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I have the hash of the transaction that called Chainlink's VRF but I need to get the hash of the callback transaction that gets executed after the RandomWordsRequested event is fulfilled.

How do I do that? Is there a way of getting that information?

I need this because an event that I want to track gets emitted in my smart contract after that callback is executed.

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You can find it if you navigate to the History (Recent fulfillments) tab of your VRF subscription at https://vrf.chain.link.

Also, you can monitor the VRFCoordinatorV2 contract itself for fulfillRandomWords function calls.

vrf

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