Are you thinking about scientific research, or popular writing?
For scientific I would have couple ideas like:
  • How to measure privacy on Bitcoin?
  • What are the top time sinks in user journey when using Bitcoin? (i.e. where is most of the time wasted?)
  • Which Bitcoin concepts are the hardest to understand?
  • What are monetary needs of citizens in a specific country (pick one)?
This is obviously just first round, to get to the actual research question, you would have to get more specific.
These are great. My goals are to help others in various areas of Bitcoin from wallets and transactions to nodes and mining. Thanks for your input. :)
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