"Innocent until proven guilty" is simply an admonishment given to juries because many law-and-order types assume that defendants are guilty simply because they are being tried. Legally, a person is simply "not guilty" unless and until they are proven guilty.
"Innocence" is a specific legal term which means that person is not only "not guilty" but further that there is sufficient proof that they did not commit the crime alleged.
"Innocence" is a specific legal term which means that person is not only "not guilty" but further that there is sufficient proof that they did not commit the crime alleged.