zkVRF: Zero-Knowledge Verifiable Random Function
ORAO zkVRF, powered by ZoKrates' zk-SNARKs, delivers verifiable, secure randomness to EVM-compatible blockchains, enhancing the privacy, efficiency, and reliability of decentralized applications.
At ORAO, we’ve developed a cutting-edge zero-knowledge Verifiable Random Function (zkVRF) tailored for EVM-compatible blockchains. Our zkVRF is now optimized with Poseidon hashing, reducing fulfillment times to just 10 seconds on Polygon, delivering fast, secure, and cost-effective randomness generation for a variety of decentralized applications.
Key Use Cases
- Crypto Gambling:
Ensure provably fair outcomes in games of chance, such as dice rolls, card games, or any other type of wagering in decentralized casinos and gambling platforms. - Lotteries:
Generate secure, tamper-proof random numbers to fairly determine winners, providing users with trustless and transparent lottery systems. - NFT Drops:
Fairly distribute limited-edition NFTs by generating randomness to assign token IDs or select winners from participants in highly anticipated NFT mints. - Decentralized Games:
Introduce unpredictability in blockchain-based games through random events, loot drops, or character traits, improving gameplay fairness and enhancing user experience. - Randomized Airdrops:
Distribute tokens or rewards randomly to a pool of eligible wallets, ensuring fair participation in community-driven initiatives. - Auction Systems:
Enable secure randomness for time-sensitive auctions, ensuring unpredictable and unbiased outcomes.
ORAO zkVRF vs Chainlink VRF comparison
| Feature | ORAO Network | Chainlink |
|---|---|---|
| Speed | 10s | 3min+ |
| Blockchain integration | Polygon, Zircuit, other EVM chains | Multi-Chain (Ethereum, BSC...) |
| zk type | zk-SNARKs based VRF | NONE |
| Security | Advanced security with zk-SNARKs | Established |
| Gas Fees | Low | High |
| upcoming Networks | Arbitrum, Starknet | - |
Technical Features
- Fulfillment Time:
With the latest Poseidon hashing, zkVRF achieves 10-second fulfillment on Polygon (Amoy Testnet), offering rapid and efficient randomness generation. - zk-SNARKs:
Our zkVRF leverages zk-SNARKs (Zero-Knowledge Succinct Non-Interactive Arguments of Knowledge) to ensure cryptographic security, scalability, and privacy for sensitive use cases. - EVM Compatibility:
Ready for deployment across EVM-compatible networks, zkVRF integrates seamlessly into decentralized applications. - Deployed Networks:
Available on Polygon (Amoy Testnet) and Zircuit Testnet with upcoming deployments on Arbitrum and Starknet.
A Proven Solution
With more than 60,000+ VRF requests successfully fulfilled on Solana Mainnet, ORAO's zkVRF delivers fast, secure, and trustless randomness to EVM-compatible blockchains. Whether you’re building a decentralized game, a lottery system, or launching an NFT drop, zkVRF ensures your dApp’s randomness is both fair and verifiable.
Integrate zkVRF
contract OraoVRFConsumer is OraoVRFConsumerBase {
bytes32 public seed;
bytes32 public part1;
bytes32 public part2;
IOraoVRF internal _vrfCoordinator;
constructor(address vrfCoordinator) OraoVRFConsumerBase(vrfCoordinator) {
_vrfCoordinator = IOraoVRF(vrfCoordinator);
}
function calcGasUsed() public override returns (uint256 gasUsed) {
uint256 startGas = gasleft();
fulfillRandomness(
0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff,
0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff,
0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
);
gasUsed = startGas - gasleft();
}
function fulfillRandomness(bytes32 _seed, bytes32 _part1, bytes32 _part2) internal override {
seed = _seed;
part1 = _part1;
part2 = _part2;
}
function request(bytes32 _seed) public payable override {
seed = _seed;
super.request(_seed);
}
}