In response to this attack, Ethereum, which is the skeleton that the DAO was built on, had its permanent record reversed by the developers who control it, to reimburse investors who lost Ether in the DAO.
What Are We Going to Do About Bitcoin?

This isn’t an accurate account of what happened; the historical record remains intact. Instead, an ‘irregular state change’ was added to the database, transferring the stolen funds to a withdrawal contract.

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