Caitlyn Jenner is getting put on BLAST by a transgender artist who's getting ready to step in the ring ... and she's calling Caitlyn out to be her next victim.
CJ was challenged by recording artist BraydBunch at a recent face-off event for the Fake Drake celebrity boxing match, which is set to go down in October.
As Brayd faced off against Mike Mazza, she says she hopes her courage will bring others like her into the boxing scene -- even saying she'd love to take Caitlyn down next.
The insults were FLYING -- calling her an oldie whose Olympic status won't mean squat once she's done with her ... she's craving the opportunity to "shut her up," and thinks she can get it done in the ring.
Caitlyn has some experience in the ring, but it might not have been as legit as it looked -- she fought and "beat" bodyguard Mark Behar back in '09 for a charity match ... Mike later claimed the fight was staged for their reality show.
FYI -- the Fake Drake boxing event was supposed to end the night with a big brawl between the imposter himself and Lamar Odom, but the basketball star recently backed out and was replaced by YouTuber M2thaK.
Fake Drake claimed the real Drake paid LO to stay out of it, but sources involved in the deal told us this was not true.