This oracle checks Google’s DNS service to determine if a given domain is owned by a given blockchain address.

Steps For Using This Oracle

• Write and deploy your Chainlink contract using the network details below
• Fund it with LINK
• Call your request method

Network Details

Ethereum Mainnet

Payment Amount: 1 LINK
LINK Token Address: 0x514910771AF9Ca656af840dff83E8264EcF986CA
Oracle Address: 0x240BaE5A27233Fd3aC5440B5a598467725F7D1cd
JobID: 6ca2e68622bd421d98c648f056ee7c76

Ethereum Kovan Testnet

Payment Amount: 0.1 LINK
LINK Token Address: 0xa36085F69e2889c224210F603D836748e7dC0088
Oracle Address: 0x56dd6586DB0D08c6Ce7B2f2805af28616E082455
JobID: 791bd73c8a1349859f09b1cb87304f71

Binance Smart Chain Mainnet

Payment Amount: 0.1 LINK
LINK Token address:0x404460C6A5EdE2D891e8297795264fDe62ADBB75
Oracle Address: 0x63B72AF260E8b40A7b89E238FeB53448A97b03D2
JobID: fb06afd5a9df4e6cb156f6b797b63a24

Polygon (Matic) Mainnet

Payment Amount: 0.1 LINK
LINK Token Address: 0xb0897686c545045aFc77CF20eC7A532E3120E0F1
Oracle Address: 0x63B72AF260E8b40A7b89E238FeB53448A97b03D2
JobID: f3daed2990114e98906aaf21c4172da3

Create Your Contract

Import ChainlinkClient.sol into your contract so you can inherit the Chainlink behavior.

pragma solidity ^0.4.24;

import "@chainlink/contracts/v0.4/ChainlinkClient.sol";

contract DnsOwnershipChainlink is ChainlinkClient {

  uint256 oraclePayment;

  constructor(uint256 _oraclePayment) public {
    setPublicChainlinkToken();
    oraclePayment = _oraclePayment;
  }
  // Additional functions here:

}

pragma solidity ^0.5.0;

import "@chainlink/contracts/v0.5/ChainlinkClient.sol";

contract DnsOwnershipChainlink is ChainlinkClient {

  uint256 oraclePayment;

  constructor(uint256 _oraclePayment) public {
    setPublicChainlinkToken();
    oraclePayment = _oraclePayment;
  }
  // Additional functions here:

}

pragma solidity ^0.6.0;

import "@chainlink/contracts/v0.6/ChainlinkClient.sol";

contract DnsOwnershipChainlink is ChainlinkClient {

  uint256 oraclePayment;

  constructor(uint256 _oraclePayment) public {
    setPublicChainlinkToken();
    oraclePayment = _oraclePayment;
  }
  // Additional functions here:

}

Tasks

• DNS Record Check
• Copy
• EthBool
• EthTx

Request Parameters

type

Always use TXT

Solidity Example

req.add("type", "TXT");

name

The domain name to check ownership of.

Solidity Example

req.add("name", "www5.infernos.io");

record

The Ethereum address to check a given domain against.

Solidity Example

req.add("record", "0xf75519f611776c22275474151a04183665b7feDe");

Chainlink Examples

The examples below show how to create a request for the Chainlink node.

requestProof function

function requestProof
(
  address _oracle,
  bytes32 _jobId,
  string memory _txt,
  string memory _name,
  string memory _record
)
  public
  onlyOwner
{
  Chainlink.Request memory req = buildChainlinkRequest(_jobId, address(this), this.fulfill.selector);
  req.add("type", _txt);
  req.add("name", _name);
  req.add("record", _record);
  sendChainlinkRequestTo(_oracle, req, oraclePayment);
}

fulfill function

bool public proof;

function fulfill(bytes32 _requestId, bool _proof)
  public
  recordChainlinkFulfillment(_requestId)
{
  proof = _proof;
}