Signing structured data is more secure than signing raw hex messages. This test involves visiting a DApp that requests an EIP-712 signature, which is used for more complex and readable interactions like limit orders or identity verification. The MetaMask signature pop-up should display the data in a structured, human-readable format (like a form with fields and values), not as an indecipherable hex string. This allows the user to clearly understand what they are signing. The test is successful if the signature is generated and the DApp accepts it, and crucially, if the user was presented with a clear and parsable summary of the data they agreed to sign. The adoption of EIP-712 is a major step forward for user security, and its implementation is a key feature detailed on metamask.
