This is the 1253rd most frequent Korean word.
확인한
"Confirmed" or "checked."
In this sentence, "확인한" is used as the past determiner to indicate an action where the speaker completed checking something, modifying "문서" (document).
나는 그 문서를 확인한 후 서명했다.
I signed after checking the document.
Here, "확인한" serves as a past participle to describe the information that was verified or cross-checked, modifying "정보" (information).
확인한 정보가 정확했어.
The verified information was accurate.
In this context, "확인한" is used in a clause to describe the individual who performed the act of confirmation, modifying "사람" (person).