verification

英[,verɪfɪ'keɪʃ(ə)n] 美[,vɛrɪfɪ'keʃən]

1. additional proof that something that was believed (some fact or hypothesis or theory) is correct;

"fossils provided further confirmation of the evolutionary theory"

2. (law) an affidavit attached to a statement confirming the truth of that statement