Fair draws · LESSON 3
Unipicker's draw-ledger — proof by record
Unipicker records every draw. The moment a draw starts, the draw materials (entrant info · draw settings) get sealed with a hash code, and the DRAND Round info to be used for the draw seed is posted to the ledger in advance. Once the draw ends, you can check the DRAND number and the draw's random seed.
Draw start = seal — The moment a draw starts, the entrant info and draw settings get sealed with a hash code. And the DRAND Round to be used for the seed is also posted to the ledger in advance. After sealing, secretly changing the data makes the hash differ and get caught instantly, and since the DRAND round is already public, the organizer can't know or pick the result in advance. In short, the draw materials get locked into an "unchangeable state" the moment the draw starts.
Policy
What is the draw-ledger?
The draw-ledger is a policy of publishing a host's draw history to stop them from repeating a draw until they get the result they want.
Join and get a dedicated ledger pageJoin the ledger and a member's own draw-history page is created; on each completed draw, the record is registered automatically.
Prevent repeat draws on one accountThe ledger can stop secret repeat draws on a single account.
Must disclose the URL at announcementLedger members must share the draw-history page URL with entrants when announcing results.
Because the history is public, "redraw until you like the result" is impossible — every attempt stays on the record.
Monitoring
Anti-fraud draw monitoring system
Unipicker runs an anti-fraud draw monitoring system for a fair draw. It automatically detects patterns like repeating similar draws or running a draw with fraudulent intent.
If the system detects a "fraudulent draw", use of the draw-ledger service is suspended, and you can no longer run ledger-registered draws.
Draw ledger
Explore the draw ledger
Standard draw-ledger example
100th anniversary prize winner draw
Entries201,448Winner100
Manager-run draw-ledger example
CERT-UNIyU4Jk5CnRun by Unipicker on behalf of the host2026 HealCamp Global Lucky Draw
Entries264Winner10
Draw manager
Suny Choi
The seed info records the DRAND round · entrant-info file hash · draw-settings file hash · DRAND number · draw seed. Tap the items above to check.
Note — Unipicker uses DRAND first, NIST if DRAND fails, and Unipicker random if NIST fails too. Depending on which source was used, the items above may differ (e.g. NIST Pulse Index instead of DRAND Round).
With just this record, anyone can hash the list to compare with the seal, and recompute using that DRAND round value to verify the winners.
Draw seed info
Drand Round (22:25 KST round +2 · quicknet)
#30871567
Entrant-info file hash
d6d420c501ea23db776f362695aef07b804051369780a4445c7210030544a494
Drand Chain Hash
52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971
DRAND number
637d81dad5c911abadbcb6fd1bfb51ac46c43e2e275609825a76d05934a4b2d6
Draw seed (first 16 hex of DRAND → decimal)
7169028958733275563
Draw seed info
Drand Round (22:58 KST round +2 · quicknet)
#30872233
Entry Info File Hashcode
714fefaf062f2103dae7c8e4f517b974ed529e1dc7125d51e1ffeb386da9e502
Draw Info File Hashcode
abf6aa8025d3ef796c13a559d3002114c72da746c40275a4dfd86d19c63aa699
Drand Chain Hash
52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971
Drand Random
bfe24f540395c86fa4ca1fe1c4163a9130abbc9c0430a1745cd73baeac528745
Draw Random Seed (first 16 hex of DRAND → decimal)
13826701028236839023