Basketball NewsRoc Nation Owner Jay Z Attended a Rooftop Party to Celebrate Kyrie Irving SigningJacob StallJuly 8, 2019October 24, 2019 by Jacob StallJuly 8, 2019October 24, 2019 In order to celebrate his official signing, Brooklyn Nets newest member, Kyrie Irving, had a little rooftop party, including Jay Z (his new agent) and