What is this bottom bracket
Looks like this is what's called a "mid bottom bracket". They seem to be common on BMX bikes. They use bearings that press into the frame. I found a video that shows how to remove and install a new one. It seems like the spindle should slide right out from the video but on the bike I was working on it didn't seem like that would have been the case, but I didn't really try to slide it out.