A set of Wardens: third-party searchers and verifiers of transactions. Warden is mainly responsible for retrieving DxChain and Ethereum and submitting legal transactions that need to be processed to Nitro Enclave. First, Warden will look for transactions that have been successfully sent to the Ethereum wallet or transactions that have been retrieved from DxChain. There must be enough funds to pay for related expenses, including the gas fee and cross-chain fees required, otherwise, the transaction will be rejected and Warden will not retrieve these transactions. Nitro Enclave requires a certain number of Wardens to submit the same transaction at the same time, then the bridge will send the corresponding transaction on another chain and submit legal transactions by providing a private key segment.