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Native VRF (Built-in Randomness) Tutorials

Flow is a blockchain with built-in randomness, powered by its native VRF (Verifiable Random Function) capabilities. Unlike other blockchains that require external oracles, Flow's Random Beacon provides cryptographically secure randomness at the protocol level. This elimiates extra costs, reduces latency, and improves reliability for decentralized applications.

These tutorials cover how to implement secure randomness directly in both Cadence and Solidity smart contracts on Flow. Whether you build on Flow's native environment or Flow EVM, you can generate unbiased, verifiable random values without third-party dependencies.

Tutorials​

Secure Randomness with Commit-Reveal in Cadence​

Learn how to implement secure randomness in Cadence with Flow's commit-reveal scheme, which ensures fairness and resistance to manipulation.

VRF (Randomness) in Solidity​

Learn how to use Flow's native verifiable randomness in Consumer Decentralized Finance (DeFi) contracts on Flow EVM, which includes best practices, security considerations, and complete code examples.

Why Flow for randomness?​

  • Protocol-level randomness: no need for external oracles or APIs.

  • Lower costs: built-in randomness means no extra transaction fees.

  • Enhanced security: cryptographically secure and verifiable onchain.

  • Cross-language support: Wwrks seamlessly in both Cadence and Consumer DeFi.

  • Speed: Flow is a fast blockchain with the design goal of 1,000,000 transactions per second.

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