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I don't know. That's part of the concern that I had. I was assuming I could change the password to my account at steemit and hand over those credentials, but I don't want someone posting in my name. Besides, as you said, there's no guarantee to the buyer I wouldn't be holding on to the master key.

I guess it simply doesn't work to hand over a wallet key, I'd just have to sell off the Steem itself if I wanted to do it that badly.