zkLink Halts Nova Block Production and Withdrawals After Attack
The attack on Arbitrator contracts across Ethereum and Optimism has caused about $786,000 in losses. The team offered a 20% bounty for the return of funds.

zkLink said it halted block production on zkLink Nova and closed withdrawals after an ongoing attack targeting its Arbitrator contracts on Ethereum and Optimism, measures aimed at stopping further losses.
The team is urgently repairing the affected contracts and conducting a security review of all related components. Withdrawals were shut temporarily to cut off another route for the attack, and block production will remain paused while the review continues. The team plans to restore services only after it verifies that all risks have been removed.
About $786,000 has been lost in the attack. zkLink offered the attacker a 20% white-hat bounty in exchange for returning the funds and said it would not pursue further liability if the money is returned.
The incident spans Arbitrator contracts on Ethereum and Optimism, while the operational shutdown covers zkLink Nova. The next step is completion of repairs and the security review; services can return only after zkLink confirms all risks are gone.