```\n        minTimestamp_ = _verifyValidatorSignatures(\n            msg.sender,\n            collateral_,\n            retrievalIds_,\n            metadataHash_,\n            validators_,\n            timestamps_,\n            signatures_\n        );\n        // rest of code\n        _updateCollateral(msg.sender, safeCollateral_, minTimestamp_);\n        // rest of code\n```\n