/ˈsɜːtɪfaɪə/ – Noun
Definition: người chứng thực, người xác nhận.
A more thorough explanation: A certifier is a person or entity that verifies or attests to the accuracy or truthfulness of a document, statement, or fact. This individual or organization is responsible for confirming the authenticity and validity of the information being certified.
Example: The certifier confirmed that all documents were authentic and accurate.