Certified draw
Randomness nobody controls, not even us
The randomness of your draw does not come from our servers. It comes from a public source, chosen before it even exists, and the draw is time-stamped by a European trust provider. Neither you, nor GoTombola, nor anyone else can pick the winners.
- Verifiable by anyoneThe draw can be redone identically, in the browser, with no account.
- Qualified time stampDated by a European trust service provider, under the eIDAS regulation.
- Sealed for five yearsThe result is kept and can be neither changed nor deleted.
"The computer picked it" no longer reassures anyone
It only takes one participant who sees the same name come up twice, or a winner close to the board, for doubt to set in. And faced with that doubt, answering "the software chose" is not enough: who guarantees the software was not steered?
GoTombola made this question a design principle. Our draw does not ask anyone to take our word for it: it proves itself. And anyone can check that proof, without asking our permission.
How a draw proves itself
There is nothing more for you to do: every draw run from your interface follows these steps.
Step 1
Tickets and prizes are locked
When the draw starts, the platform locks the list of tickets in play and of prizes, and commits to that list. Nothing can be added or removed any more.
Step 2
A trust provider time-stamps that commitment
The commitment receives a qualified electronic time stamp, issued by a European trust service provider recognised under the eIDAS regulation. It proves when the draw was committed, and that nothing has changed since.
Step 3
Randomness comes next, from a public source
The randomness comes from a public beacon of random numbers, produced jointly by independent universities and companies around the world. We commit in advance to a future number that nobody can know or influence yet.
Step 4
The result is sealed
Each result is signed as soon as it exists, then kept for five years where nobody can change or delete it. Running a draw again gives exactly the same winners: no "trying your luck again".
Step 5
Anyone can check
With the draw file, a participant, a partner or a court officer redoes the draw identically on verify.gotombola.co, in their own browser, without uploading anything.
The proof is public
The method is documented, the verifier is free software anyone can download, and it checks four things every time.
- The winners really follow from the tickets and the randomness.
- The randomness is genuine.
- The time stamp is qualified.
- The result has not been changed.
Good to know
- Every draw run from your management interface is certified, in every country and whatever your offer. There is nothing to switch on.
- The proof we keep holds no personal data: no name, no e-mail, no phone number. Participants only appear as ticket identifiers.
- Your rules still apply: if your rules say one prize per person, the draw applies it by itself.
- After the draw, you download the draw file from "Event day", to keep it or hand it to whoever you like.
Your questions
No. Every draw run from your management interface follows these steps automatically.
No. The randomness does not come from our servers, it is chosen before it exists, and the commitment to your tickets is time-stamped by a trust provider before that randomness is known. The result is then sealed: even our administrators cannot change it.
It is an electronic date issued by a European trust service provider listed on the European Union's official trusted lists. It proves when a document existed, and that it has not changed since.
Yes. Give them the draw file: they drop it on verify.gotombola.co and the verifier redoes the draw identically, without sending anything to anyone.
No. The proof only holds ticket identifiers, never a name, an e-mail or a phone number.
A draw you can show to everyone
To your board, to the town hall, to your partners and to every participant.