zkLink has paused block production for zkLink Nova and temporarily closed withdrawals following an ongoing attack targeting the Arbitrator contracts on Ethereum and Optimism. The team urgently patched affected contracts to cut off further attack vectors and is conducting a comprehensive security review of all related components. Earlier reports indicated approximately $786,000 was lost in the cross-chain bridge exploit. zkLink stated that Nova services will only resume after all risks are confirmed eliminated. The project offered attackers a 20% white-hat bounty if funds are returned, with no further liability pursued.