Follow the link below, then click on "Find an account" at left and enter your handle. Then you can select from the tabs along the right side of the screen to see lists your on and who you are blocking and being blocked by
I'm pretty sure 99% of the people I've blocked are just me blocking them after they blocked me.
I lied - I recognize two people that have blocked me. One being Molly Knight, the other being the lady that called herself a Bluesky Elder.