Noku Integrates Chainlink VRF to Help Randomly Distribute Daily Rewards To Crypto Heroes Players
3 min readJul 12, 2022


We’re excited to announce that Noku, a unique Web3 platform, has integrated Chainlink Verifiable Random Function (VRF) on Fantom mainnet. By integrating the industry-leading decentralized oracle network, we now have access to a tamper-proof and auditable source of randomness needed to help randomly distribute daily rewards in a trackable and verifiable way.

Crypto Heroes, the blockchain trading card game about cryptocurrencies, is constantly evolving. To give back to our loyal community, we decided to randomly distribute rewards to players in regular matches.

In order to randomly distribute rewards to players, we needed 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 Crypto Heroes 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 Crypto Heroes’ daily reward distribution was not tampered with by the oracle, outside entities, or the Noku team.

“We strongly believe that transparency and fairness are two central tenets of the blockchain space, so integrating Chainlink VRF was an obvious decision. We look forward to exploring more ways to integrate Chainlink trust-minmized services in the future.” — Roberto Gorini, CEO of Noku

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.

About Noku

Noku ( is a web3 platform dedicated to the NFT world with its own blockchain.
Crypto Heroes ( is the first play-to-earn game developed on the Nokuchain: it’s a trading card game where your results are related to the performance of the cryptocurrencies you chose in a specific match.
Heroes: Genesis ( is the first official PFP collection on our platform through the NPFS PROTOCOL (Noku-Planetary-File-System)
The architecture developed by Noku for ERC 721-N allows metadata to be shared across multiple chains but having unique data for all of them, through the NPFS protocol. This is to prevent dissimilarity of data across chains.

After the release of our PFP collection (mid-July) many other features will be implemented: staking, a dedicated play-to-earn metaverse, many reserved tournaments for PFP owners with unique prizes and a new play-to-earn expected to come in Q3!



Play with cryptos at airdrop to all the accounts coming soon…