verifiable randomness

zkVRF: Zero Knowledge Verifiable Randomness

ORAO zkVRF, powered by Zokrates' zk-SNARKs, offers verifiable, secure randomness on compatible EVM blockchains, enhancing the privacy and reliability of decentralized applications.

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ORAO zkVRF vs Chainlink VRF comparison

Feature	ORAO Network	Chainlink
Blockchain integration	Polygon, other EVM chains	Multi-Chain (Ethereum, BSC...)
zk type	zk-SNARKs based VRF	NONE
Security	Advanced security with zk-SNARKs	Established
Speed	30s	3min+

Integrate zkVRF

Solidity example

The full SDK is available on the github repo alongside an example Solidity contract which mints an NFT with random features.

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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 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);
  }
}

Solidity SDK

zkVRF on Github