Introduction

What is ENS?
Why Reverse Resolve an ENS Name?
Tools You Need to Work with Chainbase
Set up a Free Account at Chainbase
Write a Script Using Chainbase API
Print the Reversed Resolved ENS Domain
Conclusion
FAQs

1. Introduction

When working with Ethereum Name Service (ENS), reverse resolving an ENS name allows you to retrieve the address associated with a given ENS name. This process is helpful in verifying ownership or interacting with smart contracts associated with the name. In this article, we will explore how to reverse resolve an ENS name using the Chainbase API.

2. What is ENS?

The Ethereum Name Service (ENS) is a decentralized domain name system built on the Ethereum blockchain. It enables users to register human-readable names for their Ethereum addresses, making it easier to interact with blockchain services.

3. Why Reverse Resolve an ENS Name?

Reverse resolving an ENS name is essential when you need to find the address associated with a specific ENS name. This can be useful in various scenarios, such as:

Verifying Ownership: You can check if a particular ENS name is owned by a specific address.
Interacting with Contracts: If a smart contract is associated with an ENS name, reverse resolving the name helps you discover the contract's address.

4. Tools You Need to Work with Chainbase

Before we dive into the process, make sure you have the following tools:

Chainbase Account: Sign up for a free account at Chainbase and obtain an API key.
IDE: You can use any Integrated Development Environment (IDE) of your choice. We will demonstrate examples using JavaScript and recommend using VS Code.

5. Set up a Free Account at Chainbase

To take advantage of Chainbase's capabilities, follow these steps:

Visit the Chainbase website and sign up for a free account.
Once logged in, navigate to the dashboard to get an overview of available features.
Create a new project in the dashboard to generate an API key.

6. Write a Script Using Chainbase API

To reverse resolve an ENS name using the Chainbase API, you can use JavaScript and make an API call. Here's an example using the fetch function:

const network_id = '1'; // Chain ID for Ethereum
const wallet_addr = '0x57511688c0ca7Cc7C25B90aE51C62B64652136Ac'; // Example wallet address

fetch(`https://api.chainbase.online/v1/ens/reverse?chain_id=${network_id}&address=${wallet_addr}`, {
    method: 'GET',
    headers: {
        'x-api-key': YOUR_CHAINBASE_API_KEY, // Replace with your API key
        'accept': 'application/json'
    }
})
.then(response => response.json())
.then(data => console.log(data.data))
.catch(error => console.error(error));

Alternatively, you can use the axios library to achieve the same result:

You need to install axios using npm install axios --save in the terminal first.

const network_id = '1'; // Chain ID for Ethereum
const wallet_addr = '0x57511688c0ca7Cc7C25B90aE51C62B64652136Ac'; // Example wallet address

const axios = require('axios');
const options = {
    url: `https://api.chainbase.online/v1/ens/reverse?chain_id=${network_id}&address=${wallet_addr}`,
    method: 'GET',
    headers: {
        'x-api-key': YOUR_CHAINBASE_API_KEY, // Replace with your API key
        'accept': 'application/json'
    }
};

axios(options)
.then(response => console.log(response.data.data))
.catch(error => console.log(error));

Remember to replace YOUR_CHAINBASE_API_KEY with your actual API key obtained from Chainbase.

7. Print the Reversed Resolved ENS Domain

The Chainbase API's getENSReverse endpoint takes the chain ID and wallet address as parameters and returns the reversed resolved ENS domain name. To print the data, follow these steps:

Save the script in a file with a .js extension.
Open a terminal and navigate to the directory containing the script file.
Run the command node <filename>.js, where <filename> is the name of the script file.
The output will display the reversed resolved ENS domain information.

For example, running the script with Xiaocong's wallet address as input returns the following data:

jsonCopy code
[
  {
    "address": "0x57511688c0ca7cc7c25b90ae51c62b64652136ac",
    "expiration_time": "2023-04-17T14:19:21Z",
    "name": "lxcong",
    "owner": "0x57511688c0ca7Cc7C25B90aE51C62B64652136Ac",
    "registrant": "0x57511688c0ca7cc7c25b90ae51c62b64652136ac",
    "registrant_time": "2022-04-17T08:30:09Z",
    "resolver": "0x4976fb03c32e5b8cfe2b6ccb31c09ba78ebaba41",
    "text_records": {},
    "token_id": "63135721284494715790867739452503301817186787830065141439742276093364926543362"
  }
]

In this example, the reversed resolved ENS domain name for Xiaocong's wallet address on Ethereum is "lxcong.eth."

8. Conclusion

Reverse resolving an ENS name allows you to retrieve the associated address, verifying ownership or interacting with smart contracts. By using the Chainbase API and following the steps outlined in this article, you can easily reverse resolve ENS names on Ethereum or other compatible chains.

If you have any further questions or need assistance, feel free to check out the FAQs section below.

9. FAQs

1. Can I reverse resolve any ENS name?

No, you can only reverse resolve ENS names that have been registered on the blockchain. Unregistered names do not have associated addresses and cannot be reverse resolved.

2. How can I obtain an API key from Chainbase?

To obtain an API key, sign up for a free account in our website, create a new project in the console, and generate an API key associated with your project.

3. Are there any limitations on the number of reverse resolves I can perform?

We have rate limits or usage restrictions based on your account type. Refer to the documentation or contact their support for detailed information.

4. Can I use languages other than JavaScript to interact with the Chainbase API?

Yes, we provides API endpoints that can be accessed using various programming languages. You can choose a language that suits your development environment and preferences.

5. How can I learn more about ENS and its capabilities?

To learn more about Ethereum Name Service (ENS), you can visit the official ENS documentation or explore additional resources available online.

About Chainbase

Chainbase is an all-in-one data infrastructure for Web3 that allows you to index, transform, and use on-chain data at scale. By leveraging enriched on-chain data and streaming computing technologies across one data infrastructure, Chainbase automates the indexing and querying of blockchain data, enabling developers to accomplish more with less effort.

Want to learn more about Chainbase?

Visit our website chainbase.com Sign up for a free account, and Check out our documentation.

Website｜Blog｜Twitter｜Discord｜Link3

The original link：https://chainbase.com/blog/article/how-to-resolve-an-ens-name

How to Reverse Resolve an ENS Name

Table of Contents