What is the difference between be known by and be known to ?Feel free to just provide example sentences.

Be known by means that someone else knows that person to fit a specific description.

I want to be known by the world for my talent at singing.
She is known by her friends to be very trustworthy.

Be known to us to recognize a character trait or frequent behavior in someone or an organization.

That company is known to be generous to its employees.
She is known to attend church regularly.
I have been known to be late to work once in awhile.

The difference is very subtle, and people often use them interchangeably.