In general (applies to everyone):
Stop thinking of Twitch (or any other service) as your new easy way out to have proof. Once you have your stream going it is very easy to get careless with the quality and availability since it records and keeps videos for you. You're still the one with responsibility for your own proof. It is not the end of the world to not have proof, but there are consequences, and whatever they are, you will be facing them.
In case it was missed,
I would like to express that some of the streaming quality should not become the new standard for video proof, the quality is going worse instead of improving in 2012. (There are clear exceptions and I am sure everyone can differentiate between them. If not, ask for clearance) This includes my own stream. The quality is really lacking and that is why I still take my time to get actual proof up that I feel is sufficient, I will hopefully find a way to stream with great quality such as Taka's where even the timer is very clear to see (though I am not sure if that is good enough either if taken directly from stream. I saw cases of lag/framedrops, but that could be on my side). You guys are allowed to be proud of WRs, show them in full glory.