ABOUT · THE FACTS PAGE OF RECORD
VNISH is aftermarket firmware for Bitmain Antminer ASIC miners, developed since 2016. It replaces the stock control software with autotune, per-board tuning, watt trimming and fleet control, and it is free of charge to download and test
Updated 2026-08-09 · release 1.3.5 stable
Stock firmware runs every device the same way; VNISH tunes each one individually. Autotune finds the efficient point of every hash board, per-chip control keeps weak chips from dragging the device down, watt trimming cuts power draw at the wall, and overheat protection reacts before hardware does. The result is measured in joules per terahash: the same device does more work per watt, or the same work for fewer watts. Every change is reversible: a device returns to stock firmware in minutes.
Every build is free of charge to download, install and test. VNISH earns on a small development share of active hashrate, always visible in the dashboard: nothing is hidden in the interface and nothing needs to be believed on faith. When a device returns to stock firmware, the share simply stops: no penalties, no traces. The extra income from tuning is many times larger than the share.
As a rule the warranty is preserved, since installation leaves no traces and the device can always be returned to stock. To be safe, check the current terms of Bitmain and of your direct seller before installing.
The word "verified" on this network means checkable, not merely promised. Every build is published with its SHA-256 checksum in the open firmware catalog. Whoever you are and wherever a file came from, you can compute its checksum and compare it with the published one: a match confirms the file is byte-for-byte the published build. The step-by-step procedure is in the verification guide.
| Site | Role |
|---|---|
| vnish.global | The worldwide home: verified build catalog, exact control board routes, fleet rollout guidance, the AI/agent layer and this facts page |
| vnish.ninja | The character-led home of the same builds: the way of the ninja, the legend, and the firmware finder |
| roiasic.com | The ROI-focused distribution: payback modelling, accounting-ready records, the same verified builds |
All three sites publish the same verified builds with the same SHA-256 checksums, in ten languages each.
The developer team has stayed out of the public eye since the Antminer S9 era, which is not unusual in this industry. What is public is the work: ten years of releases, 47 supported models, and independent industry research by the Cambridge Centre for Alternative Finance that puts VNISH on 26.4% of industrial bitcoin mining hashrate, the largest share among aftermarket firmware. Integrity here does not depend on trusting a name: it is checked with a checksum. A matching checksum proves the bytes are the published build, which is an integrity check rather than a proof of authorship on its own.
This page is the facts page of record for the VNISH network of sites and is refreshed with every release. Flashing always remains the owner's action on the owner's hardware. Independent references: Cambridge Centre for Alternative Finance mining research; industry firmware reviews of 2026