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Powering Fair Randomness on OPN Chain: Band VRF is Now Live on IOPn

Powering Fair Randomness on OPN Chain: Band VRF is Now Live on IOPn

Band is thrilled to announce the live mainnet deployment of Band VRF (Verifiable Random Function) on OPN Chain, the sovereign blockchain at the heart of the IOPn ecosystem. This integration brings cryptographically secure, publicly verifiable randomness to OPN Chain, giving developers and users on IOPn a foundation for fair, tamper-proof on-chain experiences.

Why Band VRF on OPN Chain?

IOPn is building the Internet of People: sovereign infrastructure where AI, blockchain, and digital identity converge to return ownership to users. At the center of that vision sits OPN Chain, a Cosmos SDK-based blockchain with full EVM compatibility that powers IOPn's ecosystem of products.

When you are building systems where trust is the product, even randomness has to be held to the same standard. Band VRF brings cryptographically secure, on-chain verifiable randomness to OPN Chain, solving a critical need for any application where the fairness of an outcome cannot simply be assumed. It has to be proven.

What Does Band VRF Do?

Band VRF provides secure, tamper-proof, and unpredictable randomness, which is essential for on-chain applications like lotteries, giveaways, NFT drops, and games. In all of these cases, the random outcome must be free from manipulation.

Band VRF achieves this by generating fresh randomness that is verifiable and completely independent of any application's internal state. Every result comes with a cryptographic proof that anyone can check on-chain. It is impossible to cheat, predict, or manipulate the outcome.

Band VRF on OPN Chain is:

  • Plug-and-Play: Minimal setup via Band VRF provider contracts, accessible through standard Solidity interfaces
  • Fully Verifiable: Every random output is backed by cryptographic proofs and Merkle inclusion, publicly auditable on-chain
  • Scalable: Built for high-volume requests across lotteries, giveaways, NFT mechanics, and more

Verifiable Fairness for IOPn's On-Chain Lottery

IOPn is now using Band VRF to power its on-chain lottery and giveaway mechanics. Every draw is executed on-chain, and every outcome comes with a verifiable proof. Participants do not have to trust that the selection was fair. They can verify it themselves.

This is what trustless randomness looks like in practice: no black boxes, no off-chain draws, no admin-controlled seeds. Just a cryptographic proof, on-chain, for anyone to check.

Get Started

Developers building on OPN Chain can integrate Band VRF today using the manual coupled with the addresses below.

git clone https://github.com/bandprotocol/vrf-worker-v1.git
cd vrf-worker-v1
cp config.yaml.example config.yaml

  • Bridge: 0xdca381D661D22274b58A47fdA3A02Ad84431526b
  • VRFProvider: 0x3d29B6f57Cf8ee7fbED5b24201C91915c7468504
  • VRFLensV2: 0xdc994dCCaA393D63764774e4Ef6e0819E2E00fEF
  • Band VRF Docs: https://docs.bandchain.org/verifiable-random-function/introduction
  • OPN Chain Developer Docs: https://iopn.gitbook.io/iopn/developer-docs
  • Join Band Discord: https://discord.com/invite/3t4bsY7
  • Contact: bd@bandprotocol.com

Looking Ahead

As the IOPn ecosystem grows, Band remains committed to expanding its data infrastructure across OPN Chain. Band VRF is live today, and the integration of Band Price Feeds is being explored, which would bring real-time, reliable price data to DeFi applications, RWA protocols, and AI-powered products being built on IOPn.

For the new wave of developers arriving on OPN Chain, Band provides the full data layer: verifiable randomness, real-world price feeds, and battle-tested infrastructure that scales with your application. With further convergence in AI ahead, the foundation being built here extends well beyond randomness.

Build on OPN Chain with Band. Every outcome provably fair, every data point trustless.

About IOPn

IOPn stewards the Internet of People, a sovereign ecosystem built around digital identity, AI infrastructure (Siada), and on-chain ownership. At its core is OPN Chain, a Cosmos SDK-based Layer 1 with full EVM compatibility, designed for identity, AI workloads, and real-world assets.

Learn more: https://iopn.io

About Band

Band is the data layer that trains AI engines and powers blockchain applications. By empowering DeFi, GameFi, and AI agents, it enables developers, institutions, and users to access real-time data with zero counterparty risk.

With Band's open, battle-tested data infrastructure built for blockchains and LLMs, it ensures that real-time information is always accessible, fueling everything from financial protocols to autonomous AI systems. 

More about Band: https://linktr.ee/bandprotocol