Crash predictors are fake: how crash games really work

Crash predictors promise to tell you when the multiplier will bust, so you can cash out just before. They are sold as apps, Telegram signals, browser extensions and "AI bots" for BC.Game, Stake, Roobet, Gamdom and Aviator-style games. None of them work. Crash results are fixed in advance by a cryptographic hash chain, and the next hash in that chain cannot be worked out from the ones before it.

How crash games decide the multiplier

Most crypto casino crash games, including BC.Game, Gamdom, Shuffle and Gamba, use a hash chain:

1. The casino generates a long chain of hashes in advance. It starts from a secret seed and hashes it with SHA-256, then hashes the result, and so on, often for millions of rounds.
2. The chain is played backwards. The last hash generated is used for the first round, the one before it for the second, and so on. The casino publishes the final hash before the game starts, so it is committed to the whole sequence.
3. Each round's multiplier is calculated from that round's hash. Some casinos also mix in a salt, such as a Bitcoin block hash that did not exist when the chain was made, so the casino itself could not pick a favourable chain.
4. After the round, its hash is shown. Anyone can hash it once and get the previous round's hash. That proves every round came from the same pre-committed chain.

At BC.Game, for example, the published method takes the first 13 hexadecimal characters of the round hash, turns them into a number X between 0 and 1, and sets the crash point at 99 divided by (1 minus X), with a 1% house edge.

Why prediction is impossible

To predict the next round, a tool would need the next hash in the chain. But the chain runs backwards: the next round's hash is the input that produces the current one. Going from the current hash to the next means reversing SHA-256, which nobody can do. If someone could, they would have far more valuable things to break than a crash game.

Past multipliers do not help either. Each round's hash is effectively random, so a run of low crashes does not make a high one more likely.

What crash predictors really do

• Show past results dressed up as "signals".
• Guess. Low cash out targets hit most of the time anyway, so a predictor that always says 1.3x looks right often.
• Steal accounts. Extensions and apps that ask for your login, API key or a "verification" deposit are after your balance.
• Earn referral fees. Many signal channels are paid per sign-up through their link and earn more when you lose.

The maths you can rely on

With a 1% house edge, the chance a round reaches a multiplier of M is about 99% divided by M:

Whatever target you pick, you get back about 99% of what you bet over time. Aviator, made by Spribe, works differently and returns 97%; see our Aviator predictor guide.

Check a crash round yourself

1. Open the crash game's history and copy the hashes of two or more consecutive rounds.
2. Paste them, one per line and in order, into our hash chain check.
3. If every link matches, those rounds came from the pre-committed chain and could not have been changed after bets were placed.

Each casino's fairness page explains its exact crash formula and any salt it uses. Our fairness index shows which method each casino uses.

Red flags

• Asks for your login, API key or a browser extension.
• Claims "AI", "server access" or "leaked seeds".
• Shows only winning screenshots.
• Wants payment in crypto or gift cards, or only works through a sign-up link.

If you have shared your login with a predictor, change your password, turn on two-factor authentication and check your withdrawal address now.