Certification

A drawing 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 in: 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 ID, within the range stated in the official rules.
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 giveaway is included in every plan. Price per game, excluding tax.

Free
$0
per game
Up to 1,000 entrants
With the "Certified by Luck For Good" badge on your game
Starter
$9
per game
Up to 10,000 entrants
For creators and local businesses
Pro
$29
per game
Up to 100,000 entrants
For brands and large communities
Unlimited
$99
per game
Over 100,000 entrants
For national campaigns

Agencies

Unlimited certified games for all your clients, subject to fair use.

$49 per month

In every plan

Drawing fingerprint published before the game and timestamped on a public blockchain
Public verification page open to everyone
Full giveaway management and AI-drafted official rules
Drawing report

Certification proves the technical fairness of the drawing. It is not a substitute for a legal notary or court officer's report.

The fields are prefilled with the demo game. Replace the values with the ones published on your game page.

Every Luck For Good game is certified this way, at no extra cost. Explore the formats and pricing.