Certification
A draw you can verify
- 1
Before the game, the fingerprint
We choose a secret key and publish its SHA-256 fingerprint on the game page. The fingerprint does not reveal the key, but it locks it: changing it later would be visible to everyone.
- 2
After the game, the reveal
When the game closes, we publish the key. The winning number is calculated from the key and the game identifier, within the range stated in the terms.
- 3
Anyone can check
You check that the key matches the fingerprint published at the start, then you recalculate the number. The calculation runs in your browser; nothing is sent to us.
Certification plans
Running your prize draw is included in every plan. Price per prize draw, excluding VAT.
Free
£0
per prize draw
Up to 1,000 entrants
With the ‘Certified by Luck For Good’ badge on your prize draw
Starter
£9
per prize draw
Up to 10,000 entrants
For creators and independent businesses
Pro
£29
per prize draw
Up to 100,000 entrants
For brands and large communities
Unlimited
£99
per prize draw
Over 100,000 entrants
For national campaigns
Agencies
Unlimited certified prize draws for all your clients, subject to fair use.
£49 per month
In every plan
- Draw fingerprint published before the prize draw and timestamped on a public blockchain
- Public verification page open to everyone
- Full prize draw management and AI-drafted terms
- Draw report
Certification proves the technical fairness of the draw. It is not a substitute for a report by an independent adjudicator or court officer.
Verify a draw
The fields are prefilled with the demo game. Replace the values with those published on your game page.
Ready to launch a certified game?
Every Luck For Good game is certified this way, at no extra cost. Explore the formats and pricing.