Olivia Moore on Silicon Valley's most valuable data, and the information asymmetry Cosign is built to fix: "The most valuable data in all of Silicon Valley is who has conviction in who, and who can give you a real read on a person for so many decisions. Who do you invest in? Who do you hire? What company do you join?" "There's such information asymmetry right now. In our job investing, every day we are pinging people saying, 'Do you know anyone who worked with this person?' We do it every…