Travel to other countries without a visa? If so, how will the government recognize people from other countries and how do they know if he is clean from illegal activities?

But if you mean that we can pay using bitcoin rather than fiat/credit/debit/other payment, maybe we will see it in the future, which is our benefit because we already have bitcoin. But you can still dream like that and wait for when that happens but I guess it is hard to see yourself traveling to other countries without a visa. Maybe there will be another method to check every citizen from all countries.