Parallel Is Integrating Chainlink VRF for Fair Randomness in Distributing Pack Drops

Parallel Life
Published in
3 min readOct 25, 2021


We’re excited to announce that Parallel — a science-fiction NFT collectible card game — is integrating Chainlink Verifiable Random Function (VRF) on Ethereum. By integrating the industry-leading decentralized oracle network, we will have access to a tamper-proof and auditable source of randomness needed to randomly select which users are allocated card packs in upcoming drops. Through Chainlink VRF, we can help ensure that all participants have an equal access to the most sought after packs that contain the rarest cards in the drop.

Parallel is a sci-fi card game involving NFTs. The Parallel game is composed of digital collectible cards that can be used to build a deck of cards and played in an online/mobile game currently in development. Players will need to collect a minimum set of cards to compose a playable deck that is associated with one of the five Parallels — Earthen, Marcolian, Augencore, Kathari, and Shroud. Players can create more than one deck of cards, and play as any of the Parallels for each match.

Our next two pack drops are scheduled for October and January, and Chainlink VRF plays a key role in establishing an allocation process that is secure and provably fair end-to-end. In order to help ensure complete fairness, we need access to a secure random number generator (RNG) that any user could independently audit.

After reviewing various solutions, we chose to integrate Chainlink VRF — an RNG solution that is purpose-built for smart contract applications. 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. Parallel’s smart contracts 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 players with automated and publicly verifiable proof directly on-chain that the randomness produced is unbiased and was not tampered with or predicted by the oracle, outside entities, or the Parallel team.

“Leveraging Chainlink VRF to secure the distribution of cards is crucial to helping ensure that nobody can manipulate the NFT distribution process, meaning all eligible participants have an equal chance of obtaining new cards of varying rarity,” stated Kalos, Project Director at Parallel. “This integration is perfect for increasing transparency and fairness into the distribution of our collection, and we are also actively exploring other potential applications of Chainlink VRF for in-game mechanics that require verifiable randomness.”

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 read the documentation at To discuss an integration, reach out to an expert.

About Parallel

Parallel is a Sci-Fi digital collectible card game being built on the Ethereum blockchain. Players build decks out of cards from their collection and face off head to head in strategic combat.

Five isolated civilizations of humans — evolved in parallel and spread across the vastness of space — return to Earth after thousands of years to harness a new source of immense energy their ancestral planet now possesses. Coming face to face for the first time since the catastrophic Exodus of Earth, they each claim their sole right for dominion. Their right… as humans. Conflict is inevitable, and the outcome is still unknown.