In the two seminar talks I will give a brief overview of current academic research on Fintech by using tools from mathematics and statistics. The topics to be discussed include: (1) Designing stable coins: how to design stable cryptocurrency by using option pricing theory. (2) P2P equity financing: how to design contracts suitable for a P2P equity financing platform with information asymmetry. (3) Data privacy preservation: how to do econometrics based on the encrypted data while still preserving privacy. (4) Crowd wisdom and prediction markets: how to use the collective opinion of a group to make predictions. All the above 4 topics are based on my recent papers.