Please don't assume that most people are happy to go with V1 balances only.
I have 0 Karma on V1.
I have 100 million Karma on v2 and can prove with a screenshot.
For the people that are suggesting relying on less than v2 username proof. Are you suggesting we either simply use v1 balances (100% provable, some people will lose 100% of their Karma) or a lower standard of evidence to prove v2 balances?
I think most people are happy to go with the V1 balances. Using the V2 balances seems like a lot more work for very little extra benefit. I was one of the first people who was able to actually trade on V2 and as socoban said (and I agree) there were very few trades done before the whole thing blew up in everyone's faces.