The Difference Between EIP191 and EIP712

In the Ethereum ecosystem, EIP191 and EIP712 are essential standards that govern transactions. This article explores the key differences, including structure, encoding, data types, formats, security considerations, and message integrity mechanisms.

Structure and Encoding

The structure of EIP191 follows a specific format designed to provide essential information about the transaction. It includes various fields and parameters that are organized in a way that allows for efficient data retrieval and processing. These fields serve to enhance the transparency and clarity of the transaction, making it easier to understand its purpose and context.

This encoding process ensures compatibility and consistency across different Ethereum implementations. By converting the data into a standardized format, EIP191 facilitates seamless communication and interoperability between various Ethereum applications and protocols.

In contrast to EIP191, EIP712 introduces a different structure and encoding process for data payloads. It defines a specific data schema that includes a set of predefined fields and their corresponding data types. This structured schema allows for a more granular and organized representation of the transaction data.

The encoding process in EIP712 incorporates cryptographic principles to enhance the security and integrity of Ethereum transactions. Before encoding, the data payload is hashed, and a cryptographic signature is generated. This signature ensures that the message has not been tampered with during transmission, providing a robust mechanism for verifying the authenticity and integrity of the transaction.

Data Types and Formats

EIP191 supports various data types to accommodate different kinds of information in Ethereum transactions. These data types include integers, strings, booleans, addresses, and more. By providing flexibility in data representation, EIP191 enables transactions to carry a wide range of information necessary for different use cases.

In terms of data formats, EIP191 follows a structured approach. It defines specific fields and their corresponding data types, ensuring consistent formatting across different implementations. This standardized format enhances compatibility and facilitates seamless integration between Ethereum applications.

Similar to EIP191, EIP712 supports a diverse set of data types to represent transaction information. These data types include integers, strings, addresses, arrays, and nested structures. The inclusion of array and nested structure types allows for more complex and sophisticated data representations in Ethereum transactions.

When it comes to data formats, EIP712 introduces a specific schema that defines the structure and organization of the data payload. This structured format enables clear delineation of fields and their data types, providing a well-defined structure for the transaction data. The defined schema helps ensure consistency and interoperability between different Ethereum implementations.

Understanding the differences in data types and formats between EIP191 and EIP712 is crucial for developers and users to select the appropriate standard for their specific requirements. By utilizing suitable data types and formats, Ethereum stakeholders can accurately represent and process transaction information, fostering efficient communication and interoperability within the Ethereum ecosystem.

Security and Message Integrity

Security is a vital consideration in Ethereum transactions, and EIP191 addresses this aspect by providing a framework for message integrity verification. It ensures that the data included in the transaction remains intact and unaltered during transmission.

Message integrity verification in EIP191 is achieved through the use of hashes. The data payload is hashed before transmission, generating a unique hash value. Upon receiving the message, the recipient can perform the same hashing process and compare the resulting hash value with the original. If they match, it confirms the integrity of the message.

Similar to EIP191, EIP712 places a strong emphasis on security and message integrity. It introduces cryptographic principles to enhance the security of Ethereum transactions. Before encoding, the data payload is hashed, and a cryptographic signature is generated using the private key of the sender.

Upon receiving the message, the recipient can verify the integrity and authenticity of the transaction by using the public key associated with the sender’s private key. By validating the cryptographic signature, EIP712 ensures that the message originated from the expected sender and that its contents remain unchanged.

Understanding the security considerations and message integrity mechanisms provided by EIP191 and EIP712 is crucial for ensuring the trustworthiness and reliability of Ethereum transactions. By employing these standards appropriately, developers and users can enhance the security of their applications and maintain the integrity of data transmitted within the Ethereum ecosystem.


Differentiating between EIP191 and EIP712 is crucial for leveraging their strengths within the Ethereum ecosystem. EIP191 offers a structured approach to encoding data, while EIP712 enhances security through cryptographic signatures. By grasping these distinctions, developers, and users can make informed decisions about which standard to employ based on their specific use cases.


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