What is the GFI Goldfinch protocol?

Could you elaborate on the GFI Goldfinch protocol? I'm curious to understand its core functionalities and how it operates within the cryptocurrency and finance landscape. Specifically, I'm interested in knowing how it enables borrowers to access loans without collateral and how it assures lenders of their investment safety. What kind of innovative technology or framework does it utilize to achieve these objectives? Furthermore, what are some of the challenges the GFI Goldfinch protocol aims to address, and how does it differ from other similar platforms? I'd appreciate a concise yet comprehensive overview of the protocol's workings and its significance in the field.