Harmony plans to roll back its blockchain to a point before last week’s exploit after discovering that attackers forged more than 3 trillion ONE tokens.

Validators will roll back Shard 0 and Shard 1 to just before the confirmed fraudulent mint, discarding all blocks and transactions after that point.

Harmony said it considered alternatives including token burns, blacklisting wallets and a ONE migration, but concluded that a fixed rollback was the “fairest and most secure” option.

The exploit stemmed from a cross-shard receipt verification flaw that allowed valid receipts to be processed multiple times, enabling attackers to mint ONE without a corresponding debit.

Nearly 2.4T forged ONE, worth almost $3B at pre-attack prices, was moved within two minutes.

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