©️ NFCCHIP.ETH

Creating infinite subdomains for an ENS (Ethereum Name Service) domain like `nfcchip.eth` involves several steps. Here's a detailed guide on how to achieve this:

### Prerequisites

1. **Ethereum Wallet**: You need a wallet like MetaMask, Trust Wallet, or any other Ethereum-compatible wallet.

2. **ETH**: Some ETH in your wallet to cover transaction fees.

3. **ENS Domain**: You need to own the ENS domain (`nfcchip.eth`).

### Steps to Create Subdomains

#### Step 1: Access the ENS Manager

1. Go to the [ENS Manager](https://app.ens.domains/).

2. Connect your Ethereum wallet.

#### Step 2: Navigate to Your Domain

1. Enter `nfcchip.eth` in the search bar and select it.

2. Ensure that the domain is registered under your wallet address.

#### Step 3: Add Subdomains

1. **Subdomain Management**: In the ENS Manager, you’ll find an option to manage subdomains.

2. **Create Subdomain**: 

   - Enter the desired subdomain name.

   - For example, enter `example` to create `example.nfcchip.eth`.

3. **Assign Records**: Assign the resolver and the address (if needed) for the subdomain.

4. **Confirm Transaction**: Confirm the transaction in your Ethereum wallet. This will create the subdomain on the blockchain.

#### Step 4: Automate Subdomain Creation (Optional)

To automate subdomain creation, you can deploy a smart contract that allows users to create subdomains dynamically.

#### Example Smart Contract

Here’s a simple Solidity contract to enable dynamic subdomain creation:

```solidity

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface ENS {

    function setSubnodeRecord(bytes32 node, bytes32 label, address owner, address resolver, uint64 ttl) external;

    function setOwner(bytes32 node, address owner) external;

}

contract SubdomainManager {

    ENS public ens;

    bytes32 public rootNode;

    address public resolver;

    constructor(address _ens, bytes32 _rootNode, address _resolver) {

        ens = ENS(_ens);

        rootNode = _rootNode;

        resolver = _resolver;

    }

    function createSubdomain(string memory label, address owner) public {

        bytes32 labelHash = keccak256(abi.encodePacked(label));

        bytes32 subdomainNode = keccak256(abi.encodePacked(rootNode, labelHash));

        ens.setSubnodeRecord(rootNode, labelHash, owner, resolver, 0);

        ens.setOwner(subdomainNode, owner);

    }

}

```

#### Steps to Deploy the Contract

1. **Compile and Deploy**: Compile and deploy the contract using Remix or any other Solidity development environment.

2. **Set Parameters**: 

   - `_ens`: Address of the ENS registry contract.

   - `_rootNode`: `keccak256(abi.encodePacked(namehash("eth"), keccak256("nfcchip")))`.

   - `_resolver`: Address of the resolver contract.

3. **Use the Contract**: After deployment, you can interact with the contract to create subdomains.

### Interacting with the Contract

1. **Access Contract**: Use a tool like Etherscan, MyEtherWallet, or directly through your wallet’s interface to interact with the contract.

2. **Create Subdomain**: Call the `createSubdomain` function with the desired label and owner address.

### Example Transaction

To create a subdomain `example.nfcchip.eth` for the address `0xYourAddress`, call the function like this:

```javascript

createSubdomain("example", "0xYourAddress");

```

### Conclusion

By following these steps, you can manage and create subdomains for your ENS domain `nfcchip.eth`. The smart contract approach provides a scalable solution to create an infinite number of subdomains dynamically. Ensure you understand and securely manage your Ethereum transactions and contracts to maintain control over your domain and subdomains.