I wonder if it would be possible for 90% of users to come to agreement on assigning the balance of the wealthiest account to themselves. Without proof-of-work,

I wonder if it would be possible for 90% of users to come to agreement on assigning the balance of the wealthiest account to themselves. Without proof-of-work, there'd be no way to prove this has happened, since it would be easy to create a new blockchain copy which just assigns the coins from the wealthiest account to all other accounts.