I'm not sure about that.

One thing is the knowledge needed to create it, which, OK, you might be able to obtain today and travel back with it inside your brain. Let's assume you can.

Another hurdle is the computational power used for Bitcoin. All the constants were "just right" for the computational power at the time. I am not sure if you can come up with another set of constants, 50 years in the past.

Also, the network effect. 50 years ago, very few people were online, if any. You need peers to make Bitcoin a reality. Even in 2009 it was very rare that it worked, 50 years ago it might be impossible.