Distributed Consensus is hard and expensive. But it's only needed in case of disagreement: to enable exit and enter in a market of otherwise competing fast centralized chains -- using denunciations and timeouts.
The issue is how to unfreeze the dispute assets, especially since double-spending messages can be signed or revealed arbitrarily long after the fact. Malicious actors could retroactively poison large parts of the ledger; and title insurance would not be possible.
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A robust Distributed Consensus allows to declare a specific version of the ledger as Canonical not just against immediately discovered double-spend attempts, but also against future retroactive claims of prior spending.
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