Request Random Words

Authorize an Address to Request Random Words

After deploying the CrossChainVRFWrapper contract, the first step is to authorize an address to make requests for random words. This ensures that only specific addresses linked to a subscription can request VRF.

• Use the addAuthorizedAddress function to authorize a specific address with a given subscription ID. This step allows the address to make random word requests through the wrapper.

cast send --rpc-url <RPC_URL> --private-key <PRIVATE_KEY> $VRF_WRAPPER "addAuthorizedAddress(address caller, uint256 subscriptionId)" $VRF_CONSUMER $VRF_SUBSCRIPTION_ID

Request Random Words from CrossChainVRFConsumer

Once the address is authorized, the next step is to send a request for random words from the CrossChainVRFConsumer contract on the unsupported L1. This request is then sent to the CrossChainVRFWrapper via a cross-chain message.

cast send --rpc-url <RPC_URL> --private-key <PRIVATE_KEY> $VRF_CONSUMER "requestRandomWords(bytes32 keyHash, uint16 requestConfirmations, uint32 callbackGasLimit, uint32 numWords, bool nativePayment, uint32 requiredGasLimit)" <KEY_HASH> <CONFIRMATIONS> <GAS_LIMIT> <NUM_WORDS> <NATIVE_PAYMENT> <REQUIRED_GAS_LIMIT>

Replace the placeholders with:

• <KEY_HASH>: The VRF key hash used for random word generation.
• <CONFIRMATIONS>: Number of confirmations required for the request.
• <GAS_LIMIT>: The gas limit for the VRF callback function.
• <NUM_WORDS>: The number of random words requested.
• <NATIVE_PAYMENT>: Indicates whether the payment will be made in the native token.
• <REQUIRED_GAS_LIMIT>: The gas limit required for the cross-chain message to be processed.