vrf.md

Orakl Network VRF (Verifiable Random Function)

Everything in this document should be executed from the root directory of the following git repository.

git clone https://github.com/Bisonai/vrf-consumer

0. Install dependencies

yarn install

1. Create mnemonics

npx mnemonics

2. Create .env file

MNEMONIC=<YOUR MNEMONIC FROM STEP 1>
PROVIDER=https://api.baobab.klaytn.net:8651

3. Convert mnemonic to address

npx hardhat address --mnemonic "<YOUR MNEMONIC FROM STEP 1>"

4. Request $KLAY

Insert your address from previous step and request $KLAY.

https://baobab.wallet.klaytn.foundation/faucet

5. Examine consumer smart contract code

https://github.com/Bisonai/vrf-consumer/blob/master/contracts/VRFConsumer.sol

Temporary Account

function requestRandomWords(
    bytes32 keyHash,
    uint32 callbackGasLimit,
    uint32 numWords,
    address refundRecipient
) external payable returns (uint256 requestId);

Permanent Account

function requestRandomWords(
    bytes32 keyHash,
    uint64 accId,
    uint32 callbackGasLimit,
    uint32 numWords
) external returns (uint256 requestId);

6. Deploy to Baobab

yarn compile

npx hardhat deploy --network baobab

7. Request for VRF with a temporary account

npx hardhat run scripts/read-vrf.ts --network baobab

npx hardhat run scripts/request-vrf-direct.ts --network baobab

8. Create a permanent account and deposit $KLAY

npx hardhat createAccount --network baobab

npx hardhat deposit \
    --account-id $ACCOUNT \
    --amount $AMOUNT \
    --network baobab

9. Add a consumer to a permanent account

npx hardhat addConsumer \
    --consumer $CONSUMERADDRESS \
    --account-id $ACCOUNT \
    --network baobab

10. Request for VRF with a permanent account

npx hardhat run scripts/read-vrf.ts --network baobab

npx hardhat run scripts/request-vrf.ts --network baobab