zkSync contracts v9 upgrade announcement

We will start the notice period to upgrade zkSync contracts to a new version today.

Changes

The exact changes in the code of the contracts can be found here (opens new window).

Added

• nonReentrant modifier for all external functions as additional protection from reentrancy attack.
• New method for EIP-712 ChangePubKey authorization.
• A check for non-zero address when changing the governor.

Changed

• WithdrawalPending event parameters changed.
• Withdrawal event parameters changed.
• Use calldata instead of memory for gas cost optimization.
• The visibility of the function authFactsResetTimer changed from internal to public.
• proveBlocks ignores already proven blocks.

Removed

• Withdrawals are no longer finalized in the executeBlocks function