The pricing function says you can have the resource if you do the work.
Your question/argument says that solipsism is false because of computationally infeasible resources for bitcoin transactions.
That really has nothing to do with the definition of solipsism.
But I could agree with you, given a definition of self, that extended beyond the mind; If world were mind for the the solipsist. Which is contrary to the accepted definition of solipsism as it exists today.
I would file your question as a research question. This site is not "for" research. It is "about" accepted facts in the literature; So you can get a quick answer that is verified. I hope you can appreciate that for what it is. I'm new to this site, and find it hard to distinguish between research and accepted fact for a variety of reasons; most notably the concept of progress.