What Is a Bitaxe?
One chip, liberated
Lesson 1 opened the box on a full-size miner: hashboards carrying hundreds of chips, a control board, a power supply, fans. A Bitaxe is that same org chart with every department cut to one employee. One hashboard carrying one chip. An ESP32-S3 module — the class of chip that runs smart lightbulbs — as the control board, handling WiFi, power monitoring and the fan. A USB-C wall adapter standing in for the kilowatt power supply. One small fan. Nothing is simulated, and nothing is toy-grade where it counts: the current Bitaxe Gamma carries a BM1370, the same chip family Bitmain ships inside the Antminer S21 Pro (per the project’s own lineage table). It is a full-size miner at 1:200 scale, and that is exactly why it teaches.
The model lineage is named by chip, not by marketing: Max (BM1397, from the S17 era) → Ultra (BM1366, S19 XP) → Supra (BM1368, S21) → Gamma (BM1370, S21 Pro). Each newer chip pulls more drawers per joule. If a page quotes “the Bitaxe” at a few hundred gigahash, it is describing the 2023 Max/Ultra era — check the chip name. The current stock figures — 1.2 TH/s at 18 W, community-measured, since there is no manufacturer to publish a spec sheet — and every other spec row this page deliberately does not duplicate live on our Bitaxe rig page, dated and recomputed against the live network.
Two cousins get confused with it. NerdQAxe++ is an open derivative carrying several BM1370-class chips — a few times a Gamma’s pull. NerdMiner contains no ASIC at all: a bare ESP32 hashing in software at tens of kilohashes a second, roughly seven orders of magnitude below a Gamma — a lottery-themed desk ornament, not a miner. Sloppy coverage calls all of these “lottery miners” as if the odds were similar. They differ by a factor of about ten million.
“Open source” — and what that actually covers
The Bitaxe design was first published in early 2023 by a hardware engineer known as Skot, after years spent reverse-engineering Bitmain’s chips out of Antminer hashboards with oscilloscopes and logic analyzers. The hardware is licensed CERN-OHL-S 2.0 — schematics, board layout and bill of materials all public — and the firmware, ESP-Miner with its AxeOS web interface, is GPL-3.0. Anyone may build one, modify one or sell one, and many do; the project’s hub is the Open Source Miners United community, not a company.
One honest line most coverage never draws: the ASIC silicon itself is proprietary Bitmain. Nobody outside a chip fab audits the transistors. What is open is everything wrapped around the chip — the board that powers it, the firmware that drives it, the dashboard that reports on it. That is still a lot, and here is the receipt for why it matters: in April 2017 the Antbleed disclosure showed that Bitmain’s stock Antminer firmware contained a remotely triggerable shutdown backdoor — closed firmware, closed boards, and the owners were the last to know. On a Bitaxe, the code that talks to your pool and your WiFi is code anyone can read, and thousands have.
Three claims are honest, and one popular fourth is not. Honest: auditability (see above), repairability (a published schematic makes a dead board a soldering project instead of e-waste with a serial number), and cultural pressure toward open tooling in an industry that runs closed by default. Not honest: “home Bitaxes decentralize the network.” At one two-hundredth of one flagship’s hashrate per unit, their combined share of a thousand-exahash-class network is negligible — the honest claim is education, not network share. One more property that scares people unnecessarily: there is no warranty, because there is no manufacturer to void one. Support is the community; the DOA-and-repair downside is real and sits with you — it is priced into the rig page’s buy-decision checks.
Will it make money? The honest number
A stock Gamma pulls about 1.2 trillion drawers a second. The Bitcoin network pulls about a sextillion — 968.9 EH/s (fallback 2026-09-27), from our own node. The protocol pays exact pro-rata shares, so the division Module 1 ran for home mining in general lands, for this one device, here:
Income recomputed every minute from our node’s hashrate and block height; the subsidy is computed from the live height (3.125 BTC per block as of 2026 — it halves around April 2028, and this line will follow). Transaction fees and pool fees excluded.
Cents is the answer, and cents is not a flaw — it is the spec. At ordinary household electricity rates, the 0.432 kWh the chip and fan drink each day costs roughly what the drawer-pulling earns: a coin flip, decided by your own meter. Nobody buys a Bitaxe as an income stream, and anyone selling you one that way is describing a different object. The industry compresses a machine’s wage into one number, dollars per terahash per day, called hashprice — that page owns the number and its story. Whether this box ever pays for its own silicon is arithmetic we publish live on the rig page, against your own power rate, with today’s date on it — though at 56-odd sats a day, “payback period” stops being a meaningful number for this device. Run your own rate at the calculator if you want the general tool.
