Certification
A draw you can verify
- 1
Before the contest, the fingerprint
We choose a secret key and publish its SHA-256 fingerprint on the contest page. The fingerprint does not reveal the key, but it locks it in: changing it later would be visible to everyone.
- 2
After the contest, the reveal
When the contest closes, we publish the key. The winning number is calculated from the key and the contest identifier, within the range stated in the 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 contest is included in every plan. Price per contest, before taxes.
Free
$0
per contest
Up to 1,000 entrants
With the “Certified by Luck For Good” badge on your contest
Starter
$9
per contest
Up to 10,000 entrants
For creators and local businesses
Pro
$29
per contest
Up to 100,000 entrants
For brands and large communities
Unlimited
$99
per contest
Over 100,000 entrants
For national campaigns
Agencies
Unlimited certified contests for all your clients, subject to fair use.
$49 per month
In every plan
- Draw fingerprint published before the contest and timestamped on a public blockchain
- Public verification page open to everyone
- Full contest management and AI-drafted contest rules
- Draw report
Certification proves the technical fairness of the draw. It is not a substitute for a report by a notary or an independent contest administrator.
Verify a draw
The fields are prefilled with the demo contest. Replace the values with those published on your contest page.
Ready to launch a certified contest?
Every Luck For Good contest is certified this way, at no extra cost. Explore the formats and pricing.