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A Layer 2 Rollup Solution for Decentralized Verifiable Random Functions

🚀 Random VRF Example App: https://app.random-network.org/

🚀 Explorer: https://testnet.random-network.org

🚀 RPC: http://167.172.174.224:8547

📖 Overview

Random Network is a specialized Layer 2 rollup built on Arbitrum Orbit that provides secure, verifiable randomness for decentralized applications. By leveraging the Espresso Network architecture, we've created a scalable VRF (Verifiable Random Function) solution that maintains the security guarantees of L1 while offering improved performance and cost efficiency.

🚀 Features

• Decentralized Randomness: Truly unpredictable and tamper-resistant random number generation
• L2 Scalability: Lower costs and faster confirmation times than L1-based VRF solutions
• Cross-Chain Compatibility: Use our VRF service from multiple networks
• Verifiable Results: Cryptographic proofs ensure integrity of random number generation
• Developer-Friendly: Simple integration for dApps needing secure randomness

✨ Response Time Benchmark

Blockchain	Random Network
Arbitrum Sepolia	~10 seconds
Ethereum Sepolia	~30 seconds
Optimism Sepolia	~10 seconds

How It Works

🔧 Architecture

Random Network consists of several key components working together to provide secure, verifiable randomness:

1. VRF Core: The central randomness generation service deployed on Random Network rollup that:

   • Receives randomness requests via Hyperlane's cross-chain messaging protocol
   • Manages request lifecycle from receipt to execution
   • Validates VRF proofs before sending results back to the requesting chain

2. VRF Request: The client-side contract deployed on supported chains that:

   • Allows dApps to request randomness by sending a message to the VRF Core
   • Receives and verifies randomness results from the VRF Core
   • Forwards verified random values to the requesting contracts
   • Supports payment for randomness services via native token transfers

3. VRF Verification Library: Cross-chain cryptographic verification system that:

   • Ensures the integrity of random values through cryptographic proofs
   • Provides a common verification standard across all supported chains

4. Rollup Infrastructure: Arbitrum Orbit-based L2 powered by Espresso Network that:

   • Processes VRF requests with high throughput and low latency
   • Maintains security guarantees through the Espresso Network's consensus mechanism
   • Provides a dedicated environment optimized for randomness operations

5. Hyperlane Integration: Cross-chain messaging system that:

   • Enables secure communication between different blockchains
   • Handles message routing and delivery between the VRF Request and VRF Core contracts
   • Provides interchain security modules for message verification

6. Open Intents Framework: Open-source framework that:

   • Enables Hyperlane cross-chain messaging solver

7. VRF Executor Service: Off-chain service that:

   • Monitors for new randomness requests
   • Generates cryptographic proofs for random values
   • Submits proofs to the VRF Core contract for validation

📝 Usage

Requesting Randomness

To integrate Random Network's VRF service into your smart contract, implement the randomness consumer interface and follow these steps:

// Example Solidity Integration

// Interface for receiving randomness callbacks
interface IRandomConsumer {
    function receiveRandomness(bytes32 requestId, uint256 randomness) external;
}

contract MyGame is IRandomConsumer {
    // The VRF Request contract on your chain
    VRFRequestV1 public immutable VRF_REQUEST;
    
    uint256 public randomResult;
    bytes32 public lastRequestId;
    
    constructor(address vrfRequestAddress) {
        VRF_REQUEST = VRFRequestV1(vrfRequestAddress);
    }
    
    // Request randomness by sending a transaction with ETH payment
    function requestRandomNumber() external payable {
        // Optional parameters can be passed to influence randomness generation
        bytes memory parameters = "";
        
        // Specify gas limit for the callback function
        uint256 callbackGasLimit = 100000;
        
        // Forward ETH payment with the request
        lastRequestId = VRF_REQUEST.requestRandomness{value: msg.value}(
            parameters,
            callbackGasLimit
        );
    }
    
    // Callback function that receives the verified random value
    function receiveRandomness(bytes32 requestId, uint256 randomness) external override {
        // Verify the sender is our trusted VRF contract
        require(msg.sender == address(VRF_REQUEST), "Unauthorized VRF fulfillment");
        require(requestId == lastRequestId, "Unknown request ID");
        
        // Store and use the randomness
        randomResult = randomness;
        
        // Your game logic using the random value
        // e.g., mintRandomNFT(randomness);
    }
}

