Yeah that happened to me too and I also wondered about that, but I think in this case the seller could easily prove he transferred the domain by showing screenshots of the buyer providing him the account/username details (via email for example) and it's easy to verify against the registrar that the transfer indeed took place.
Either way I'm probably not the best person to take advice from on security measures, I mostly rely on my "instinct". If the seller seems like an honest person and all the dd checks come up good (and I always do an extensive research and due diligence if I have any reason to doubt), I would just send a $x,xxx payment through paypal, or even wire transfer simply based on a pm or email. I've done it many times and so far no problems. Maybe I was just lucky though, but I like to believe I have a good grasp on people online

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