Randomness You Can Verify

OpenRNG transforms randomness from a disposable value into a verifiable digital object — with source provenance, confidence scoring, and cryptographic proofs.

Get Started 📄 API Docs 🔍 Verify a VEO

Terminal

      $ curl https://api.openrng.io/api/v1/entropy

      {

        "entropy": "c9bfe895cf2a343c...",

        "source": "vdf_epoch",

        "epoch": 248706,

        "veo_class": "VEO-1A",

        "verify_url": "/api/v1/verify/f262..."

      }

Traditional RNG


        → 0x8f3a...


        // That's it. Trust me, it's random.

OpenRNG — Verifiable Entropy Object

        → entropy: "0x8f3a..."

          sources: [drand, bitcoin, polygon]

          confidence: { score: 871, grade: "AA" }

          proof: { signature: "0x...", verified: ✓ }

          anchor: { chain: "polygon", tx: "0x..." }

Why OpenRNG

🔐

Verifiable

Every entropy object carries source provenance, cryptographic signature, and optional blockchain anchor. Verify any VEO without trusting the provider.

📊

Quantified

Entropy Confidence Score (ECS) measures quality across six dimensions — freshness, diversity, independence, manipulation resistance, and more.

⛓️

Anchored

For maximum trust, entropy is anchored to Polygon smart contracts. Anyone can read the contract and confirm the entropy existed at a specific block.

Entropy Confidence Score

Every VEO includes an ECS — a quantitative measure of entropy quality.

Grade	Score	Use Case
AAA	900–1000	Casino, regulatory, enterprise
AA	800–899	AI agents, gaming, finance
A	700–799	Simulation, testing

Start verifying your entropy

No API key needed for basic entropy. Full access available for teams.

Try the API → ⭐ GitHub 🎲 Live Demo