---
title: "Verify a Rollbit X-Crash bet: provably fair checker"
description: "Recompute a Rollbit X-Crash result from its random value or VRF proof with Rollbit's published algorithm. Runs in your browser; nothing is sent anywhere."
url: https://gambatracker.com/verify/rollbit/x-crash
rendered: 2026-11-11T13:28Z
---

[Verify](https://gambatracker.com/verify) / [Rollbit](https://gambatracker.com/verify/rollbit) / [X-Crash](https://gambatracker.com/verify/rollbit/x-crash)

# Rollbit X-Crash

Enter the random value or VRF proof from your bet's fairness details; the result is recomputed here with Rollbit's own published algorithm and every step is shown. Everything runs in your browser and nothing is sent anywhere.

VRF proof published output

## Where this comes from · algorithm, test vectors, notes

Algorithm Rollbit's own description or verifier: [rollbit.com](https://rollbit.com/x-crash/provably-fair). Scheme: VRF.

Test vectors: published output The page's VRF example (round 4,894,823) verifies; its outcome, 1.19x, and the sample randomness's 2.5x come from running the page's Python. Source: [rollbit.com](https://rollbit.com/x-crash/provably-fair).

Notes Rollbit lists X-Crash at 98% RTP elsewhere, but its published outcome code uses a 5% edge; the edge is an input.

Elsewhere [Rollbit's fairness page](https://rollbit.com/provably-fair) · [All Rollbit verifiers](https://gambatracker.com/verify/rollbit) · [How this site measures casinos](https://gambatracker.com/methodology)

**No result yet** Fill in the fields from your Rollbit bet and press Verify, or load the example to see the verifier agree with the casino’s own output.

18+

**A fair result is still a result with a house edge.** Passing a check here proves the casino did not change the outcome after the bet was placed. It does not mean the odds favour the player, and no check improves them. Gambling can be harmful.

[BeGambleAware](https://www.begambleaware.org/) [Help & limits](https://gambatracker.com/responsible-gambling)

How these figures are produced and labelled: https://gambatracker.com/llms.txt