I agree that that could be a proof of life, but in Assange's particular situation, that would be putting a good amount of faith in his operational security with respect to his GPG keys. I try to keep good op-sec, but I'm not sure that my GPG keys would be secure if someone had physical possession of both me and my devices and the motivation to try and get at my keys.
Yes, but more importantly now, the poll was almost a month ago, and they never bothered to do anything about it. This despite the masses of people calling for proof of life on every twitter post they make.
