Jayz open letter

Brooklyn's biggest ego has a new message for all the haters.

In a new track recorded and released in 24 hours, Jay-Z insists he’s cashing out of the Brooklyn Nets — but not abandoning the borough or its arena.

“Would’ve brought the Nets to Brooklyn for free/Except I made millions off it, you f---in’ dweeb,” he rhymes in his new track, “Open Letter,” directed at critics from Havana to Brooklyn’s Barclays Center.

PHOTOS: THE STYLE OF BEYONCE

The message comes on the heels of Jay’s announcement he will sell his 1/15 of 1% share in the Nets so his new sports rep agency, Roc Nation Sports, can pursue NBA clients. League rules bar sports agents from owning NBA teams.

The rapper has already signed Giants receiver Victor Cruz and Yankee star Robinson Cano. But as Jay-Z raps in the track, he remains invested in the arena itself.

“I still own the building, I’m still keeping my seat/Y’all buy that bulls--t/you’d better keep your receipt.”