Gavin did respond and was apparently "surprised" at what had appeared in the guys blog (which supposedly was not the same as the demonstration he was given).

The fact that Gavin "wasn't allowed to keep the signature" from the personal demonstration is rather suspicious though in itself (and Gavin has admitted that it is possible that he was bamboozled).

Perhaps the key question was whether Gavin verified the double hash of the phrase that he had provided to CW (he has not commented about that AFAIA) because if he didn't then he could have been tricked in exactly the same manner (i.e. the hash not actually being correct).