Is 2 cores still good?

I'm curious, in the world of cryptocurrency mining and finance, where processing power is often a key factor, is having just 2 cores in a processor still considered good enough? With the increasing complexity of blockchain algorithms and the demand for faster transaction speeds, does 2 cores limit the potential for efficient mining or financial analysis? Or are there other factors, such as optimized software and hardware integration, that can compensate for the relatively low core count?