I haven't really, I thought they were the same though it depends upon how it is delivered. If your just having a normal and casual conversation I don't think that it will matter but if your writing a formal document or anything related to Bitcoin then that's the time that you should properly address the use of Pascal case. Thank you for that information, I have not known the difference of bitcoin from Bitcoin until today. What I thought about this is when it is just a normal conversation, you can use any of it just make sure that the message will not be changed.