I do acknowledge the reasons for single blockchain, for sure. I think the reality will be that we will end up with many blockchains, that in my view needs to be interconnected, maybe more interconnected than they are now, ie currency trading at exchanges. For universal usernames, there are other solution that can be implemented and may need to be implements IF we are ok not to be anonymous. Since when we want to stay anonymous, we do not want to have the same username in all services. Maybe blockchain service can be created to manage usernames, like we have in the internet for domain names? Domain names are universal, or at least on our planet Earth, universal. What we may do on Mars, or the Moon, that is to be seen :)
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