According to a recent report from Brazilian newspaper Folha de S. Paulo, however, that win will soon vanish and his triumph over Diaz will be ruled a no-contest.
Nevada State Athletic Commission Executive Director Bob Bennett delivered the news to the Brazilian outlet, and Bloody Elbow's Roy Billington provided the translation: "Yes, it will be ruled a NC (no-contest). I don't know if he will receive the win bonus after this change. That's (the) UFC's call, but a percentage of his purse will be held because of this episode."
For Silva, this news is not entirely unexpected, as it comes on the heels of a serious offense.
His victory parade was halted just days after UFC 183, when a pre-fight drug test came back showing traces of drostanolone and androstane, two anabolic steroids. Yahoo Sports' Kevin Iole first reported the news, and it's been a hot topic in the MMA space since.
Drostanolone and androstane are banned both in and out of competition, so the no-contest will be warranted when it is officially delivered.
This will be the first no-contest on Silva's 40-fight resume. Diaz, on the other hand, is no stranger to this outcome.
A 2007 win over Takanori Gomi was overturned and changed to a no-contest after Diaz tested positive for marijuana after the fight.
Coincidentally, Diaz has tested positive for marijuana two other times in professional competition: once against Carlos Condit in February 2012 and most recently against Silva at UFC 183. However, he lost the fight in these latter two cases, so a no-contest was not administered on his behalf.
It's important to keep in mind that while a no-contest appears imminent for Silva's UFC 183 victory, nothing has been confirmed yet.
As Fox Sports' Damon Martin reported, changing a fight to a no-contest is not an immediate process. NSAC Chairman Francisco Aguilar told Martin the fight cannot be overturned until "a motion is passed by the majority of the commission."
Silva and Diaz will first meet with the NSAC on Feb. 17, and they will likely receive suspensions for their transgressions. Then, in a full disciplinary hearing in March or April, each fighter will receive an opportunity to make a claim for his innocence.
Following this, the commission will decide on their punishments, which could include overturning the fight to a no-contest.
Stay tuned to Bleacher Report as the situation develops.