Getting ecash without an MTB account

Suppose I want to give ecash to somebody who don't have an account with Mark Twain Bank, and I want the receiver of the coins to know that the coins are genuine. I would have two accounts at MTB, one for savings and one for transactions. I want to give away a million bucks, so I deposit that amount in the transactions account. Then I give the account password to the receiver, he withdraws the money, and I change the password so he can't get any more money from me. I trust the receiver not to change my password, but if he does change it, then I can simply ask MTB to change it back, explaining that I lost my password. Would this work? Mike.