I can provide a step -by -step guide on how to get the hash of the Fulfillrandomwords transaction (call return) in Ethereum.
What is Chainlink VRF?
Chainlink VRF means a verifiable random function, which is a generator of decentralized random numbers used to generate truly random numbers. It is an essential part of the Ethereum block chain, since it allows developers to access random numbers safely and reliable.
How does Chainlink VRF work?
When it calls a function in Chainlink VRF, such as Chainlink-VRF-Randomwords, the node (for example, a Node.js program or a command line interface) generates a random number and returns it in response. The node verifies this number using a digital signature.
How to obtain the hash of the Fulfillrandomwords transaction (call return)?
To obtain the hash of the Fulfillrandomwords transaction (call return), it must:
- Check your Chainlink VRF configuration : Make sure your Node.js program or command line interface is configured with the correct configuration for Chainlink VRF, including the
KeyidySecretproperties.
- Call the Fulfillrandomwords function : When a transaction calls
Chainlink-VRF-Rondomwords, it generates a random number using the Chainlink VRF. The resulting hash will be returned in response.
- Verify the answer
: The Node.js program or the command line interface must verify that Chainlink VR’s response is correct and coincides with the expected format.
Example code node.js
`JavaScript
const chainlink = request ('@chainlink/api');
// Set your Keyid and Secret
const keyid = 'your_key_id';
Const Secretar = 'Your_secret';
// Call the Fulfillrandomwords function
Async Function Getfulrandomwordshash () {
Constth = alea chacklink.vrf.randomwords ({keyid, secret});
Console.log (answer);
// Verify the answer to ensure that it coincides with the expected format
if (answer.data.length! == 16) {
throw a new error ('non -valid response length');
}
// Returns the hash of the transaction Fulfillrandomwords (call return)
Return response.
}
// Call the function and print the result
Getfulrandomwordshash (). Then ((hash) => console.log (hash));
Additional tips
- Be sure to replaceyour_Key_id
andyour_secret` with its key and secret ID of the Chainlink Real VRF key, respectively.
- The length of the expected hash can vary according to its Node.js program or implementation of the command line interface. You can verify the response format verifying the documentation for your specific tools.
- Note that the Fulfillrandomwords transaction (call return) is a random number generator, so your output will be different every time it is called.
Following these steps and using Crainlink VRF correctly, you should get the hash of the Fulfillrandomwords transaction (call return).
