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That's fine if you simply want to find the chain with the most proof-of-work behind it and join that herd, but what if that chain violates your conditions for validity - perhaps it has different inflation, less anonymity, or higher transaction costs than the minority fork that you were originally following as "valid."

In POW the onus is on everyone who runs a node or miner to understand the consensus rules they are choosing, and to be on their toes in the event of a fork (hard or soft). I see this as no different from the POS problem described above.

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