Proof

With the enemy's sudden appearance, Naruto, the Seventh Hokage and leader of the village, has vanished. Shikamaru, the Hokage's aide, feels this is a grave situation and visits the Uzumaki household with a group of subordinates. Unable to discount the possibility that Kawaki is a spy for the Kara, he is suspicious of Kawaki and decides to place him under house arrest within a barrier for the time being. However, Boruto becomes annoyed with Shikamaru's attitude and lashes out. As that happens, Kawaki senses the chakra bond he has with Naruto through his prosthetic arm!Source: crunchyroll