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Sure, digital cash is the future. We have digital clock, digital compass, why not digital cash right?
I’m 100 percent agree with you on that. But I’m not which crypto currency will be the bigest in upcoming years, but in my opinion Ethereum will.

This is why you diversify at this point. This is my plan. Pick the ones you see most potential in and do the research. ETH is certainly a top contender in my opinion.