signator
/ˈsaɪnɪˌkeɪtər/Definitions
1. noun
A person who signs or subscribes to a document or agreement.
“The signator of the contract was present in the meeting to answer questions.”
2. noun
A person who is responsible for signing or authenticating a document, especially one related to a government or official record.
“The signator of the passport verified the traveler’s identity.”