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I am not sure it would be practically feasible for a "rollback" in a blockchain based system. Miners would lose a lot of their reward if you suddenly say that

I am not sure it would be practically feasible for a "rollback" in a blockchain based system. Miners would lose a lot of their reward if you suddenly say that this chain is invalid and all data has to be entered again. It would use a lot of computing resources as well.

ballenf 9y ago
Rollback is typically only discussed with regard to private or closed blockchain implementations. Which just highlights the root "why blockchain?" question even further when discussing private implementations.