Fairseal 🦭

Provably fair selections for games, loot boxes, and any randomized allocation.

Fairseal creates verifiable receipts (CSRs) proving that a selection was committed before the outcome was knowable. Every loot drop, gacha pull, and randomized selection — independently verifiable, trustlessly.

Try It Now

npx @fairseal/commit

One command. A verifiable gacha pull in your terminal. No setup.

Quick Start

npm install @fairseal/commit

import { createCommitment, resolveCommitment, createReceipt, verifyReceipt } from '@fairseal/commit';

// 1. Lock your loot table BEFORE the outcome is knowable
const commitment = createCommitment({
  rule: JSON.stringify(LOOT_TABLE),
  inputs: [playerId, pullNumber.toString()],
  revealAfter: 10,
});

// 2. Resolve with verifiable entropy from drand
const resolution = await resolveCommitment(commitment);

// 3. Your algorithm + verifiable entropy = provably fair drop
const drop = yourWeightedPull(LOOT_TABLE, resolution.beaconRandomness);

// 4. Package as a receipt anyone can verify
const receipt = createReceipt(commitment, resolution);
const proof = await verifyReceipt(receipt); // ✅ PARTIAL

How It Works

1. Commit — Lock your drop table + player ID into a hash before the randomness exists
2. Entropy — Wait for a public drand beacon round (Cloudflare + Protocol Labs)
3. Resolve — Derive the selection from beacon entropy + your committed rule
4. Verify — Anyone can re-run every step. BLS12-381 cryptographic verification. No trust required.

Performance

Client-side. No server. No account. No fees for PARTIAL verification.

Packages

Use Cases

Links

• 🌐 fairseal.io — Landing page
• 📦 npm @fairseal — All packages
• 🔍 verify.fairseal.io — Receipt verifier
• 📖 @fairseal/commit README — Full documentation

License

MIT — Fairseal