authenticity
US /ˌɑː.θenˈtɪs.ə.t̬i/
UK /ˌɑː.θenˈtɪs.ə.t̬i/

1.
the quality of being authentic or genuine
:
•
The museum verified the authenticity of the ancient artifact.
•
Her writing has a strong sense of authenticity.
the quality of being authentic or genuine