Interoperability protocol Celer Network has asked its users to revoke approval for several contracts after shutting down its cBridge following a suspected domain name system (DNS) hack. According to the project’s initial analysis, there was suspicious DNS activity around 7:00 p.m. UTC on Wednesday. However, as of this writing, the platform is still investigating and trying to find out more about the issue. Meanwhile, as the platform continues to identify the issue, the team has shut down the cBridge as the first way to prevent further incidents and protect users. The platform also advised its users to revoke token approvals for smart contracts on Ethereum, Polygon, Avalanche, BNB Smart Chain, Arbitrum, Astar, and Aurora. Users can access the token approvals page for each network if they wish to revoke approvals as a precaution while the platform continues to investigate the issue and provide a solution. In January, Ethereum co-founder Vitalik Buterin expressed his disapproval of cross-chain bridges due to their fundamental security limitations. According to Buterin, while the future will be multi-channel, it may not be multi-channel.