Provably fair casinos, and what the check covers

Reading the list

How the seed and the hash work together

Betfury documents the mechanism most plainly. Each outcome comes from a server seed, a client seed and a nonce; the server seed is a random string of 64 characters, its hash is handed to you before the bet, and the pair can be checked afterwards on a fairness page. Winna runs the same shape with the player invited to contribute the client half, combining the two, hashing them and revealing the server seed once the round has closed. Gamdom does something more unusual: a chain of ten million SHA-256 hashes is generated per game in advance and played through in reverse order, so any single result can be walked back to the head of the chain, and the verifier code is published for eleven of its games.

The limit that never appears on the banner

Count the covered games against the lobby and the badge shrinks fast. Gamdom advertises 8,200 titles from more than 60 providers and verifies 13 of them, its own. Betfury lists over 13,000 games from more than 70 studios and verifies the 22 in its Originals section. Shuffle claims more than 15,000 titles on the homepage while older metadata on the same site still says 6,000, and either way the verifier reaches only its own Crash, Plinko, Mines, Dice, Roulette, Blackjack, Tower and Chicken. Winna runs 39 providers and covers its own Originals. Third-party slots and live tables run on certified random number generators audited by a lab, which is a different promise entirely: someone tested the machine, and you take their word for it.

What the published return figures add

Verification proves a result was not altered; it says nothing about the edge. The operators that publish both are the interesting ones. Duel states its in-house games run at 99.9% with an explicit goal of reaching 100%, and describes its original slots as designed for full return. Shuffle publishes a range across its own titles, from 97.30% on roulette to 99.48% on blackjack with correct play. Betfury declares up to 99.28% and a minimum bet of 0.00000001 in any currency. Read those beside the verifier: the seed tells you the deal was honest, the return figure tells you what an honest deal costs.

All twenty

The whole roster, ranked by what is built in house

#	Casino	What the operator builds in house	Score	Open the casino
1	Stake	in-house original games, provably fair verification, sportsbook under the same account	8.4/10	Open
2	Winz	in-house original games, provably fair verification, sportsbook under the same account	8.4/10	Open
3	Betfury	in-house original games, provably fair verification, own token economy, sportsbook under the same account	8/10	Open
4	Gamdom	in-house original games, provably fair verification, sportsbook under the same account	8/10	Open
5	Shuffle	in-house original games, provably fair verification, own token economy, sportsbook under the same account	7.9/10	Open
6	Rollbit	in-house original games, provably fair verification, own token economy, sportsbook under the same account	7.6/10	Open
7	1win	in-house original games, sportsbook under the same account	7.4/10	Open
8	Fairspin	provably fair verification, own token economy, sportsbook under the same account	7.3/10	Open
9	BitStarz	provably fair verification	7.2/10	Open
10	Duel	in-house original games, provably fair verification	7.2/10	Open
11	Winna	in-house original games, provably fair verification, sportsbook under the same account	7.2/10	Open
12	1xSlots	sportsbook under the same account	7/10	Open
13	Roobet	in-house original games, provably fair verification, sportsbook under the same account	7/10	Open
14	Vavada	sportsbook under the same account	7/10	Open
15	Riobet	sportsbook under the same account	6.9/10	Open
16	Weiss	own token economy, sportsbook under the same account	6.6/10	Open
17	Spinbetter	sportsbook under the same account	6.5/10	Open
18	Vodka	sportsbook under the same account	6.5/10	Open
19	Casino-X	standard third-party lobby	6.4/10	Open
20	Play Fortuna	standard third-party lobby	6.4/10	Open

What people ask about verifying a round

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