Thread by @ChainLinkGod

1/ #Chainlink VRF v2 is now live on mainnet, serving as an upgrade for the ecosystem’s most widely adopted verifiable randomness solution

The result? Five significant improvements in cost-efficiency and configurability

Let’s break it down 🧵👇

2/ For context, Chainlink Verifiable Random Function (VRF) is a secure random number generator (RNG) purpose-built for smart contract applications

Each RNG value is backed by a cryptographic proof that is verified on-chain, preventing manipulation from oracles, users, and miners

3/ Since its release, Chainlink VRF v1 has fulfilled over 3M requests for randomness and now serves over 2,300 smart contracts across multiple blockchains

Use cases include:
- Fair NFT minting
- Loot box drops
- Lotteries/raffles
- On-chain gaming dApps

Now onto the upgrades

4/ Pay-As-You-Go At Scale:

VRF v2 introduces a subscription management contract that allows smart contracts to pre-fund multiple requests using a single $LINK balance, rather than transferring $LINK each time

This reduces the gas costs of VRF requests by up to 60% 🤯

5/ Furthermore, with this new subscription contract, VRF requests are no longer priced in static amounts of $LINK

Rather, the amount of $LINK paid scales depending on the gas costs of the fulfillment transaction plus a static fee on-top (similar to the Keepers billing model)

7/ Variable Callback Gas Limit:

Users can now adjust how much gas is spent when a VRF response is delivered, allowing for more complex logic in the same transaction as the RNG value is received

Critical tasks using RNG can be completed right away, even during network congestion

8/ This parameter can now be set to a maximum of 2M gas on Ethereum, which is 10x higher than the previous limit!

This functionality is made possible by the subscription contract offering dynamic pricing based on gas consumed

This max parameter will vary by blockchain

9/ Custom Block Confirmations:

Users can can define how many block confirmations must pass since request before verifiable randomness is generated & delivered on-chain

This can range from a 3-block minimum to a 200-block maximum

In comparison v1 was fixed at 10 blocks on Eth

10/ Providing the ability to configure the block confirmation number allows users to strike their own balance between security (protection against chain re-orgs) and the latency of response

A safe value will vary on different chains
docs.chain.link/docs/vrf-secur…

11/ More Randomness Per Request:

An improved Coordinator contract allows users to request multiple random numbers in a single request transaction

The fulfillment of all of the RNG values is also delivered in a single transaction back to the user contract

12/ By batching request and delivery of RNG into singular transactions, significant gas cost savings is achieved (slightly akin to OCR for price feeds)

This is particularly useful for high frequency applications on blockchains with higher gas fees

13/ Unified Billing:

VRF v2 enables multiple smart contracts (up to a max of 100) to fund their RNG requests from a single $LINK subscription contract balance managed by the developer

14/ This allows developers who manage many contracts that each need randomness to reduce gas costs and simplify fund management for more complex use cases and situations

Now easier than ever to use VRF across many different dApps offered by the same developers

15/ The above five improvements introduced by #Chainlink VRF v2 provides developers access to even cheaper and more flexible randomness

All while retaining the same security properties that make VRF so useful and versatile for dApps

16/ Learn more about the #Chainlink VRF v2 release in the release blog post below
blog.chain.link/vrf-v2-mainnet…