Provably fair infrastructure

Every draw. Verified fair.
In public.

Every prize competition on the ABOS network is cryptographically sealed before it opens and re-derived from public randomness after it closes. If an operator tries to manipulate a draw, this board turns red for the whole world to see.

Network status: all draws fair

See the live register Verify a draw yourself How it works
2026Register opens
4Checks per competition
0Trust required
100%Independently recomputable
Live register

Four ticks on every comp

Each competition is sealed on four points: its setup, its instant-win allocation, its entry list and its draw. All four ticked means nothing was touched after lock-in. Edit a comp, reshuffle the instant wins or announce the wrong winner, and the tick turns red: public, permanent and automatic.

Contacting member sites…
Every proof below is recomputed live. Nothing showing? JavaScript may be off, so see Bullpen's proofs directly.

The register proves draw integrity: that the winner is fair and can't be rigged. Prize fulfilment (that the operator actually pays out) is tracked separately, through verified-winner confirmations and a public dispute log for each site.

The mechanism

Four steps. No trust required.

This isn't a promise or a certificate. It's maths anyone can recompute. Because ABOS hosts every member site, reporting to this register is automatic and mandatory, not voluntary.

Same proof, two depths. Pick yours.

The glass safe

Before a single ticket goes on sale, the draw's secret is locked in a glass safe and the safe's fingerprint is published for anyone to screenshot. From then on, nothing inside can change without the fingerprint breaking, in public.

A coin-toss from the future

The winner isn't picked by us, the site owner or anyone pressing a button. It comes from a public coin-toss service used worldwide, and the toss the draw uses doesn't exist yet while tickets are selling. Nobody can peek at a number that hasn't been made.

Check it yourself

After the draw, the safe is opened in public. Your own phone can re-run the whole draw and land on the same winner. If even one ticket had moved, the numbers wouldn't line up, and everyone would see it.

Why it matters

The draw date can't quietly move. The prize map can't be shuffled. A mate can't be picked. The operator couldn't fix the draw even if they wanted to, and that is worth more than any "trust us" badge in the industry.

No account, no maths degree, no trust required. The proof page is public on every single draw.
Open a proof

Recompute any draw in your browser

commitment= sha256(serverSeed)
7f2a…c19e sealed 2026-07-06 09:14 UTC
beacon= drand round 4,192,880
randomness= a1b9…40e2 (fetched independently)
entries= 249 tickets · hash d4c8…9f1
winner= HMAC(seed, entries | round)
→ ticket#188 · Jordan P. (Manchester)

Verified: reveal matches commitment · winner reconciles

Example proof with sample data.

The four ticks, checked automatically

  • Setup: prizes, ticket cap and rules are unchanged since the sealed commitment. No editing a comp after it locks.
  • Instant wins: the winning-ticket map was fixed before sale and still matches the reveal. Allocation can't be reshuffled.
  • Entries: the sold-ticket list wasn't altered after close. Its hash matches the sealed set.
  • Draw: the winner is exactly the one derived from the public drand beacon. No cherry-picking.

Any single mismatch flips the site to Failed verification and writes it to the permanent log. There is no path to a quiet fix.

Append-only log · hash-chained · anchored publicly daily

#3410site3 · 2214Verifiedprev=a0f2… → self=bc71…
#3411site2 · 4821Verifiedprev=bc71… → self=e93a…
#3412site6 · 881Failedprev=e93a… → self=4d17…← immutable

Example log with sample data.

Check it yourself

See real proofs

Want your draws on the register?

Every competition site we host reports here automatically.

Start a project info@abosdigital.com