BlockRand

Provably fair, deterministic randomness for games, casinos, lotteries, simulations and apps — built on public drand entropy, delivered as a single, verifiable API call.

Total Commit-Reveal-Drand Rounds: ...

Last Sync: ...

Status: Checking...

What Is BlockRand?

BlockRand is a randomness infrastructure that gives developers cryptographically verifiable random outcomes without trusting servers, hiding logic, or forcing players to wait.

Every result is derived from a public drand beacon and a transparent commit–reveal protocol, producing a single final seed from which all game outcomes are deterministically generated. See it in action LIVE here.

The Mental Model

1. Commit (Hidden by SDK)

The SDK automatically commits player intent and a server secret. Neither the developer nor the player needs to manage timing, delays, or cryptography.

2. Public Entropy (drand)

A future drand round — unknown to all parties at commit time — acts as neutral, publicly verifiable entropy.

3. Reveal Once, Derive Everything

When revealed, a single 256-bit seed is produced. All outcomes (dice, cards, shuffles, picks) are derived deterministically from this seed.

➜ The reveal returns all standard results at once, plus full proofs, formulas, counters, timings and verification URLs. Nothing is hidden.

What You Get in One Call

🎲 Dice rolls (d6, d10, d100)
🪙 Coin tosses & percentage chances
🃏 Full card draws & shuffled decks
🎯 Picks, samples, weighted drops
🔁 Deterministic replay from the same seed
🔍 Public verification of every step

No configuration required. Covers 95%+ of real-world game logic out of the box.

Why Developers Use BlockRand

✅ Provably fair & auditable by players
✅ Fully deterministic & replayable
✅ No client-side crypto or timing logic
✅ Works on web, mobile & backend systems
✅ No smart contracts or gas costs
✅ Open-source SDK, transparent math

Pricing

BlockRand is designed to grow with you.

Free Forever

Up to 100 active players / month

Ideal for indie games, experiments and early launches. No credit card required.

Open-source SDK
All verification features included
Real production usage

Pay only when your game succeeds.

Growth

$29 / month – up to 500 MAU

$49 / month – up to 1,000 MAU

$199 / month – up to 10,000 MAU

Scale

Higher volume, white-labeling or custom needs?
Contact us.

➜ An active player is any unique player making at least one commitment in a calendar month.

Getting Started

1. Visit Blockrand Open Source GitHub to get your API key via curl
2. Call getRandom() for verifiable results

Documentation, SDKs and verification examples are available on GitHub.

Randomness Players Can Verify

Build trust into your game from day one.

View Open Source SDK on GitHub

Docs on Fair Randomness