Dont we know if Jesus performed miracles?

We know Jesus of Nazareth walked the earth, that is widely accepted even by the most secular groups. The question is, did Jesus perform the miracles which helped prove he was the Son of God?

We know he was crucified and we have Roman records of his death sentence. He was persecuted for "blasphemy" and condemned by the pharisees for it. So what did Jesus do to earn him the title of blasphemer? He performed miracles and forgave people for their sins.

Ex: In the book of Mathew, he forgave the paralytic for his sins and the cripple got off the stretcher and walked home. Even the people who witnessed it cried blasphemer.

So we know he existed, we know he got the death sentence and was crucified, and we know why... for performing miracles. Something only the Son of God can do.

(this is only one example of many)