What does Propy do?

Could you elaborate on the role and operations of Propy in the real estate and cryptocurrency industry? Specifically, how does it facilitate transactions using blockchain technology? What advantages does it offer over traditional real estate transaction methods? Also, how has it been received by the market and industry professionals? Is there any significant case study or partnership that demonstrates the effectiveness of Propy's platform? Lastly, what are some of the challenges that Propy faces and how does it plan to overcome them?