Verifying a User’s MetaMask Wallet Address
When using the MetaMask API to authenticate users of your application, it is essential to verify that the wallet address belongs to the user. In this article, we will explain how to do this.
Understanding the MetaMask API
Before diving into the verification process, let’s quickly review the basics of the MetaMask API:
- The “account” endpoint provides a list of available MetaMask wallets.
- The “getAccount” endpoint retrieves specific wallet information based on the address.
- The “login” endpoint authenticates users and returns an access token.
Verifying Wallet Address Ownership
To verify that a user’s wallet address belongs to them, you will need to retrieve the account details using the “getAccount” endpoint. Once you have the account details, compare them to the expected address in your application’s database or storage system.
Here is an example of how to get an account by its address:
const accountData = await accounts.getAccount(address);
Implementation example
async function authenticateUser() {
const address = '0x1234567890abcdef'; // Replace with the user's wallet address
try {
const response = await fetch('/api/login', {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
'address': address,
'secretKey': 'your_secret_key_here' // Replace with your secret key
})
});
const data = await response.json();
if (data.error) {
throw new Error(data.error);
}
const accountData = await accounts.getAccount(address);
console.log(Account information for address ${address}:);
console.log(accountData);
} catch (error) {
console.error(error);
}
}
In this example, we make a POST request to the endpoint “/api/login” with the user’s wallet address and secret key. The response will contain an “accountData” object containing the account details.
Wallet Address Ownership Comparison
To check whether a wallet address belongs to the user, compare it to the application’s database or storage system. You can do this by retrieving the account data and checking whether the provided address matches the expected one.
Here is an example implementation:
async function authenticateUser() {
const address = '0x1234567890abcdef'; // Replace the user's wallet address
try {
const response = await fetch('/api/login', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({
'address': address,
'secretKey': 'your_secret_key_here' // Replace with secret key
})
});
const data = await response.json();
if (data.error) {
throw new Error(data.error);
}
const accountData = await accounts.getAccount(address);
console.log(Wallet address belongs to user: ${accountData.address});
} catch (error) {
console.error(error);
}
}
In this example, we make a POST request to the endpoint “/api/login” with the user’s wallet address and secret key. The response will contain an “accountData” object containing the account details. We then compare the provided address with the one expected in your application’s database or storage system.
Conclusion
To verify whether a user’s wallet address belongs to them using the MetaMask API, you need to have some knowledge of the endpoint, the authentication flow, and the comparison logic. After following this article and implementing the suggested code samples, you should be able to authenticate your application’s users with MetaMask and verify whether their wallet addresses belong to them.