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Has Any Major Blockchain Successfully Executed a Rollback Due to a Dispute?

Yes, the Ethereum blockchain executed a controversial hard fork in 2016 following the DAO hack, effectively "rolling back" the chain to recover stolen funds. This created two separate chains: Ethereum (ETH) and Ethereum Classic (ETC).

This was not a standard contract dispute but a catastrophic security event, demonstrating the technical possibility but highlighting the deep ideological divide on immutability.

How Did the Ethereum Community Respond to the DAO Hack?
What Was “The DAO Hack” and What Were Its Consequences for Ethereum?
How Did the Ethereum Hard Fork Specifically Address the Funds Stolen from the DAO?
Differentiate between a ‘Soft Fork’ and a ‘Hard Fork’ in Cryptocurrency