My Innocence my Guilt

My ancestors have said that I am innocent. They have said that I am innocent until proven guilty. How am I to be proven guilty? I do not, according to my ancestors, need to be proven innocent. According to them, I am innocent
So then, the question seems to be, "How is my guilt to be proven?"

To attempt to answer this question I need to establish what I mean by "guilt" and what I mean by "proof." And/or to establish what my ancestors have meant by "guilt" and "proof."
I see that proof and guilt, according to the ways of humanity, have to do with law. So I need also to be clear about the meaning of "law."

To preserve my innocence, I must be clear about what I mean by:
"law,"
"guilt,"
"proof."

I must find others who agree how we are to do: proof, guilt, law.
How is such clarity to be gained?
How is such agreement to be accomplished?
For what am I responsible?
Who are these others on whom I am to depend?
Help.