If you are looking for some good source of material and ideas I can recommend you this publication:

Bitcoin: Questions, Answers, and Analysis of Legal Issues - https://www.fas.org/sgp/crs/misc/R43339.pdf

You can always answer some questions about Bitcoin's legal and regulatory concerns, including its potential for facilitating money laundering, its treatment under federal securities law, and its status in the
regulation of foreign exchange trading.

For those who do not know what Computer science is..... the scientific and practical approach to computation and its applications. That being said, why not go into the inner working of

Bitcoin and the algorithms being used. The most popular question being asked = Can Bitcoin be cracked? You should consider this guy for your research  --> https://www.youtube.com/watch?v=ZloHVKk7DHk

Good luck, and I hope you share the results with us.