One easy solution is to force key holders to de-anonymize themselves if they want to take any shareholder actions, such as voting. This wouldn't be an issue for 99% of us - just because I own a few TSLA shares doesn't mean I'm ever going to pound my fist on Elon Musk' desk and demand something - But if someone does buy up a large portion of the corporation and tries to use it to vote - they would have to declare "Hi, I am Carl Icahn, I own the following private keys XYZ and I'm demanding that we liquidate our assets and build a giant statue to the sky" or whatever. This prevents the Taliban or Chinese hackers from seizing control of a US corporation.