To take out Bitcoin you have to destroy all computers in the whole world. A solar flare would mainly affect one side of the planet.
Bitcoin would continue on the other side.
I think it will destroy all electronics even which sides are you on. I found out that solar flare is different from coronal mass ejection. CME is the most dangerous. Because it will change the earth magnetic field unpredictably, making all conductor in earth electricity inductors.
Coronal mass ejection (CME) can cause serious problems for electrical systems here on Earth. During a CME, the fluctuations of the sun's magnetic fields cause a large portion of the surface of the sun to expand rapidly, ejecting billions of tons of particles out into space.
CME will produce a magnetic shockwave that extends billions of miles out into space. If Earth is in the path of that shockwave, our planet's magnetic field will react to the event. It's similar to what happens if you put a weak magnet next to a strong one. The weak magnet's field will align itself to the strong magnet's field.
A magnetic shockwave from the sun could cause the alignment of the Earth's magnetic field to shift unpredictably.The magnetic fluctuations can cause compasses to fail.
And since magnetic fields can induce electricity, any conductor could become an inductor. A powerful CME could induce electricity in large, powerful conductors. That could overload electrical systems and cause massive damage.Solar Flare isn't just an explosion of hot gases. It pushes out waves of light all across the spectrum. That includes light we can't see -- including radiation in the form of X-rays and gamma rays. If high-energy rays were to hit a satellite, they could strip electrons from the metal components, ionizing them. As electrons break free, they could short out the electronics within a satellite.