Hello
As soon as I’d delete master bone all the keyframes will disappear.
But master bone is giving coordinates to body bones its related to, so I’m guessing, can I bake somehow my IK animation to a rig to export my work without a bunch of master bones
Go to pose mode, then click on the pose menu, then select animation, then click on “Bake Action…”.
Set the end frame according to your animation length,
then check “Clear Constraints”,
then check “Visual Keying”,
then set the bake data to “Pose”,
finally, click on ok.
Now it should work 