> Without electricity, Bitcoin would collapse. I'm curious about this: What portion of the electricity used for mining is needed to prevent the collapse of bit

> Without electricity, Bitcoin would collapse. I'm curious about this: What portion of the electricity used for mining is needed to prevent the collapse of bitcoin? My understanding is that the answer looks something like "however much is required to make a 51% attack impractical." If that's right, how should we go about estimating it? Should we understand "practical" to mean "profitable", or should we be thinking more about unprofitable, terroristical attacks?