Yeah, it is derived from the last 7 characters of the post UUID:
https://dev-null.sh/@uakihir0/commits/01a15385-f222-72bb-b636-82858ba932bc
/dev/nullAkihiro Urushihara (@uakihir0) on /dev/null: “Wait, there's a hash value attached to this post!”Wait, there's a hash value attached to this post!