An order was also made for the retrial to be held outside Rotorua, where he is widely known.
Until yesterday's verdict we were unable to state this was a retrial, due to the risk of prejudice.
In a statement sent to The Daily Post Blair continued to protest his innocence.
"I am considering all options for a possible further appeal. I am stunned that a jury could bring back this verdict."
On December 17, 2010, as part of a police undercover operation targeting suspected tinny houses in Rotorua, an undercover officer went to an address in Ian St, Rotorua.
Blair was at the house visiting a friend and answered the door when the officer knocked.
When the officer asked if he had any cannabis Blair went away and came back with four tinnies, one of which the officer bought for $20.
During the trial, Blair maintained it was a case of mistaken identity, saying a man by the name of "Andy" had been the one who sold the cannabis and he knew nothing about it.
However, police inquiries had been unable to establish the identity of that man.
Blair will be sentenced in the Hamilton District Court on March 26.