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> But blockchains do introduce a technical capability that never existed before: shared, “trustless” access to and control over data.

But that's not a new capability. You can do that with existing tech. At most, it seems to me, what blockchains introduce is convenience, but it comes with a pretty heavy cost in terms of computational resources.



pBFT research existed since the 90s, but I'm not sure if they had good leader election mechanisms or an incentive to participate as a node.


Ok, I’ll bite. What existing tool does this?




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