A giveaway picker you can prove was fair.

Why "provably fair" matters

Followers are right to be sceptical of giveaways: most "random pickers" just show a result on the organiser's screen, and there's no way to know how many times they clicked. A flipj draw is different: it's recorded publicly and decided by randomness that didn't exist when you entered the names.

How a draw is decided

1. Commit. When you lock in the entrants, flipj stores the list and its SHA-256 fingerprint, and picks a future round of drand, a public randomness beacon run by the League of Entropy (universities and companies including Cloudflare and EPFL).
2. Reveal. About 30 seconds later, drand publishes a random value for that round, signed by the whole network. Nobody can predict it in advance.
3. Draw. The winners come from that value combined with the list's fingerprint, using a published algorithm. Anyone can re-run it in their browser from the certificate page and get the same winners.

Tips for a smooth giveaway

• Post the certificate link before the countdown ends, so followers can see the draw was created before the result was known.
• Export or copy entrants from comments, a form or a spreadsheet, one per line. Use "remove duplicates" if each person may only enter once.
• Pick one or two reserves in case a winner doesn't reply.
• Tick "hide names" if your entrants' names shouldn't be public. The fingerprint still proves the list didn't change.