms. British and some American style guides recommend proved as the only past participle, admitting of established set phrases like “innocent until proven guilty.” Proven as an adjective preceding a noun is standard usage in both British and American usage.

Has been proved Meaning?

The phrase "it has been proved" means that something has been demonstrated to be true.

What is the past participle of prove?

Proved is both a past participle and also the past tense of prove. I proved you wrong is an example of the word being used in the past tense. When proved is used as the past tense, it could never be exchanged with proven. But proved and proven both function as past participles, so they cause confusion.