Quick Read

• Cronos erased a $120 million theft by rewinding two hours of blockchain history, proving immutability depends entirely on who controls block production.

• Bitcoin and Ethereum resist deliberate rewinds not from mathematical immunity but because coordinating thousands of independent global miners or validators is practically impossible.

• The incident shows that blockchain finality depends partly on how much coordination a network allows among the people securing it.

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Cronos, the…