The lottery ticket, priced honestly
Point a Bitaxe at a pool and it earns the tile above, steadily. Point it at solo mining (glossary) and it earns nothing — until the round it wins an entire block, subsidy and fees, alone. Against today’s live network hashrate, the odds:
| Setup | TH/s | Odds per block | Expected wait |
|---|---|---|---|
| Stock Gamma | 1.2 | 1 in 807 million | ~15,400 years |
| Two Gammas, or one overclocked | 2.4 | 1 in 404 million | ~7,700 years |
| Six-unit cluster (block 887,212 class) | 3.3 | 1 in 294 million | ~5,600 years |
Live against our own node; static fallbacks dated 2026-09-27 (968.9 EH/s, height 968,878). Waits assume constant network hashrate — historically it grows, so real waits skew longer. A stock Gamma gets 144 chances a day: about 1 in 5.6 million per day.
Wins happen, and they are on-chain. On 2025-03-10, block 887,212 was solo-mined by a ~3.3 TH/s cluster of six Bitaxe units — 3.15 BTC, roughly a quarter-million dollars at the time, verified against the public chain by multiple independent trackers. Thirteen days later, block 889,975 was reported won by a stock, no-overclock Gamma — the exact 1-in-807-million row above, coming in. Read those two stories next to the table and both things are true at once: the lottery is real, and the trackers list only the winners. Nobody publishes the millions of Bitaxe-days that won nothing, which is precisely what “1 in 807 million per block” looks like from the inside. Survivorship bias does the selling; the arithmetic does the truth.
The doubling trap deserves one line: buy a second Gamma, or overclock into the next row, and the expected wait falls from ~15,400 years to ~7,700. Halving a geological timescale leaves a geological timescale — scale changes the number, never the category. The honest frame for solo mining a Bitaxe: a lottery ticket you can hold for years for pennies of electricity a day — a real ticket, never a plan.
Which of these is the true statement about Bitaxe solo odds?
What it is actually for
The Bitaxe needs no host computer. The onboard ESP32 joins your WiFi and serves its own dashboard — AxeOS, at http://bitaxe.local — where you point the device at any Stratum pool and then watch, on hardware you can hold: live hashrate, wall watts, chip temperature, and the best share it has ever found. Unlock the tuner and you get the frequency and core-voltage knobs; turn them and efficiency moves in real time. Every number in lesson 2 stops being a spec-sheet abstraction and becomes a thing your fingers change.
Run lesson 2’s method on it once: 18 W ÷ 1.2 TH/s = 15 J/TH, from two community-measured numbers. Against lesson 2’s dated band — ~13.5 J/TH flagship air, ~9.5 announced hydro, as of 2026-09 — a bookshelf object lands within two joules of the industrial flagships, because it is built from one of their chips. It is also this module’s quiet counterexample: one laptop-class fan (all Bitaxe noise reports are community-measured — no manufacturer, no dB spec) against the 75 dB class of full-size machines, where community reports run higher with worn fans and hot ambient. Lesson 4 owns that whole story.
So the honest job description: a spec-sheet decoder ring at 1:200 scale, with a lottery ticket stapled to it. The cheapest seat in this school — and the only machine in it you can audit down to the schematic.
The rig page reads 18 W at the wall and 1.2 TH/s. What is the Gamma’s efficiency, and where does that land?
FAQ
- Is a Bitaxe worth it? Will it make money?
- As income, no — a stock Gamma pool-mining earns on the order of 50-odd sats (a few cents) a day before electricity, and household power rates roughly cancel that; the live figure above carries today’s date. It is worth it as the only miner whose every schematic and line of firmware you can read, and as a years-long lottery ticket that costs pennies of electricity to hold. Buy it as a teacher, never as an investment.
- Can a Bitaxe really find a Bitcoin block on its own?
- It has happened and is on-chain: block 887,212 (March 10, 2025, a ~3.3 TH/s six-Bitaxe cluster, 3.15 BTC) and block 889,975 (March 23, 2025, reported as a stock Gamma). But at today’s network hashrate a stock Gamma’s odds are about 1 in 807 million per block — an expected wait measured in tens of thousands of years, computed live on this page. The wins are real; expecting one is the error.
- What is the difference between a Bitaxe and an Antminer?
- Category, not degree: one chip versus hundreds, 18 watts from a USB-C brick versus a ~3.5 kW appliance class, one near-silent fan versus a machine in the 75 dB class, open schematics with community support versus closed firmware with a factory warranty. The Gamma even runs the same BM1370 chip family as an S21 Pro — it is the industrial machine reduced to one legible unit.
- Do I need a computer to run one?
- No. The onboard ESP32 runs AxeOS: the Bitaxe joins your WiFi and serves its own web dashboard, where you set a pool, watch live hashrate, watts and chip temperature, and — once unlocked — tune frequency and voltage and watch J/TH move. That dashboard is most of the educational value.
- Why does open source matter in a miner?
- You can audit what the machine does. Closed stock firmware has a rap sheet — the 2017 Antbleed disclosure showed Antminer firmware contained a remotely triggerable shutdown backdoor. Open hardware and GPL firmware mean the schematic, the board and every line of code are checkable and repairable by anyone. One honest caveat: the ASIC silicon itself is still proprietary Bitmain — the openness is everything wrapped around the chip.