VRF

Quick take: VRF

Provably fair > Probably fair VF provides a transparent source of randomness to the blockchain space. VRF is a highly secure and provably fair source of on-chain randomness for all kinds of blockchain-based applications, NFTs, and games.

Supported chains

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In depth

Chainlink VRF works by combining block data that is still unknown when the request is made with the oracle node’s pre-committed private key to generate both a random number and a cryptographic proof. The smart contract will only accept the random number input if it has a valid cryptographic proof, and the cryptographic proof can only be generated if the VRF process is tamper-proof. This helps provide users with automated and publicly verifiable proof directly on-chain that each application using Chainlink VRF for randomness is provably fair and cannot be tampered with or predicted by the oracle, outside entities, or development teams.

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Release info

• VRF v2. Chainlink VRF v2 offers a new and improved version of the industry-standard on-chain RNG solution, making it easier to configure and scale randomness requests at a significantly reduced cost.
• VRF v1

Timeline

• 28 Apr 21. VRF goes live on Binance smart chain (BNB) mainnet. Read the announcement HERE.

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• 23 Feb 21. VRF goes live on Polygon. Read the announcement HERE.

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• 22 Oct 20. VRF goes live on Ethereum mainnet. Read the announcement HERE.

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VRF resources

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Timeline

Date	Media	Author	Title
09 Jun 22	Article	Avalanche	Chainlink Keepers and Chainlink VRF Go Live on Avalanche
28 Apr 21	BNB	Article	Chainlink VRF is Live on Binance Smart Chain, Bringing Verifiable Randomness to BSC Developers
23 Feb 21	Article	Polygon	Chainlink VRF Is Live on Polygon, Providing Developers With a Secure Source of Verifiable Randomness
22 Oct 20	Article	Chainlink	Chainlink VRF Now Live on Ethereum Mainnet

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Educational

Date	Media	Author	Title
N/A	Official Docs	Chainlink	Introduction to Chainlink VRF
N/A	Official Docs	Chainlink	Introduction to Chainlink VRF (v1)
N/A	Official Docs	Chainlink	Homepage: Verifiable source of randomness for smart contract developers
N/A	Official Docs	Chainlink	VRF: Contract Addresses
N/A	Tutorial	Figment.io	Using the Chainlink Oracle for Randomness on Polygon
05 Sep 22	Article	Chainlink	A Provably Fair RNG for Web2
17 Jun 22	Article	Chainlink	Why True Randomness Is Important in Web3
16 Feb 22	Video	Chainlink	What Is Chainlink VRF?
22 Sep 21	Article	Chainlink	35+ Blockchain RNG Use Cases Enabled by Chainlink VRF
18 Mar 21	Video	Chainlink	Getting A Random Number with Chainlink VRF | Chainlink Engineering Tutorials
15 Aug 20	Article	Chainlink	How to Build a Blockchain Lottery - using VRF
01 Jun 20	Article	Patrick Collins	How to Generate Truly Random Numbers in Solidity and Blockchain
12 May 20	Article	Chainlink	Chainlink VRF: On-chain Verifiable Randomness

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