The first is key: crows are acutely aware of human gaze. They watch you, know which direction you are looking, and use this to predict your behavior.
As you are getting to them, don't watch them or the food you've offered. Drop or place a peanut and then walk on like Lot fleeing the doomed city of Sodom, never looking back. This reassures them that it's not a trap and that you don't mean them harm.
Later, when they have become more comfortable with you, you can interact more directly.
@ct_bergstrom cool info! same with ravens?