vrfCoordinatorV2 address after Sepolia update

[Shawon-Mandal]

I am currently in lesson:14 and I have been using Goerli up until now.But I was having some problem because my

helper-hardhat-config.js

had the goerli setup.So,While I was updating helper-hardhat-config I found error in my terminal that it cant read properties of my

vrfCoordinatorV2

so,I used the vrfCoordinatorV2 address provided in the github repo associated with this course and it worked perfectly fine.

Now,my question is that shouldn't I have my own personal vrfCoordinatorV2 address?
I passed this part a long time ago and had a break from the course.Now,I cant seem to remember how I set it up in the first place 😅

[pacelliv]

Hello @Shawon-Mandal, we don't have personal addresses for the VRFCoordinatorV2. We use the address of the contract on the respective chain.

Maybe what you're trying to remember is how to create a VRF subscription id to subscribe a contract and request for randomness. If that's the case => https://vrf.chain.link/.

[Shawon-Mandal]

@pacelliv I already have the id and I am running 4 contracts at the same time.
"basic nft" "random ipfs nft " and " dynamic nft" .Now should I add their deployed address as consumer?

[Shawon-Mandal]

@pacelliv tell me just one thing.Am I supposed to use the vrfCoordinatorv2 provided in the github repo?
Or was I supposed to get it from my subscription from the vrf.chain.link?

[pacelliv]

Yes, you should use the vrfCoordinatorV2 from the repo as well as the rest of the variables in the configs that appeared in helper-hardhat-config file for each lesson except the subscriptionId because that's just a placeholder for reference.

If one of your contracts is going to consume randomness from the VRFCoordinatorV2 this is the flow:

• Create a suscriptionId (if you don't have one already) in https://vrf.chain.link/ and fund it with LINK token
• Add your subscriptionId in the helper-hardhat-config file for the respective chain
• Deploy the contract
• Go back to https://vrf.chain.link/ to add your deployed contract as a consumer

If you deploy first and then add the subscriptionId it will not work.

After these steps you can request for randomness and the VRF service will be listening for the requests from your contract.

[Shawon-Mandal]

@pacelliv Thanks for your help!Really appreciate it!