As for me, anything can be a matter even those things that are just existing in our heads. Of course, the scientific definition can be different and really specific which I have to be honest can be a boring stuff to me. matter is not limited to things that we can see and touch. Come to think of it, things invented by men throughout time actually started with ideas in the heads of their inventors. Same thing with Bitcoin.
right, the thing that initially becomes someone's laughing stock and in the end makes people speechless, because they need it too. For those who can think outside the box, of course, will think that madness is a beginning to change the world