Nice question! And, the answer to this question is a big no. They will not accept Bitcoin or any other currency that's created and traded by humans. If aliens are as physical as humans then they might use some form of currency for exchange of goods but only if they have as many senses as we humans have. Otherwise, they might not be able to trade like humans.

Other than that, it's still not proven by science and technology, that those beings really exist. They are mostly part of the fiction novels and entertainment serials, and other than that there isn't any good theory regarding their existence. Let's suppose if there are aliens and they are as physical as humans then why should they accept something that isn't useful for them? It's a fact that Bitcoin is very useful for humans but even in planet Earth no other species are interested in Bitcoin other than humans.

Even if the aliens are present someone in the universe we still can't say that they are good at the technology that we humans have. No one can prove that aliens can be as intelligent as humans because the homo sapiens are the most advanced species currently present in the universe. In this date and time it is really hard to prove the existence of aliens even if they are shared in the form of recoded media such as pictures or videos.

In this time the AI generators can generate any kind of Picture with simple prompts, and trust me it can generate very high quality photos of aliens. One of those AI based image generator is named as Midjourney that can create very realistic photos within seconds. You will be amazed with the quality of those generated photos. That's why it's very difficult to prove the existence of aliens in today's time.