Provably Fair Draws
Every draw on Compo's is cryptographically verified. You can check the results yourself on any third party SHA-256 tool.
11
Total Verified Draws
1
Provably Fair Draws
100%
Draws With Certificate
🛡️ How It Works
Every draw produces a cryptographic certificate.
For Provably Fair draws, three independent sources of randomness are combined into one so nobody can control the outcome.
1👥
Community Entropy
Every player who buys a ticket contributes unique random data.
These live data points are mixed together into a single hash that nobody can un-mix or predict. Your entry makes a difference!
These live data points are mixed together into a single hash that nobody can un-mix or predict. Your entry makes a difference!
2⛓️
Bitcoin Blockchain
We use the most recent Bitcoin block hash which is a publicly verifiable number generated by the entire Bitcoin network.
Anyone can check it on a third party block explorer.
Anyone can check it on a third party block explorer.
3🔐
Pre-Committed Server Seed
Before the draw, we generate a secret seed and publish its SHA-256 hash on the competition entry page.
After the draw, we reveal the full seed, proving we didn't change it.
After the draw, we reveal the full seed, proving we didn't change it.
4📊
SHA-256 Combination
All three sources are joined and hashed with SHA-256. The first 8 hex characters determine the winner index. We also use
random_bytes() and crypto.getRandomValues() and not predictable functions like rand().🔍 Verify A Draw
Enter a certificate hash or competition ID to look up and verify any draw. We'll re-run the calculation and confirm it matches.
🎫 Verify If Your Ticket Currently Is, Or Was Previously In A Draw
Enter a competition ID and your ticket number. We'll use a Merkle proof to confirm your ticket is currently, or was included — without revealing anyone else's tickets.
📜 Recent Verified Draws
The latest draws with their verification status.
🃏
Win £500 Cash #2
🃏
Win £500 Cash #2
🎰
£3,000 Cash
🎰
£250 Cash
🎰
Lifestyle 1
🎰
£25 Cash
🎰
£50 Cash
🎰
£1,000 Cash
🎰
£250 Compo Coin Draw
🎰
£50,000 Cash