I had a private key which I accidentally pasted on a group instead of pasting it on my notes (yeah it was dumb). Fortunately, I expected someone managed to save it even though I deleted it in an instant so I never used it.
But I tried putting an amount 0.0001 ETH and it was automatically sent to a burn address as a fee.
Is there a way to cancel the sweeper bot? Or a way to encrypt an existing ETH Priv key, with a password like bip38 in bitcoin?