AFTRMRKT Integrates Chainlink VRF to Fairly Distribute Rare NFTs From Card Packs

We’re excited to announce that AFTRMRKT — a cyberpunk NFT card collection — has integrated Chainlink Verifiable Random Function (VRF) on Ethereum mainnet. By integrating the industry-leading decentralized oracle network, we now have access to a tamper-proof and auditable source of randomness needed to provide verifiable randomness distributed across 3 different tiered card packs with varying rarities for each pack. Ultimately this creates a more exciting, transparent, and fraud-proof user experience, as users can have confidence that the card packs will be distributed using provably fair randomness.

AFTRMRKT is a cyberpunk NFT card collection with a variety of ways to collect to win rewards and prizes. Season 1 has 30 cards in total and is composed of five categories: Core, Heavy, Gear, Weapon, and Ride. Each type also has varying rarities consisting of Common, Fresh, Rare, and Elite cards. Collect the complete set or any subset (called Supersets) from the rarities class or the categories class to win special card drop prizes as well as the Limited Edition and Standard Edition Artbook.

In order to provide 3 different tiered card packs with varying rarities in each, we need access to a secure random number generator (RNG) that any user could independently audit. However, RNG solutions for smart contracts require several security considerations to prevent manipulation and ensure system integrity. For instance, RNG solutions derived from blockchain data like block hashes can be exploited by miners/validators, while off-chain RNG solutions derived from off-chain APIs are opaque and don’t provide users with definitive proof about the integrity of the process.

After reviewing various solutions, we selected Chainlink VRF because it’s based on cutting-edge academic research, supported by a time-tested oracle network, and secured through the generation and on-chain verification of cryptographic proofs that prove the integrity of each random number supplied to smart contracts.

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 AFTRMRKT 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 provides our users with automated and verifiable assurances directly on-chain that AFTRMRKT is provably fair and was not tampered with by the oracle, outside entities, or the AFTRMRKT team.

“Chainlink VRF is the go-to solution from speaking to many other NFT project creators doing card packs. We’re excited to bring our users the industry standard solution for ensuring fair randomness in NFT card packs.” — Brian Sum, creator of AFTRMRKT

About Chainlink

Chainlink is the industry standard for building, accessing, and selling oracle services needed to power hybrid smart contracts on any blockchain. Chainlink oracle networks provide smart contracts with a way to reliably connect to any external API and leverage secure off-chain computations for enabling feature-rich applications. Chainlink currently secures tens of billions of dollars across DeFi, insurance, gaming, and other major industries, and offers global enterprises and leading data providers a universal gateway to all blockchains.

Learn more about Chainlink by visiting or reading the developer documentation at To discuss an integration, reach out to an expert.


AFTRMRKT is the brainchild of Brian Sum, a concept artist with 18+ years experience in the film and games industry. Each card is meticulously hand-drawn and has been over 7 years in the making.




AFTRMRK is a cyberpunk NFT card collection of hand drawn mech designs by Brian Sum

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AFTRMRK is a cyberpunk NFT card collection of hand drawn mech designs by Brian Sum

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