📊 Contract Deployments

Rollup Infrastructure

Rollup Hash: 0xee1608426e90e7e6be3bc624412913ba51913e92422a46b2d341cc3287788983

Contract	Address
RollupProxy	0x51eCf345dC279b8933754A9541A7f3F46e2588F9
Inbox (proxy)	0x2EBA5958Fe4f2b048CFCf901033f7b245d8F6Cc7
Outbox (proxy)	0x72703FDF652af65E540A888f6540A92E49C35C60
rollupEventInbox (proxy)	0x388301F428596b9EC1912E7DBD6Dd4E13f0bDaBe
challengeManager (proxy)	0xCA5d70851bfee1E7e0b872A43292e8660f9B60AA
AdminProxy	0x3B3524742488e22Be24F871eA8ec868E4f76f5BA
SequencerInbox (proxy)	0xDA86cb34DA3441363aEB33ed5e0AE00DaA85D2e2
Bridge (proxy)	0x123d4366000f68Df709B86e6E017499c5236C66E
ValidatorUtils	0x22d70A6bBA034d86E7d9f548Abd71D819AE19D41
ValidatorWalletCreator	0x026AeAc2B3929D362D88D6Af57A88bC85BbAaeA5
EthBridge	0xd596372b7E9a482349dffA3Bd2cCEa74687eD42e
EthSequencerInbox	0xC2411397Ad13e467262161803418df537F64389b
EthInbox	0x4016546b61348Ee9a662B700e767Db0265DC0d98
EthRollupEventInbox	0xcaB6ab37aA8E4F7B2486f4C285e489106f78F256
EthOutbox	0xa8b998386A457b3F00225552293B70517E4F5497
ERC20Bridge	0x42C51958D80DB2EdbA18765FD50f5BC6a69716c2
ERC20SequencerInbox	0x23534e3611933cfA9551571859E090F930fb99ab
ERC20Inbox	0x897a589Ac7F0613ED2F226c8092b6B60C226d8D1
ERC20RollupEventInbox	0x36999201046fdf055aF4AB7FdA7E9720c6fDCBaf
ERC20Outbox	0x4E33FEFeFAD3eE2FAfBE322E461C67bafA8157FD
BridgeCreator	0xd596372b7E9a482349dffA3Bd2cCEa74687eD42e
OneStepProver0	0xA2475685bfBd5298A407844ab722b88204B18DcC
OneStepProverMemory	0x44b638734c7FE517b4aAfD186e84efAB90ae40a5
OneStepProverMath	0x949c904B885B8D1b13933C823DF434595BFBCfDB
OneStepProverHostIo	0x435570f523670d603946131A6A7444E48dB97163
OneStepProofEntry	0x2B4cE145fC38e0927f2736b1D5E95c53969f0519
ChallengeManager	0xfbc8bC77DE05BEA86914F2dAF871da250Effa9c7
RollupAdminLogic	0x5cb012C74eEDDe07d9A83cDf58fE056B9849cdE4
RollupUserLogic	0xcEc9aB9e49302aC80D86F60Ce985ce95904EA76a
UpgradeExecutor	0x54c562a3eeaBAb576c41bdD9Da9378480Ed5d851
RollupCreator	0xbCe8253fdB570Aa720EEdAB36ffa80E9b0c79A3D
DeployHelper	0x71DFd511e3485E9D43965FeCaE23BAF9886192fa

All deployed at block number: 130502855

VRF Core

• Random Testnet: 0x9bF90104DC52b645038780f5e4410eC036DD273d

VFR Request

• Arbitrum Sepolia: 0x008635105b348396B6ccD18BB715A9b6Db0E0D12
• Ethereum Sepolia: 0xa6334941d20b76af46379606a80F73a9c1406586
• Optimism Sepolia: 0xa6334941d20b76af46379606a80F73a9c1406586

VRF Verification Library

• Random Testnet: 0x90C95CD5980001b55EE0e54845d0daa9dA93d64E
• Arbitrum Sepolia: 0xAB6729F68CECD58D718693d98108AaaE0bf72b2A
• Ethereum Sepolia: 0x8368725aA2F7e8651b1CBa63a5d701ab72f5D429
• Optimism Sepolia: 0x8368725aA2F7e8651b1CBa63a5d701ab72f5D429

Hyperlane Deployments

Contract	Address
staticMerkleRootMultisigIsmFactory	0x6C19EF91b1b667564061cAf2deAeCCec1cb21528
staticMessageIdMultisigIsmFactory	0xd4Ab8cE19F14B568F427ABcF6a6732BaB21d1F53
staticAggregationIsmFactory	0x2232Ac960039A7bd28B2e7f90DEd13D07c2c2431
staticAggregationHookFactory	0x4A287617018DB41c1B1842039ecd5146f3968fCb
domainRoutingIsmFactory	0xC8e22f7975709324dC33d7De3485C4D0ca3BD73f
staticMerkleRootWeightedMultisigIsmFactory	0xf7323B5B7C787e8b2ADd02541C5275C8d39FD4B8
staticMessageIdWeightedMultisigIsmFactory	0x68bb78F5c7e46829352A2Dc5a81d99b7BE9C38ed
proxyAdmin	0x27E0Df343B726a12A865C2fB6811ED43417Db3Db
mailbox	0xbE431E0aaEFeC6Ce80071498bCbEd0452011DC41
interchainAccountRouter	0xa32b75c9fDa860C4aafd0DA3Bb6139a0c0a90621
interchainAccountIsm	0xa057712A9f509d8af15979836e300e32FE4da7EA
validatorAnnounce	0x3572108CF85Bb29f20B429028008F672ac76E86A
testRecipient	0x8af0Bbb1a7399C17143f825aa4A3109224f4dE4E
merkleTreeHook	0x88b6F46847461F11831E4f527Cd9cd96a09f842C

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

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Built for the Espresso Network Hackathon 2025