This really depends on you. You have to acquire extensive knowledge in regards to Bitcoin so that you can correctly incorporate technical terms.
Would mathematical Cryptography work for you since I don't see it on that list? You could possibly incorporate how the network chooses the right chain into the 'Voting Procedures'.
thanks for your answer! the thing with mathematics is, i am coming from the wrong side, mainly economics and got into mathematics later on, so i think i might miss some skills in math if its gonna be a deep dive in mathematical cryptography, im sure there are a lot of smart real mathematicans working on that. (not saying i wouldnt be up for it!)
But i like the topic of choosing the right chain and connecting it this way, didnt think about that.
can you think of any topics related to "mathematical cryptography"? (something related to random number generating would also fit)
(one of my more economical idea is e.g. doing a math fairness analysis on bitcoin mining/distribution and what fairness properties it fullfills compared to traditional money)