Answer:
so, john hancock is known for this bold ( and the first ) signature on the constitution. however, he is also know for joining the rebel group, "sons of liberty." the sons of liberty was made in 1765 in response to the stamp act. we should know that john hancock was one of the founding members so i would think it was 1765, since he and john adams were very prominent members.
in the screenshot below is the signature of john hancock.
source(s)
https://www.ducksters.com/history/american_revolution/sons_of_liberty.php
https://www.history.com/news/sons-of-liberty-members-causes
