I can provide yu without an article on validating the personal_sign field in Metamask.

Validate Personal Sign in Metamask Backend

Metamask is a popular Ethereum of application that allows to securly interact with the Ethereum network. One of its features is the ability to sign from messages, it as as as as as of ientification for the usr.

In this article, we will tell discuss the validate

Understanding Personal Sign

The personal_sign field is used to verify It is generated using a cryptographic algorithm and can be used to confirm that message was intended.

Howver, whens signs person messages in the stand-side JavaScript code, it is a ethers library, one provides a ith-level interact racts. Unfortunately, the ethers library does not provide of direct performance to the underlying blockchain’s metal’s metadata, inclinging consumer identities.

Validating Personal Sign Using Blockchain Metadata

To validate the personal_sign field in Metamask’s backend, we need to the reading the blockchain’s metadata and verify that matches. We can achieve to achieve this following steps.

• Get the blockchain metadata: We need to retrieve the blockchain’s metal’s metadata, including consumer identities, from the Ethereum network.

• Verify the Personal sign

  

  : October we have blockchain metadata, we can compare

Here is an example of house can in the implement that in Metamask’s backend:

`javascript

const metamask = require('@metamask/client-api');

const ethers = require('eters');

// Get the blockchain metadata

async feunction getBlockchainMetadata() {

const provider = await metamask.getProvider();

const chainId = await provider.getChainId();

const blockchainMetadata = await provider.getChainIdMetadata(chainId);

// Get user identities from the blockchain metadata

const userIds = [];

for (const id in blockchainMetadata.userIds) {

userIds.push(blockchainMetadata.userIds[id]);

}

return { conserIds };

}

// Verify the Personal sign

async function verifySign(userIds, expectedPersonalSign) {

// Get the Ethereum accountred of the one

const accountAddress = await metamask.getAccounts()[0];address;

// Create a new EIP-711 signature objection theer ID and expected personal

const signature = ethers.sigs.sigs.Eip712Signature(

'Personal Sign',

[accountAddress, userIds.join(',')],

expectedPersonalSign,

);

// Verify the signature use Ethereum's EIP-712 library

if (await signature.verify(blockchainMetadata.chainId)) {

return true;

} else {

return false;

}

}

`

Example Use Case

In this example, we can a new Metamask backend that retrieves We can one thing that function to validate user identities on the standite-side JavaScript code:

`javascript

const metamask = require(‘@metamask/client-api’);

const ethers = require(‘eters’);

// Create a new Metamask backend

async function createBackend() {

const provider = await metamask.getProvider();

// Get the blockchain metadata

const userIds = await yourtBlockchainMetadata();

// Verify the Personal sign for each

let isValid = true;

UserIds.forEach(serId, index) => {

const extraPersonalSign = ethers.utils.sigs.Eip712Signature(

‘Personal Sign’,

[userId, userIds.join(‘,’)],

consumerId,

);

if (!