Your bank statement is available to somebody who's threatening you, because it's available to you. That's the problem with being able to verify your own vote, s

Your bank statement is available to somebody who's threatening you, because it's available to you. That's the problem with being able to verify your own vote, somebody else can force you to show them who you voted for, so they can threaten you to make you vote for who they want. It's the same reason you can't take a photo of your ballot.