At scale, you can't pay for coffee on a premium global blockchain. You'll need a peripheral financial ntwrk that settles on that blockchain.
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It's unlikely: all known varieties of Byzantine consensus have negative economies of computational & network resource scaling.
Far more likely scaling on-chain coffee payment compromises security, so that blockchain is neither premium nor seamlessly global.
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Ok. This is an educated guess, an opinion. "can't" and "need" in original tweet don't reflect that.
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