VRF

How Paintswap VRF Works

Paintswap VRF (Verifiable Random Function) provides secure, provably fair random numbers for smart contracts on the Sonic blockchain. Unlike traditional RNG services, Paintswap VRF uses cryptography and Web3 using Sonic's distributed ledger to prove that the output was determined by the inputs that no one could have manipulated the results.

Thanks to Sonic's innovative Fee Monetization model, we provide secure random number generation with no additional costs beyond standard gas fees.

Comparison With Traditional Oracle Models

Feature	Traditional VRF	Paintswap VRF
Fee Structure	Gas fees + ERC20/native token fees	Gas fees only
Tokens Required	Must hold specific tokens	Just network gas token
Fulfillment Time	Multiple blocks/minutes	Sub-second response possible
Subscription Management	Complex subscription system	No subscriptions needed
Cost Predictability	Variable based on token prices	Predictable gas costs only

System Flow

1. Request Random Numbers

   Consumer contract calls requestRandomnessPayInNative() and calculates fee using the Paintswap VRF Coordinator contract.

2. Event Detection

   VRF Listener detects the RandomWordsRequested event and stores request details in a queue where they can be processed at Sonic speed.

3. Proof Generation

   A VRF Oracle worker generates a VRF proof using the oracle's private key and prepares the cryptographic verification parameters.

4. Fulfillment Submission

   Oracle submits the fulfillRandomWords() transaction to the Paintswap VRF contract with the request ID and VRF proof.

5. On-Chain Verification

   VRF contract verifies the proof, confirms it matches the commitment, and derives provable random word values.

6. Random Numbers Delivered

   Consumer's rawFulfillRandomWords() callback receives the verified random words and executes logic.

Technical Details

Smart Contract Architecture

• PaintswapVRFCoordinator: Core coordinator contract with UUPS upgradeability

• PaintswapVRFConsumer: Abstract base class for contracts requesting randomness

• VRF library: Implements cryptographic functions using Secp256k1 and SHA256

• Owner Controls: Oracle registration, fee management, parameter tuning

Oracle Worker System

• VRF Listener: Monitors blockchain events for randomness requests

• VRF Processor: Generates cryptographic proofs and submits transactions

• Queue: Maintains workers, request state, and status tracking

• Heartbeat System: Ensures oracle health with periodic checks

Security Properties

• Cryptographic Verification: Elliptic curve based VRF with on-chain validation

• Distributed Processing: Multiple oracles can process requests with locking mechanism

• Retry Mechanism: Handles temporary failures with backoff strategy

Integration Steps

1. Import PaintswapVRFConsumer base contract and inherit from it

2. Implement _fulfillRandomWords() callback

3. Store request context to match responses with requests

4. Request randomness by calling _requestRandomnessPayInNative()

5. Process delivered random words in your callback function

Network	Chain ID	VRF Coordinator
Sonic Mainnet	146	0x6E3efcB244e74Cb898A7961061fAA43C3cf79691
Blaze Testnet	57054	0x6E3efcB244e74Cb898A7961061fAA43C3cf79691

npm Package

https://www.npmjs.com/package/@paintswap/vrfwww.npmjs.com

Painswap VRF Portal

Paintswap VRF: Provable Randomnesspaint_Swap

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