Was Jesus guilty or not guilty by the law? There are two answers in this question which contradict each other:

How does the trial of Jesus compare to the judicial standards of the epoch and of the modern times?

The first answer says that Jesus was guilty of what he was charged.  The second claims that Jesus was not guilty at all but intentionally choose not to defend himself.  So was he guilty or not?
Consider this.

A man walks into a court room and long story short, the judge convicts the man of murder in the first degree. However, the man did not commit the crime. Therefore, he is falsely accused, and falsely convicted. Nevertheless, he was convicted, and he was sentenced to death.

Was Jesus guilty of blasphemy? According to the Sanhedrin, yes. Was Jesus falsely accused and falsely convicted? Yes. God (that is, Jesus) cannot be rightly convicted of blasphemy.

It's a matter of perspective. The Sanhedrin convicted Jesus of blasphemy because they did not believe he was God, just as the judge did not believe the man was innocent. Essentially, it's unjust judgment on the part of the judges. However, Jesus was God, and therefore, he was falsely accused and falsely convicted.