Hi. I'm reading an article on Bitcoin, a cryptocurrency. There is a sentence in it the meaning of which I still cannot figure out after a lot of searching on Google. For your information: a node here means a computer running a compatible Bitcoin software (a client). I wanted to know, is "that's all it is to have a Bitcoin" the same thing as "that's all you need to have a Bitcoin"? Or, does it mean having a Bitcoin is equivalent to having the mentioned ability? Besides, I'm not very sure of what "all" refers to. Does it refer to the ability to do the mentioned things? What does the whole sentence mean? a. If you have a Bitcoin, it means you have the mentioned ability; b. Only if you have the mentioned ability can you own a Bitcoin. c. As long as you have the mentioned ability, you will own a Bitcoin. Does it mean a or b or c or none of them? Thank you very much.