> to ensure that nobody can have total control of the system, it has to be computationally heavy and expensive in terms of energy required per transaction. To

> to ensure that nobody can have total control of the system, it has to be computationally heavy and expensive in terms of energy required per transaction. To be entirely safe when I go to the grocery store I could drive a tank, but a cost-benefit analysis reveals that I shouldn't. As a thought experiment, what would happen right now if the mining incentive went to 0 and miners subsisted entirely on transaction fees? Would the system still be secure? (It's an important question since that's what will eventually happen with difficulty adjustments)